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

说明

uopz_flags(string $function, int $flags = PHP_INT_MAX): int

uopz_flags(string $class, string $function, int $flags = PHP_INT_MAX): int

Get or set the flags on a class or function entry at runtime

参数

class: The name of a class
function: The name of the function. If class is given and an empty string is passed as function, 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.

返回值

If setting, returns old flags, else returns flags

错误／异常

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.

更新日志

版本	说明
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.

范例

示例 #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));
?>

以上例程会输出：

bool(false)
bool(false)
int(1234567890)
bool(true)
bool(true)

示例 #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());
?>

以上例程会输出：

bool(false)

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User Contributed Notes 2 notes

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ASchmidt at Anamera dot net ¶

3 years ago


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.

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ASchmidt at Anamera dot net ¶

1 year 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.

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