Auto-initialization From Boolean¶
The auto-initialization is the conversion a boolean false or true, to an array, by using the array syntax on it.
When applied to a property, it may be impossible, given the type of that property. The warning message also appears if the type allow it: it is recommended to convert the property to an array before using the array syntax.
PHP code¶
<?php
class X {
public bool $property = false;
public bool|array $property2 = false;
}
$x = new X;
// Fatal error, as type doesn't allow it
$x->property[3] = 2;
// Deprecated error, as type allow it
$x->property2[4] = 5;
?>
Before¶
PHP Parse error: syntax error in /codes/autoInitializeArrayFromBool.php on line 4
Parse error: syntax error in /codes/autoInitializeArrayFromBool.php on line 4
After¶
PHP Fatal error: Uncaught TypeError: Cannot auto-initialize an array inside property X::$property of type bool in /codes/autoInitializeArrayFromBool.php:8
Stack trace:
#0 {main}
thrown in /codes/autoInitializeArrayFromBool.php on line 8
Fatal error: Uncaught TypeError: Cannot auto-initialize an array inside property X::$property of type bool in /codes/autoInitializeArrayFromBool.php:8
Stack trace:
#0 {main}
thrown in /codes/autoInitializeArrayFromBool.php on line 8
PHP version change¶
This behavior changed in 7.4
