Alias Replace Class¶
When a class is defined before an alias, with use, it used to yield a fatal error. Since PHP 8.4, and when the alias is in a different block than the definition, it is possible to replace a class with another one.
While the fatal error has been removed, it now means that a class, local to a namespace, is not always described by its relative name. The class is still distinguisable with its absolute name.
PHP code¶
<?php
namespace A {
class xBefore {}
}
namespace A {
use y as xAfter;
use y as xBefore;
class y {}
print get_class(new y);
}
namespace A {
class xAfter {}
}
?>
Before¶
PHP Fatal error: Cannot use y as xBefore because the name is already in use s/aliasReplace.php on line 10
Fatal error: Cannot use y as xBefore because the name is already in use s/aliasReplace.php on line 10
After¶
A\y
PHP version change¶
This behavior changed in 8.4
