Updated documentation for ext-redis usage.

Author: TheLevti

README.md

@@ -25,6 +25,8 @@ php-lock/lock follows semantic versioning. Read more on [semver.org][1].
  - Optionally the [php-pcntl][3] extension to enable locking with `flock()` without
    busy waiting in CLI scripts.
  - Optionally `flock()`, `ext-redis`, `ext-pdo_mysql`, `ext-pdo_sqlite`, `ext-pdo_pgsql` or `ext-memcached` can be used as a backend for locks. See examples below.
+ - If `ext-redis` is used for locking and is configured to use igbinary for serialization or
+   lzf for compression, additionally `ext-igbinary` and/or `ext-lzf` have to be installed.
 
 ----
 

classes/mutex/PHPRedisMutex.php

@@ -72,7 +72,7 @@ protected function evalScript($redis, string $script, int $numkeys, array $argum
         // Determine if we need to compress eval arguments.
         $lzfCompression = false;
         if (defined("Redis::COMPRESSION_LZF") &&
-            constant("Redis::COMPRESSION_LZF") === $redis->getOption(Redis::OPT_COMPRESSION) &&
+            Redis::COMPRESSION_LZF === $redis->getOption(Redis::OPT_COMPRESSION) &&
             function_exists('lzf_compress')
         ) {
             $lzfCompression = true;

composer.json

@@ -46,6 +46,7 @@
         "psr/log": "^1"
     },
     "require-dev": {
+        "ext-igbinary": "*",
         "ext-lzf": "*",
         "ext-memcached": "*",
         "ext-pcntl": "*",
@@ -63,6 +64,7 @@
         "squizlabs/php_codesniffer": "^3.3"
     },
     "suggest": {
+        "ext-igbinary": "To use this library with PHP Redis igbinary serializer enabled.",
         "ext-lzf": "To use this library with PHP Redis lzf compression enabled.",
         "ext-pnctl": "Enables locking with flock without busy waiting in CLI scripts.",
         "ext-redis": "To use this library with the PHP Redis extension.",