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wp-content/plugins/official-facebook-pixel/integration/class-facebookwordpressintegrationbase.php

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+<?php
+/**
+ * Facebook Pixel Plugin FacebookWordpressIntegrationBase class.
+ *
+ * This file contains the main logic for FacebookWordpressIntegrationBase.
+ *
+ * @package FacebookPixelPlugin
+ */
+
+/**
+ * Define FacebookWordpressIntegrationBase class.
+ *
+ * @return void
+ */
+
+/*
+* Copyright (C) 2017-present, Meta, Inc.
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; version 2 of the License.
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+namespace FacebookPixelPlugin\Integration;
+
+defined( 'ABSPATH' ) || die( 'Direct access not allowed' );
+
+use ReflectionMethod;
+
+/**
+ * FacebookWordpressIntegrationBase class.
+ */
+abstract class FacebookWordpressIntegrationBase {
+    const PLUGIN_FILE   = '';
+    const TRACKING_NAME = '';
+
+
+    /**
+     * This function should be overridden in derived classes.
+     * It is responsible for adding action hooks to
+     * WordPress to inject the pixel code.
+     *
+     * @return void
+     */
+    public static function inject_pixel_code() {
+    }
+
+
+    /**
+     * Adds a hook to WordPress to inject the pixel code for a specific plugin.
+     *
+     * The hook is added to the WordPress action system.
+     * The hook is the $hook_name, which is the name of the hook that
+     * triggers the injection of the pixel code.
+     * The callback is a closure that adds a hook to the
+     * 'wp_footer' action to inject the pixel code. The hook is
+     * added with a priority of 11.
+     *
+     * The function that is called is the $inject_function,
+     * which is a static method of the class $classname.
+     * The function is called with the parameters $argv.
+     *
+     * The hook is added with a priority of $priority,
+     * which is optional and defaults to 11.
+     *
+     * @param array $pixel_fire_for_hook_params {
+     *     Parameters for adding the hook.
+     *
+     *     @type string $hook_name       The name of the
+     * hook that triggers the injection of the pixel code.
+     *     @type string $classname       The name of the
+     * class that contains the function that injects the pixel code.
+     *     @type string $inject_function The name of
+     * the function that injects the pixel code.
+     *     @type int    $priority        The priority of
+     * the hook. Optional and defaults to 11.
+     * }
+     */
+    public static function add_pixel_fire_for_hook(
+        $pixel_fire_for_hook_params
+    ) {
+        $hook_name       = $pixel_fire_for_hook_params['hook_name'];
+        $classname       = $pixel_fire_for_hook_params['classname'];
+        $inject_function = $pixel_fire_for_hook_params['inject_function'];
+        $priority        = isset( $pixel_fire_for_hook_params['priority'] ) ?
+        $pixel_fire_for_hook_params['priority'] : 11;
+
+        $user_function = array(
+            $classname,
+            $inject_function,
+        );
+        $reflection    = new ReflectionMethod( $classname, $inject_function );
+        $argc          = $reflection->getNumberOfParameters();
+        $argv          = $reflection->getParameters();
+
+        $callback = function () use ( $user_function, $argv ) {
+            $hook_wp_footer = function () use ( $user_function, $argv ) {
+                \call_user_func_array( $user_function, $argv );
+            };
+        add_action(
+            'wp_footer',
+            $hook_wp_footer,
+            11
+        );
+        };
+
+        add_action( $hook_name, $callback, $priority, $argc );
+    }
+}