<?php
spl_autoload_register(function ($className) {
$className = ltrim($className, '\');
$fileName = '';
if ($lastNsPos = strripos($className, '\')) {
$namespace = substr($className, 0, $lastNsPos);
$className = substr($className, $lastNsPos + 1);
$fileName = str_replace('\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
}
$fileName = __DIR__ . DIRECTORY_SEPARATOR . $fileName . $className . '.php';
if (file_exists($fileName)) {
require $fileName;
return true;
}
return false;
});For example, the call_user_func() function can receive a user-defined function as a parameter, which is a built-in function of PHP. The callback function can not only be a function, but also a method of an object and a method of a static class. A PHP function is passed as a function name string. Any built-in or user-defined function can be passed, except language structures such as array(), echo(), empty(), eval(), exit(), isset() ,list(),print(),unset(), etc.
If you want to pass in the method of an object, it needs to be passed in the form of an array. The array subscript 0 is the object name and the subscript 1 is the method name. If there is no static class instantiated as an object, to pass its method, replace the object name specified by the array 0 subscript with the name of the class.
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