Reason for failure of PHP function __autoload (related to smarty)

PHP function __autoload can achieve simple automatic loading, but after introducing smarty, it was found that the __autoload function was invalid. Later, it was found that the reason was the spl_autoload_register function.

Execute the following code:

function __autoload($name)
{
	require 'class/'.$name.'.php';
	echo '1';
}
function autoload_test($name)
{
	echo '2';
}
spl_autoload_register('autoload_test');
$ca=new Ca();

The result is output 2. You can see that the __autoload function is not executed. The official website’s analysis is: If the __autoload() function has been implemented in your program, it must be explicitly registered to __autoload() queue. Because the spl_autoload_register() function will replace the __autoload() function in Zend Engine with spl_autoload() or spl_autoload_call().

In order for the code to work properly, the __autoload function should be re-registered:

function __autoload($name)
{
	require 'class/'.$name.'.php';
	echo '1';
}
function autoload_test($name)
{
	echo '2';
}
spl_autoload_register('autoload_test');
spl_autoload_register('__autoload');
$ca=new Ca();

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