Add phpcs dependency

Author: SerafimArts

composer.json

@@ -31,7 +31,8 @@
     },
     "require-dev": {
         "vimeo/psalm": "^5.4",
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^9.5",
+        "squizlabs/php_codesniffer": "^3.7"
     },
     "autoload-dev": {
         "psr-4": {

phpcs.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0"?>
+<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Code Style Ruleset">
+    <!-- config -->
+    <rule ref="PSR12">
+        <exclude name="PSR12.Classes.AnonClassDeclaration"/>
+    </rule>
+    <rule ref="Generic.PHP.ForbiddenFunctions">
+        <properties>
+            <property name="forbiddenFunctions" type="array" extend="true">
+                <!-- deprecated/aliased functions -->
+                <element key="join" value="implode" />
+                <element key="chop" value="rtrim" />
+                <element key="strchr" value="strstr" />
+                <element key="show_source" value="highlight_file" />
+                <element key="ini_alter" value="ini_set" />
+                <element key="dns_check_record" value="checkdnsrr" />
+                <element key="dns_get_mx" value="getmxrr" />
+                <element key="doubleval" value="floatval" />
+                <element key="is_long" value="is_int" />
+                <element key="is_integer" value="is_int" />
+                <element key="is_double" value="is_float" />
+                <element key="is_real" value="is_float" />
+                <element key="fputs" value="fwrite" />
+                <element key="set_file_buffer" value="stream_set_write_buffer" />
+                <element key="set_socket_blocking" value="stream_set_blocking" />
+                <element key="socket_set_blocking" value="stream_set_blocking" />
+                <element key="stream_register_wrapper" value="stream_wrapper_register" />
+                <element key="socket_set_timeout" value="stream_set_timeout" />
+                <element key="socket_get_status" value="stream_get_meta_data" />
+                <element key="is_writeable" value="is_writable" />
+                <element key="pos" value="current" />
+                <element key="sizeof" value="count" />
+
+                <!-- deprecated/aliased operators -->
+                <element key="delete" value="unset" />
+                <element key="print" value="echo" />
+                <element key="create_function" value="null" />
+            </property>
+        </properties>
+    </rule>
+
+    <arg name="colors"/>
+
+    <!-- includes -->
+    <file>./src</file>
+
+    <!-- excludes -->
+    <exclude-pattern type="relative">*/tests/*</exclude-pattern>
+</ruleset>