Adding example connector.

composer.json

@@ -0,0 +1,17 @@
+{
+    "name": "sergio/exec_libvips_php",
+    "type": "library",
+    "license": "proprietary",
+    "autoload": {
+        "psr-4": {
+            "Sergio\\ExecLibvipsPhp\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Sergiotarxz",
+            "email": "sergiotarxz@posteo.net"
+        }
+    ],
+    "require": {}
+}

composer.lock

@@ -0,0 +1,18 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "2b1115d0fe6887ac144d9b0248d72ced",
+    "packages": [],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": [],
+    "plugin-api-version": "2.1.0"
+}

src/index.php

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+<?php
+namespace Sergio\ExecLibvipsPhp;
+use Exception;
+
+function transform(string $socketLocation, string $inputFile, string $outputFile,
+    int $cyan, int $magenta, int $yellow, int $black, int $blackType,
+    int $colorType): array {
+    $socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
+    if ($socket === false) {
+        throw new Exception(socket_last_error());
+    }
+    if(socket_connect($socket, $socketLocation) === false) {
+        throw new Exception("Unable to connect to specified socket location $socketLocation");
+    }
+    $json = json_encode([
+        "input_file" => $inputFile,
+        "output_file" => $outputFile,
+        "cyan" => $cyan,
+        "magenta" => $magenta,
+        "black" => $black,
+        "yellow" => $yellow,
+        "colorType" => $colorType,
+        "blackType" => $blackType,
+    ]);
+    $json_len = strlen($json);
+    socket_write($socket, pack("J", $json_len), 8);
+    socket_write($socket, $json, $json_len);
+    $json_len = "";
+    socket_recv($socket, $json_len, 8, MSG_WAITALL);
+    $json_len = unpack("J", $json_len)[1];
+    $json = "";
+    socket_recv($socket, $json, $json_len, MSG_WAITALL);
+    $json = json_decode($json, true);
+    var_dump($json);
+    return $json;
+}