In wptexturize(), don't convert C-style hexadecimals to mathematical ×.

Adds unit tests.

Props harrym, kurtpayne, miqrogroove.
Fixes #19308.


git-svn-id: https://develop.svn.wordpress.org/trunk@28719 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/formatting.php

@@ -180,10 +180,10 @@ function wptexturize($text) {
 			// regular expressions
 			$curl = preg_replace($dynamic_characters, $dynamic_replacements, $curl);
 
-			// 9x9 (times)
-			if ( 1 === preg_match( '/(?<=\d)x\d/', $text ) ) {
+			// 9x9 (times), but never 0x9999
+			if ( 1 === preg_match( '/(?<=\d)x-?\d/', $text ) ) {
 				// Searching for a digit is 10 times more expensive than for the x, so we avoid doing this one!
-				$curl = preg_replace( '/\b(\d+)x(\d+)\b/', '$1&#215;$2', $curl );
+				$curl = preg_replace( '/\b(\d(?(?<=0)[\d\.,]+|[\d\.,]*))x(-?\d[\d\.,]*)\b/', '$1&#215;$2', $curl );
 			}
 		}
 

tests/phpunit/tests/formatting/WPTexturize.php

@@ -780,10 +780,30 @@ class Tests_Formatting_WPTexturize extends WP_UnitTestCase {
 				"12x34",
 				"12×34",
 			),
+			array(
+				"-123x1=-123",
+				"-123×1=-123",
+			),
+			array(
+				"-123x-1",
+				"-123×-1",
+			),
+			array(
+				"0.675x1=0.675",
+				"0.675×1=0.675",
+			),
 			array(
 				"9 x 9",
 				"9 x 9",
 			),
+			array(
+				"0x70",
+				"0x70",
+			),
+			array(
+				"3x2x1x0",
+				"3x2x1x0",
+			),
 		);
 	}