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<?php
/**
* Copyright 2017 Facebook, Inc.
*
* You are hereby granted a non-exclusive, worldwide, royalty-free license to
* use, copy, modify, and distribute this software in source code or binary
* form for use in connection with the web services and APIs provided by
* Facebook.
*
* As with any software that integrates with the Facebook platform, your use
* of this software is subject to the Facebook Developer Principles and
* Policies [http://developers.facebook.com/policy/]. This copyright notice
* shall be included in all copies or substantial portions of the software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
/**
* You only need this file if you are not using composer.
* Why are you not using composer?
* https://getcomposer.org/
*/
if (version_compare(PHP_VERSION, '5.4.0', '<')) {
throw new Exception('The Facebook SDK requires PHP version 5.4 or higher.');
}
require_once __DIR__ . '/polyfills.php';
/**
* Register the autoloader for the Facebook SDK classes.
*
* Based off the official PSR-4 autoloader example found here:
* https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md
*
* @param string $class The fully-qualified class name.
*
* @return void
*/
spl_autoload_register(function ($class) {
// project-specific namespace prefix
$prefix = 'Facebook\\';
// For backwards compatibility
$customBaseDir = '';
// @todo v6: Remove support for 'FACEBOOK_SDK_V4_SRC_DIR'
if (defined('FACEBOOK_SDK_V4_SRC_DIR')) {
$customBaseDir = FACEBOOK_SDK_V4_SRC_DIR;
} elseif (defined('FACEBOOK_SDK_SRC_DIR')) {
$customBaseDir = FACEBOOK_SDK_SRC_DIR;
}
// base directory for the namespace prefix
$baseDir = $customBaseDir ?: __DIR__ . '/';
// does the class use the namespace prefix?
$len = strlen($prefix);
if (strncmp($prefix, $class, $len) !== 0) {
// no, move to the next registered autoloader
return;
}
// get the relative class name
$relativeClass = substr($class, $len);
// replace the namespace prefix with the base directory, replace namespace
// separators with directory separators in the relative class name, append
// with .php
$file = rtrim($baseDir, '/') . '/' . str_replace('\\', '/', $relativeClass) . '.php';
// if the file exists, require it
if (file_exists($file)) {
require $file;
}
});
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