What to do if php __autoload fails

php __autoload fails because the spl_autoload_register function replaces the __autoload function in Zend Engine with spl_autoload. The solution is to re-register the __autoload function.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

What should I do if php __autoload fails?

The reason why PHP function __autoload fails (related to smarty)

PHP function __autoload can achieve simple automatic loading, but After introducing smarty, I found that the __autoload function was invalid. Later, I found out 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 has not been executed. The official website’s analysis is: If the __autoload() function has been implemented in your program , it must be explicitly registered to the __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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