If the method name is set to an empty string, then the flags for the CLASS itself will be affected, instead of an individual method. This can be used to remove the "final" attribute from a class.
<?php
declare(strict_types=1);
final class MyClass { function mymethod() {} };
uopz_flags(MyClass::class, '', 0);
?>
Note: Although not documented, setting the method to NULL will also target the CLASS flags, however, that syntax will clash with strict types because of the developer's improper function signature.
uopz_flags
(PECL uopz 2 >= 2.0.2, PECL uopz 5, PECL uopz 6, PECL uopz 7)
uopz_flags — Get or set flags on function or class
Description
Get or set the flags on a class or function entry at runtime
Parameters
-
class -
The name of a class
-
function -
The name of the function. If
classis given and an empty string is passed asfunction, uopz_flags() gets or sets the flags of the class entry. -
flags -
A valid set of ZEND_ACC_ flags. If omitted, uopz_flags() acts as getter.
Return Values
If setting, returns old flags, else returns flags
Errors/Exceptions
As of PHP 7.4.0, if the parameter flags is passed,
uopz_flags() throws a RuntimeException,
if OPcache is enabled,
and the class entry of class
or the function entry of function is immutable.
Changelog
| Version | Description |
|---|---|
| PECL uopz 5.0.0 |
The flags parameter is now optional. Formerly,
ZEND_ACC_FETCH had to be passed to use uopz_flags()
as getter.
|
Examples
Example #1 uopz_flags() example
<?php
class Test {
public function method() {
return __CLASS__;
}
}
$flags = uopz_flags("Test", "method");
var_dump((bool) (uopz_flags("Test", "method") & ZEND_ACC_PRIVATE));
var_dump((bool) (uopz_flags("Test", "method") & ZEND_ACC_STATIC));
var_dump(uopz_flags("Test", "method", $flags|ZEND_ACC_STATIC|ZEND_ACC_PRIVATE));
var_dump((bool) (uopz_flags("Test", "method") & ZEND_ACC_PRIVATE));
var_dump((bool) (uopz_flags("Test", "method") & ZEND_ACC_STATIC));
?>The above example will output:
bool(false) bool(false) int(1234567890) bool(true) bool(true)
Example #2 "Unfinalize" a Class
<?php
final class MyClass
{
}
$flags = uopz_flags(MyClass::class, '');
uopz_flags(MyClass::class, '', $flags & ~ZEND_ACC_FINAL);
var_dump((new ReflectionClass(MyClass::class))->isFinal());
?>The above example will output:
bool(false)
add a note
User Contributed Notes 2 notes
ASchmidt at Anamera dot net ¶
6 years ago
ASchmidt at Anamera dot net ¶
4 years ago
To clarify the above hint:
"...the class entry of class or the function entry of function is immutable"
Neither PHP class or function definitions have any "immutable" keyword - so this note is confusing, as it implies that a PHP programmer has any control over this. In reality, the "immutable" state mentioned is an internally-controlled optimization/shared memory feature of OPcache.
Consequently, if one has a need to set (alter) the flags of a PHP class or function by means of "uopz_flags()", then it is necessary to EXCLUDE the PHP script of the referenced class or function from OPcache, using the "opcache.blacklist_filename" INI parameter.
