SugarCRM源码分析之loadComposer

        这里主要分析./include/utils/autoload.php中init方法里的加载composer相关方法，其主要作用是在自动加载时引入相关的composer类。

// 加载的composer文件protected static $composerPaths = array(    'include_paths' => 'vendor/composer/include_paths.php',    'autoload_namespaces' => 'vendor/composer/autoload_namespaces.php',    'autoload_psr4' => 'vendor/composer/autoload_psr4.php',    'autoload_classmap' => 'vendor/composer/autoload_classmap.php',);// psr4命名空间存放，按多到少加载public static $namespaceMapPsr4 = array();// psr0命名空间存放public static $namespaceMap = array();

        上面的三个变量作用这下面的几个composer方法。

public static function init() {    ```    self::loadComposerIncludePaths();    self::loadComposerPsr4();    self::loadComposerPsr0();    ```}public static function loadComposerIncludePaths() {    // 加载include_paths并加入get_include_path中，但是目前为空    $includePaths = self::getIncludeReturn(self::$composerPaths['include_paths']);    array_push($includePaths, get_include_path());    set_include_path(join(PATH_SEPARATOR, $includePaths));}public static function loadComposerPsr4() {    $map = self::getIncludeReturn(self::$composerPaths['autoload_psr4']);    foreach ($map as $namespace => $paths) {        if (is_array($paths)) {            foreach ($paths as $path) {                $path = self::normalizeFilePath($path);                self::addNamespace($namespace, $path, 'psr4');            }        } else {            $path = self::normalizeFilePath($paths);            self::addNamespace($namespace, $path, 'psr4');        }    }}public static function loadComposerPsr0() {    $map = self::getIncludeReturn(self::$composerPaths['autoload_namespaces']);    foreach ($map as $namespace => $paths) {        if (is_array($paths)) {            foreach ($paths as $path) {                $path = self::normalizeFilePath($path);                self::addNamespace($namespace, $path, 'psr0');            }        } else {            $path = self::normalizeFilePath($paths);            self::addNamespace($namespace, $path, 'psr0');        }    }}public static function addNamespace($prefix, $dir, $type = 'psr0') {    // select which map to use    $map = ($type === 'psr4') ? 'namespaceMapPsr4' : 'namespaceMap';    // enforce trailing \    $prefix = rtrim($prefix, '\\') . '\\';    // remove trailing / and normalize path    $dir = rtrim(self::normalizeFilePath($dir), '/');    // use a list of paths per prefix    self::${$map}[$prefix][] = $dir;    // The order of self::$namespace is important because the first match    // will win. When registering new namespace dynamically we need to make    // sure this array is ordered from more to less specific.    // 从多到少排序    // 这一步主要是在自动加载时循环数组从头开始，匹配到了便退出循环    uksort(self::${$map}, function ($val1, $val2) {        $level1 = substr_count($val1, '\\');        $level2 = substr_count($val2, '\\');        if ($level1 > $level2) {            return -1;        } elseif ($level1 < $level2) {            return 1;        } else {            // if levels are the same, sort alphabetically for predictable result            return strcasecmp($val1, $val2);        }    });}

        可以看看./vendor/composer/目录下两个composer文件

// autoload_psr4.php @generated by Composer$vendorDir = dirname(dirname(__FILE__));$baseDir = dirname($vendorDir);return array(    'Sugarcrm\\Sugarcrm\\inc\\' => array($baseDir . '/include'),    'Sugarcrm\\Sugarcrm\\custom\\inc\\' => array($baseDir . '/custom/include'),    'Sugarcrm\\Sugarcrm\\custom\\' => array($baseDir . '/custom/src', $baseDir . '/custom'),    'Sugarcrm\\Sugarcrm\\' => array($baseDir . '/src', $baseDir . '/'),);// autoload_namespaces.php @generated by Composer$vendorDir = dirname(dirname(__FILE__));$baseDir = dirname($vendorDir);return array(    'Elastica\\Test' => array($vendorDir . '/ruflin/elastica/test/lib'),    'Elastica' => array($vendorDir . '/ruflin/elastica/lib'),);