diff --git a/src/wp-admin/includes/image.php b/src/wp-admin/includes/image.php
index 2ebcad1d86..f9108091fc 100644
--- a/src/wp-admin/includes/image.php
+++ b/src/wp-admin/includes/image.php
@@ -638,9 +638,9 @@ function wp_exif_frac2dec( $str ) {
 		return $str;
 	}
 
-	list( $n, $d ) = explode( '/', $str );
-	if ( ! empty( $d ) ) {
-		return $n / $d;
+	list( $numerator, $denominator ) = explode( '/', $str );
+	if ( ! empty( $denominator ) ) {
+		return $numerator / $denominator;
 	}
 	return $str;
 }
diff --git a/src/wp-includes/comment-template.php b/src/wp-includes/comment-template.php
index f19264b29f..ad61a63e11 100644
--- a/src/wp-includes/comment-template.php
+++ b/src/wp-includes/comment-template.php
@@ -543,17 +543,17 @@ function get_comment_class( $class = '', $comment_id = null, $post_id = null ) {
  * @since 1.5.0
  * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
  *
- * @param string          $d          Optional. The format of the date. Default user's setting.
+ * @param string          $format     Optional. The format of the date. Default user's setting.
  * @param int|WP_Comment  $comment_ID WP_Comment or ID of the comment for which to get the date.
  *                                    Default current comment.
  * @return string The comment's date.
  */
-function get_comment_date( $d = '', $comment_ID = 0 ) {
+function get_comment_date( $format = '', $comment_ID = 0 ) {
 	$comment = get_comment( $comment_ID );
-	if ( '' == $d ) {
+	if ( '' == $format ) {
 		$date = mysql2date( get_option( 'date_format' ), $comment->comment_date );
 	} else {
-		$date = mysql2date( $d, $comment->comment_date );
+		$date = mysql2date( $format, $comment->comment_date );
 	}
 	/**
 	 * Filters the returned comment date.
@@ -561,10 +561,10 @@ function get_comment_date( $d = '', $comment_ID = 0 ) {
 	 * @since 1.5.0
 	 *
 	 * @param string|int $date    Formatted date string or Unix timestamp.
-	 * @param string     $d       The format of the date.
+	 * @param string     $format  The format of the date.
 	 * @param WP_Comment $comment The comment object.
 	 */
-	return apply_filters( 'get_comment_date', $date, $d, $comment );
+	return apply_filters( 'get_comment_date', $date, $format, $comment );
 }
 
 /**
@@ -573,12 +573,12 @@ function get_comment_date( $d = '', $comment_ID = 0 ) {
  * @since 0.71
  * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
  *
- * @param string         $d          Optional. The format of the date. Default user's settings.
+ * @param string         $format     Optional. The format of the date. Default user's settings.
  * @param int|WP_Comment $comment_ID WP_Comment or ID of the comment for which to print the date.
  *                                   Default current comment.
  */
-function comment_date( $d = '', $comment_ID = 0 ) {
-	echo get_comment_date( $d, $comment_ID );
+function comment_date( $format = '', $comment_ID = 0 ) {
+	echo get_comment_date( $format, $comment_ID );
 }
 
 /**
@@ -1031,20 +1031,20 @@ function comment_text( $comment_ID = 0, $args = array() ) {
  *
  * @since 1.5.0
  *
- * @param string $d         Optional. The format of the time. Default user's settings.
+ * @param string $format    Optional. The format of the time. Default user's settings.
  * @param bool   $gmt       Optional. Whether to use the GMT date. Default false.
  * @param bool   $translate Optional. Whether to translate the time (for use in feeds).
  *                          Default true.
  * @return string The formatted time.
  */
-function get_comment_time( $d = '', $gmt = false, $translate = true ) {
+function get_comment_time( $format = '', $gmt = false, $translate = true ) {
 	$comment = get_comment();
 
 	$comment_date = $gmt ? $comment->comment_date_gmt : $comment->comment_date;
-	if ( '' == $d ) {
+	if ( '' == $format ) {
 		$date = mysql2date( get_option( 'time_format' ), $comment_date, $translate );
 	} else {
-		$date = mysql2date( $d, $comment_date, $translate );
+		$date = mysql2date( $format, $comment_date, $translate );
 	}
 
 	/**
@@ -1053,12 +1053,12 @@ function get_comment_time( $d = '', $gmt = false, $translate = true ) {
 	 * @since 1.5.0
 	 *
 	 * @param string|int $date      The comment time, formatted as a date string or Unix timestamp.
-	 * @param string     $d         Date format.
+	 * @param string     $format    Date format.
 	 * @param bool       $gmt       Whether the GMT date is in use.
 	 * @param bool       $translate Whether the time is translated.
 	 * @param WP_Comment $comment   The comment object.
 	 */
-	return apply_filters( 'get_comment_time', $date, $d, $gmt, $translate, $comment );
+	return apply_filters( 'get_comment_time', $date, $format, $gmt, $translate, $comment );
 }
 
 /**
@@ -1066,10 +1066,10 @@ function get_comment_time( $d = '', $gmt = false, $translate = true ) {
  *
  * @since 0.71
  *
- * @param string $d Optional. The format of the time. Default user's settings.
+ * @param string $format Optional. The format of the time. Default user's settings.
  */
-function comment_time( $d = '' ) {
-	echo get_comment_time( $d );
+function comment_time( $format = '' ) {
+	echo get_comment_time( $format );
 }
 
 /**
diff --git a/src/wp-includes/general-template.php b/src/wp-includes/general-template.php
index a2aa63b017..96917c7c59 100644
--- a/src/wp-includes/general-template.php
+++ b/src/wp-includes/general-template.php
@@ -2344,19 +2344,19 @@ function the_date_xml() {
  * @global string $currentday  The day of the current post in the loop.
  * @global string $previousday The day of the previous post in the loop.
  *
- * @param string $d      Optional. PHP date format defaults to the date_format option if not specified.
+ * @param string $format Optional. PHP date format defaults to the date_format option if not specified.
  * @param string $before Optional. Output before the date.
  * @param string $after  Optional. Output after the date.
  * @param bool   $echo   Optional, default is display. Whether to echo the date or return it.
  * @return string|void String if retrieving.
  */
-function the_date( $d = '', $before = '', $after = '', $echo = true ) {
+function the_date( $format = '', $before = '', $after = '', $echo = true ) {
 	global $currentday, $previousday;
 
 	$the_date = '';
 
 	if ( is_new_day() ) {
-		$the_date    = $before . get_the_date( $d ) . $after;
+		$the_date    = $before . get_the_date( $format ) . $after;
 		$previousday = $currentday;
 	}
 
@@ -2366,12 +2366,12 @@ function the_date( $d = '', $before = '', $after = '', $echo = true ) {
 	 * @since 0.71
 	 *
 	 * @param string $the_date The formatted date string.
-	 * @param string $d        PHP date format. Defaults to 'date_format' option
+	 * @param string $format   PHP date format. Defaults to 'date_format' option
 	 *                         if not specified.
 	 * @param string $before   HTML output before the date.
 	 * @param string $after    HTML output after the date.
 	 */
-	$the_date = apply_filters( 'the_date', $the_date, $d, $before, $after );
+	$the_date = apply_filters( 'the_date', $the_date, $format, $before, $after );
 
 	if ( $echo ) {
 		echo $the_date;
@@ -2388,21 +2388,21 @@ function the_date( $d = '', $before = '', $after = '', $echo = true ) {
  *
  * @since 3.0.0
  *
- * @param  string      $d    Optional. PHP date format defaults to the date_format option if not specified.
- * @param  int|WP_Post $post Optional. Post ID or WP_Post object. Default current post.
+ * @param  string      $format Optional. PHP date format defaults to the date_format option if not specified.
+ * @param  int|WP_Post $post   Optional. Post ID or WP_Post object. Default current post.
  * @return string|false Date the current post was written. False on failure.
  */
-function get_the_date( $d = '', $post = null ) {
+function get_the_date( $format = '', $post = null ) {
 	$post = get_post( $post );
 
 	if ( ! $post ) {
 		return false;
 	}
 
-	if ( '' == $d ) {
+	if ( '' == $format ) {
 		$the_date = get_post_time( get_option( 'date_format' ), false, $post, true );
 	} else {
-		$the_date = get_post_time( $d, false, $post, true );
+		$the_date = get_post_time( $format, false, $post, true );
 	}
 
 	/**
@@ -2411,11 +2411,11 @@ function get_the_date( $d = '', $post = null ) {
 	 * @since 3.0.0
 	 *
 	 * @param string      $the_date The formatted date.
-	 * @param string      $d        PHP date format. Defaults to 'date_format' option
+	 * @param string      $format   PHP date format. Defaults to 'date_format' option
 	 *                              if not specified.
 	 * @param int|WP_Post $post     The post object or ID.
 	 */
-	return apply_filters( 'get_the_date', $the_date, $d, $post );
+	return apply_filters( 'get_the_date', $the_date, $format, $post );
 }
 
 /**
@@ -2423,14 +2423,14 @@ function get_the_date( $d = '', $post = null ) {
  *
  * @since 2.1.0
  *
- * @param string $d      Optional. PHP date format defaults to the date_format option if not specified.
+ * @param string $format Optional. PHP date format defaults to the date_format option if not specified.
  * @param string $before Optional. Output before the date.
  * @param string $after  Optional. Output after the date.
  * @param bool   $echo   Optional, default is display. Whether to echo the date or return it.
  * @return string|void String if retrieving.
  */
-function the_modified_date( $d = '', $before = '', $after = '', $echo = true ) {
-	$the_modified_date = $before . get_the_modified_date( $d ) . $after;
+function the_modified_date( $format = '', $before = '', $after = '', $echo = true ) {
+	$the_modified_date = $before . get_the_modified_date( $format ) . $after;
 
 	/**
 	 * Filters the date a post was last modified for display.
@@ -2438,12 +2438,12 @@ function the_modified_date( $d = '', $before = '', $after = '', $echo = true ) {
 	 * @since 2.1.0
 	 *
 	 * @param string $the_modified_date The last modified date.
-	 * @param string $d                 PHP date format. Defaults to 'date_format' option
+	 * @param string $format            PHP date format. Defaults to 'date_format' option
 	 *                                  if not specified.
 	 * @param string $before            HTML output before the date.
 	 * @param string $after             HTML output after the date.
 	 */
-	$the_modified_date = apply_filters( 'the_modified_date', $the_modified_date, $d, $before, $after );
+	$the_modified_date = apply_filters( 'the_modified_date', $the_modified_date, $format, $before, $after );
 
 	if ( $echo ) {
 		echo $the_modified_date;
@@ -2459,20 +2459,20 @@ function the_modified_date( $d = '', $before = '', $after = '', $echo = true ) {
  * @since 2.1.0
  * @since 4.6.0 Added the `$post` parameter.
  *
- * @param string      $d    Optional. PHP date format defaults to the date_format option if not specified.
- * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default current post.
+ * @param string      $format Optional. PHP date format defaults to the date_format option if not specified.
+ * @param int|WP_Post $post   Optional. Post ID or WP_Post object. Default current post.
  * @return string|false Date the current post was modified. False on failure.
  */
-function get_the_modified_date( $d = '', $post = null ) {
+function get_the_modified_date( $format = '', $post = null ) {
 	$post = get_post( $post );
 
 	if ( ! $post ) {
 		// For backward compatibility, failures go through the filter below.
 		$the_time = false;
-	} elseif ( empty( $d ) ) {
+	} elseif ( empty( $format ) ) {
 		$the_time = get_post_modified_time( get_option( 'date_format' ), false, $post, true );
 	} else {
-		$the_time = get_post_modified_time( $d, false, $post, true );
+		$the_time = get_post_modified_time( $format, false, $post, true );
 	}
 
 	/**
@@ -2482,11 +2482,11 @@ function get_the_modified_date( $d = '', $post = null ) {
 	 * @since 4.6.0 Added the `$post` parameter.
 	 *
 	 * @param string|bool  $the_time The formatted date or false if no post is found.
-	 * @param string       $d        PHP date format. Defaults to value specified in
+	 * @param string       $format   PHP date format. Defaults to value specified in
 	 *                               'date_format' option.
 	 * @param WP_Post|null $post     WP_Post object or null if no post is found.
 	 */
-	return apply_filters( 'get_the_modified_date', $the_time, $d, $post );
+	return apply_filters( 'get_the_modified_date', $the_time, $format, $post );
 }
 
 /**
@@ -2494,19 +2494,19 @@ function get_the_modified_date( $d = '', $post = null ) {
  *
  * @since 0.71
  *
- * @param string $d Either 'G', 'U', or php date format.
+ * @param string $format Either 'G', 'U', or PHP date format.
  */
-function the_time( $d = '' ) {
+function the_time( $format = '' ) {
 	/**
 	 * Filters the time a post was written for display.
 	 *
 	 * @since 0.71
 	 *
 	 * @param string $get_the_time The formatted time.
-	 * @param string $d            The time format. Accepts 'G', 'U',
-	 *                             or php date format.
+	 * @param string $format       The time format. Accepts 'G', 'U',
+	 *                             or PHP date format.
 	 */
-	echo apply_filters( 'the_time', get_the_time( $d ), $d );
+	echo apply_filters( 'the_time', get_the_time( $format ), $format );
 }
 
 /**
@@ -2514,23 +2514,24 @@ function the_time( $d = '' ) {
  *
  * @since 1.5.0
  *
- * @param string      $d    Optional. Format to use for retrieving the time the post
- *                          was written. Either 'G', 'U', or php date format defaults
- *                          to the value specified in the time_format option. Default empty.
- * @param int|WP_Post $post WP_Post object or ID. Default is global `$post` object.
- * @return string|int|false Formatted date string or Unix timestamp if `$d` is 'U' or 'G'. False on failure.
+ * @param string      $format Optional. Format to use for retrieving the time the post
+ *                            was written. Either 'G', 'U', or PHP date format defaults
+ *                            to the value specified in the time_format option. Default empty.
+ * @param int|WP_Post $post   WP_Post object or ID. Default is global `$post` object.
+ * @return string|int|false Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
+ *                          False on failure.
  */
-function get_the_time( $d = '', $post = null ) {
+function get_the_time( $format = '', $post = null ) {
 	$post = get_post( $post );
 
 	if ( ! $post ) {
 		return false;
 	}
 
-	if ( '' == $d ) {
+	if ( '' == $format ) {
 		$the_time = get_post_time( get_option( 'time_format' ), false, $post, true );
 	} else {
-		$the_time = get_post_time( $d, false, $post, true );
+		$the_time = get_post_time( $format, false, $post, true );
 	}
 
 	/**
@@ -2539,12 +2540,12 @@ function get_the_time( $d = '', $post = null ) {
 	 * @since 1.5.0
 	 *
 	 * @param string      $the_time The formatted time.
-	 * @param string      $d        Format to use for retrieving the time the post was written.
-	 *                              Accepts 'G', 'U', or php date format value specified
+	 * @param string      $format   Format to use for retrieving the time the post was written.
+	 *                              Accepts 'G', 'U', or PHP date format value specified
 	 *                              in 'time_format' option. Default empty.
 	 * @param int|WP_Post $post     WP_Post object or ID.
 	 */
-	return apply_filters( 'get_the_time', $the_time, $d, $post );
+	return apply_filters( 'get_the_time', $the_time, $format, $post );
 }
 
 /**
@@ -2552,14 +2553,15 @@ function get_the_time( $d = '', $post = null ) {
  *
  * @since 2.0.0
  *
- * @param string      $d         Optional. Format to use for retrieving the time the post
- *                               was written. Either 'G', 'U', or php date format. Default 'U'.
+ * @param string      $format    Optional. Format to use for retrieving the time the post
+ *                               was written. Either 'G', 'U', or PHP date format. Default 'U'.
  * @param bool        $gmt       Optional. Whether to retrieve the GMT time. Default false.
  * @param int|WP_Post $post      WP_Post object or ID. Default is global `$post` object.
  * @param bool        $translate Whether to translate the time string. Default false.
- * @return string|int|false Formatted date string or Unix timestamp if `$d` is 'U' or 'G'. False on failure.
+ * @return string|int|false Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
+ *                          False on failure.
  */
-function get_post_time( $d = 'U', $gmt = false, $post = null, $translate = false ) {
+function get_post_time( $format = 'U', $gmt = false, $post = null, $translate = false ) {
 	$post = get_post( $post );
 
 	if ( ! $post ) {
@@ -2573,7 +2575,7 @@ function get_post_time( $d = 'U', $gmt = false, $post = null, $translate = false
 		return false;
 	}
 
-	if ( 'U' === $d || 'G' === $d ) {
+	if ( 'U' === $format || 'G' === $format ) {
 		$time = $datetime->getTimestamp();
 
 		// Returns a sum of timestamp with timezone offset. Ideally should never be used.
@@ -2581,13 +2583,13 @@ function get_post_time( $d = 'U', $gmt = false, $post = null, $translate = false
 			$time += $datetime->getOffset();
 		}
 	} elseif ( $translate ) {
-		$time = wp_date( $d, $datetime->getTimestamp(), $gmt ? new DateTimeZone( 'UTC' ) : null );
+		$time = wp_date( $format, $datetime->getTimestamp(), $gmt ? new DateTimeZone( 'UTC' ) : null );
 	} else {
 		if ( $gmt ) {
 			$datetime = $datetime->setTimezone( new DateTimeZone( 'UTC' ) );
 		}
 
-		$time = $datetime->format( $d );
+		$time = $datetime->format( $format );
 	}
 
 	/**
@@ -2595,12 +2597,12 @@ function get_post_time( $d = 'U', $gmt = false, $post = null, $translate = false
 	 *
 	 * @since 2.6.0
 	 *
-	 * @param string $time The formatted time.
-	 * @param string $d    Format to use for retrieving the time the post was written.
-	 *                     Accepts 'G', 'U', or php date format. Default 'U'.
-	 * @param bool   $gmt  Whether to retrieve the GMT time. Default false.
+	 * @param string $time   The formatted time.
+	 * @param string $format Format to use for retrieving the time the post was written.
+	 *                       Accepts 'G', 'U', or PHP date format. Default 'U'.
+	 * @param bool   $gmt    Whether to retrieve the GMT time. Default false.
 	 */
-	return apply_filters( 'get_post_time', $time, $d, $gmt );
+	return apply_filters( 'get_post_time', $time, $format, $gmt );
 }
 
 /**
@@ -2680,20 +2682,21 @@ function get_post_timestamp( $post = null, $field = 'date' ) {
  *
  * @since 2.0.0
  *
- * @param string $d Optional Either 'G', 'U', or php date format defaults to the value specified in the time_format option.
+ * @param string $format Optional. Either 'G', 'U', or PHP date format defaults
+ *                       to the value specified in the time_format option.
  */
-function the_modified_time( $d = '' ) {
+function the_modified_time( $format = '' ) {
 	/**
 	 * Filters the localized time a post was last modified, for display.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param string $get_the_modified_time The formatted time.
-	 * @param string $d                     The time format. Accepts 'G', 'U',
-	 *                                      or php date format. Defaults to value
+	 * @param string $format                The time format. Accepts 'G', 'U',
+	 *                                      or PHP date format. Defaults to value
 	 *                                      specified in 'time_format' option.
 	 */
-	echo apply_filters( 'the_modified_time', get_the_modified_time( $d ), $d );
+	echo apply_filters( 'the_modified_time', get_the_modified_time( $format ), $format );
 }
 
 /**
@@ -2702,22 +2705,22 @@ function the_modified_time( $d = '' ) {
  * @since 2.0.0
  * @since 4.6.0 Added the `$post` parameter.
  *
- * @param string      $d     Optional. Format to use for retrieving the time the post
- *                           was modified. Either 'G', 'U', or php date format defaults
- *                           to the value specified in the time_format option. Default empty.
- * @param int|WP_Post $post  Optional. Post ID or WP_Post object. Default current post.
+ * @param string      $format Optional. Format to use for retrieving the time the post
+ *                            was modified. Either 'G', 'U', or PHP date format defaults
+ *                            to the value specified in the time_format option. Default empty.
+ * @param int|WP_Post $post   Optional. Post ID or WP_Post object. Default current post.
  * @return string|false Formatted date string or Unix timestamp. False on failure.
  */
-function get_the_modified_time( $d = '', $post = null ) {
+function get_the_modified_time( $format = '', $post = null ) {
 	$post = get_post( $post );
 
 	if ( ! $post ) {
 		// For backward compatibility, failures go through the filter below.
 		$the_time = false;
-	} elseif ( empty( $d ) ) {
+	} elseif ( empty( $format ) ) {
 		$the_time = get_post_modified_time( get_option( 'time_format' ), false, $post, true );
 	} else {
-		$the_time = get_post_modified_time( $d, false, $post, true );
+		$the_time = get_post_modified_time( $format, false, $post, true );
 	}
 
 	/**
@@ -2727,12 +2730,12 @@ function get_the_modified_time( $d = '', $post = null ) {
 	 * @since 4.6.0 Added the `$post` parameter.
 	 *
 	 * @param string|bool  $the_time The formatted time or false if no post is found.
-	 * @param string       $d        Format to use for retrieving the time the post was
-	 *                               written. Accepts 'G', 'U', or php date format. Defaults
+	 * @param string       $format   Format to use for retrieving the time the post was
+	 *                               written. Accepts 'G', 'U', or PHP date format. Defaults
 	 *                               to value specified in 'time_format' option.
 	 * @param WP_Post|null $post     WP_Post object or null if no post is found.
 	 */
-	return apply_filters( 'get_the_modified_time', $the_time, $d, $post );
+	return apply_filters( 'get_the_modified_time', $the_time, $format, $post );
 }
 
 /**
@@ -2740,14 +2743,15 @@ function get_the_modified_time( $d = '', $post = null ) {
  *
  * @since 2.0.0
  *
- * @param string      $d         Optional. Format to use for retrieving the time the post
- *                               was modified. Either 'G', 'U', or php date format. Default 'U'.
+ * @param string      $format    Optional. Format to use for retrieving the time the post
+ *                               was modified. Either 'G', 'U', or PHP date format. Default 'U'.
  * @param bool        $gmt       Optional. Whether to retrieve the GMT time. Default false.
  * @param int|WP_Post $post      WP_Post object or ID. Default is global `$post` object.
  * @param bool        $translate Whether to translate the time string. Default false.
- * @return string|int|false Formatted date string or Unix timestamp if `$d` is 'U' or 'G'. False on failure.
+ * @return string|int|false Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
+ *                          False on failure.
  */
-function get_post_modified_time( $d = 'U', $gmt = false, $post = null, $translate = false ) {
+function get_post_modified_time( $format = 'U', $gmt = false, $post = null, $translate = false ) {
 	$post = get_post( $post );
 
 	if ( ! $post ) {
@@ -2761,7 +2765,7 @@ function get_post_modified_time( $d = 'U', $gmt = false, $post = null, $translat
 		return false;
 	}
 
-	if ( 'U' === $d || 'G' === $d ) {
+	if ( 'U' === $format || 'G' === $format ) {
 		$time = $datetime->getTimestamp();
 
 		// Returns a sum of timestamp with timezone offset. Ideally should never be used.
@@ -2769,13 +2773,13 @@ function get_post_modified_time( $d = 'U', $gmt = false, $post = null, $translat
 			$time += $datetime->getOffset();
 		}
 	} elseif ( $translate ) {
-		$time = wp_date( $d, $datetime->getTimestamp(), $gmt ? new DateTimeZone( 'UTC' ) : null );
+		$time = wp_date( $format, $datetime->getTimestamp(), $gmt ? new DateTimeZone( 'UTC' ) : null );
 	} else {
 		if ( $gmt ) {
 			$datetime = $datetime->setTimezone( new DateTimeZone( 'UTC' ) );
 		}
 
-		$time = $datetime->format( $d );
+		$time = $datetime->format( $format );
 	}
 
 	/**
@@ -2783,12 +2787,12 @@ function get_post_modified_time( $d = 'U', $gmt = false, $post = null, $translat
 	 *
 	 * @since 2.8.0
 	 *
-	 * @param string $time The formatted time.
-	 * @param string $d    Format to use for retrieving the time the post was modified.
-	 *                     Accepts 'G', 'U', or php date format. Default 'U'.
-	 * @param bool   $gmt  Whether to retrieve the GMT time. Default false.
+	 * @param string $time   The formatted time.
+	 * @param string $format Format to use for retrieving the time the post was modified.
+	 *                       Accepts 'G', 'U', or PHP date format. Default 'U'.
+	 * @param bool   $gmt    Whether to retrieve the GMT time. Default false.
 	 */
-	return apply_filters( 'get_post_modified_time', $time, $d, $gmt );
+	return apply_filters( 'get_post_modified_time', $time, $format, $gmt );
 }
 
 /**
diff --git a/src/wp-includes/widgets/class-wp-widget-archives.php b/src/wp-includes/widgets/class-wp-widget-archives.php
index 4767f673f4..7df65d9335 100644
--- a/src/wp-includes/widgets/class-wp-widget-archives.php
+++ b/src/wp-includes/widgets/class-wp-widget-archives.php
@@ -45,8 +45,8 @@ class WP_Widget_Archives extends WP_Widget {
 		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
 		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
 
-		$c = ! empty( $instance['count'] ) ? '1' : '0';
-		$d = ! empty( $instance['dropdown'] ) ? '1' : '0';
+		$count    = ! empty( $instance['count'] ) ? '1' : '0';
+		$dropdown = ! empty( $instance['dropdown'] ) ? '1' : '0';
 
 		echo $args['before_widget'];
 
@@ -54,7 +54,7 @@ class WP_Widget_Archives extends WP_Widget {
 			echo $args['before_title'] . $title . $args['after_title'];
 		}
 
-		if ( $d ) {
+		if ( $dropdown ) {
 			$dropdown_id = "{$this->id_base}-dropdown-{$this->number}";
 			?>
 		<label class="screen-reader-text" for="<?php echo esc_attr( $dropdown_id ); ?>"><?php echo $title; ?></label>
@@ -76,7 +76,7 @@ class WP_Widget_Archives extends WP_Widget {
 				array(
 					'type'            => 'monthly',
 					'format'          => 'option',
-					'show_post_count' => $c,
+					'show_post_count' => $count,
 				),
 				$instance
 			);
@@ -140,7 +140,7 @@ class WP_Widget_Archives extends WP_Widget {
 					'widget_archives_args',
 					array(
 						'type'            => 'monthly',
-						'show_post_count' => $c,
+						'show_post_count' => $count,
 					),
 					$instance
 				)
diff --git a/src/wp-includes/widgets/class-wp-widget-categories.php b/src/wp-includes/widgets/class-wp-widget-categories.php
index 64959b3a2a..4dfbdae1f3 100644
--- a/src/wp-includes/widgets/class-wp-widget-categories.php
+++ b/src/wp-includes/widgets/class-wp-widget-categories.php
@@ -49,9 +49,9 @@ class WP_Widget_Categories extends WP_Widget {
 		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
 		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
 
-		$c = ! empty( $instance['count'] ) ? '1' : '0';
-		$h = ! empty( $instance['hierarchical'] ) ? '1' : '0';
-		$d = ! empty( $instance['dropdown'] ) ? '1' : '0';
+		$count        = ! empty( $instance['count'] ) ? '1' : '0';
+		$hierarchical = ! empty( $instance['hierarchical'] ) ? '1' : '0';
+		$dropdown     = ! empty( $instance['dropdown'] ) ? '1' : '0';
 
 		echo $args['before_widget'];
 
@@ -61,11 +61,11 @@ class WP_Widget_Categories extends WP_Widget {
 
 		$cat_args = array(
 			'orderby'      => 'name',
-			'show_count'   => $c,
-			'hierarchical' => $h,
+			'show_count'   => $count,
+			'hierarchical' => $hierarchical,
 		);
 
-		if ( $d ) {
+		if ( $dropdown ) {
 			echo sprintf( '<form action="%s" method="get">', esc_url( home_url() ) );
 			$dropdown_id    = ( $first_dropdown ) ? 'cat' : "{$this->id_base}-dropdown-{$this->number}";
 			$first_dropdown = false;