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Facebook autoload Guest on 24th April 2021 11:18:15 PM
  1. <?php
  2. /**
  3.  * Copyright  Facebook, Inc.
  4.  *
  5.  * You are hereby granted a non-exclusive, worldwide, royalty-free license to
  6.  * use, copy, modify, and distribute this software in source code or binary
  7.  * form for use in connection with the web services and APIs provided by
  8.  * Facebook.
  9.  *
  10.  * As with any software that integrates with the Facebook platform, your use
  11.  * of this software is subject to the Facebook Developer Principles and
  12.  * Policies [http://developers.facebook.com/policy/]. This copyright notice
  13.  * shall be included in all copies or substantial portions of the software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  *
  23.  */
  24.  
  25. /**
  26.  * You only need this file if you are not using composer.
  27.  * Why are you not using composer?
  28.  * https://getcomposer.org/
  29.  */
  30.  
  31. if (version_compare(PHP_VERSION, '5.4.0', '<')) {
  32.     throw new Exception('The Facebook SDK requires PHP version 5.4 or higher.');
  33. }
  34.  
  35. require_once __DIR__ . '/polyfills.php';
  36.  
  37. /**
  38.  * Register the autoloader for the Facebook SDK classes.
  39.  *
  40.  * Based off the official PSR-4 autoloader example found here:
  41.  * https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md
  42.  *
  43.  * @param string $class The fully-qualified class name.
  44.  *
  45.  * @return void
  46.  */
  47. spl_autoload_register(function ($class) {
  48.     // project-specific namespace prefix
  49.     $prefix = 'Facebook\\';
  50.  
  51.     // For backwards compatibility
  52.     $customBaseDir = '';
  53.     // @todo v6: Remove support for 'FACEBOOK_SDK_V4_SRC_DIR'
  54.     if (defined('FACEBOOK_SDK_V4_SRC_DIR')) {
  55.         $customBaseDir = FACEBOOK_SDK_V4_SRC_DIR;
  56.     } elseif (defined('FACEBOOK_SDK_SRC_DIR')) {
  57.         $customBaseDir = FACEBOOK_SDK_SRC_DIR;
  58.     }
  59.     // base directory for the namespace prefix
  60.     $baseDir = $customBaseDir ?: __DIR__ . '/';
  61.  
  62.     // does the class use the namespace prefix?
  63.     $len = strlen($prefix);
  64.     if (strncmp($prefix, $class, $len) !== 0) {
  65.         // no, move to the next registered autoloader
  66.         return;
  67.     }
  68.  
  69.     // get the relative class name
  70.     $relativeClass = substr($class, $len);
  71.  
  72.     // replace the namespace prefix with the base directory, replace namespace
  73.     // separators with directory separators in the relative class name, append
  74.     // with .php
  75.     $file = rtrim($baseDir, '/') . '/' . str_replace('\\', '/', $relativeClass) . '.php';
  76.  
  77.     // if the file exists, require it
  78.     if (file_exists($file)) {
  79.         require $file;
  80.     }
  81. });

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