Boolean Used As Array¶
Booleans, true and false are not an array, but it is possible to use the array syntax with it. The values are then always null, and since PHP 7.4, a warning is emitted.
PHP code¶
<?php
// var_dump(true[0]); is not a valid PHP syntax
const MY_CONSTANT = true;
var_dump(MY_CONSTANT[0]);
?>
Before¶
NULL
After¶
PHP Warning: Trying to access array offset on true in /codes/nullAsArray.php on line 3
Warning: Trying to access array offset on null in /codes/nullAsArray.php on line 3
PHP
PHP version change¶
This behavior changed in 7.4
