Recursive Comparison Of Arrays¶
Until PHP 8.4, recursive arrays should not be compared one another, as the engine might ends in an infinite loop.
In PHP 8.4, it is now a catchable Error.
PHP code¶
<?php
$array = [1,2,3, &$array];
$array2 = [1,2,3, &$array2];
var_dump($array == $array2);
?>
Before¶
PHP Fatal error: Nesting level too deep - recursive dependency?
Fatal error: Nesting level too deep - recursive dependency?
After¶
PHP Fatal error: Uncaught Error: Nesting level too deep - recursive dependency?
Fatal error: Uncaught Error: Nesting level too deep - recursive dependency?
PHP version change¶
This behavior changed in 8.4
