runkit_method_redefine

(PECL runkit >= 0.7.0)

runkit_method_redefine — Dynamically changes the code of the given method

说明

bool runkit_method_redefine ( string $classname , string $methodname , string $args , string $code [, int $flags = RUNKIT_ACC_PUBLIC ] )

Note: 此函数不能用来操作当前正常运行（或运行链上）的方法。

Warning

此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担。

参数

classname: The class in which to redefine the method
methodname: The name of the method to redefine
args: Comma-delimited list of arguments for the redefined method
code: The new code to be evaluated when methodname is called
flags: The redefined method can be RUNKIT_ACC_PUBLIC, RUNKIT_ACC_PROTECTED or RUNKIT_ACC_PRIVATE

Note:
This parameter is only used as of PHP 5, because, prior to this, all methods were public.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

范例

Example #1 runkit_method_redefine() example


<?php
class Example {
    function foo() {
        return "foo!\n";
    }
}

// create an Example object
$e = new Example();

// output Example::foo() (before redefine)
echo "Before: " . $e->foo();

// Redefine the 'foo' method
runkit_method_redefine(
    'Example',
    'foo',
    '',
    'return "bar!\n";',
    RUNKIT_ACC_PUBLIC
);

// output Example::foo() (after redefine)
echo "After: " . $e->foo();
?>

以上例程会输出：

Before: foo!
After: bar!

参见

runkit_method_add() - Dynamically adds a new method to a given class
runkit_method_copy() - Copies a method from class to another
runkit_method_remove() - Dynamically removes the given method
runkit_method_rename() - Dynamically changes the name of the given method
runkit_function_redefine() - Replace a function definition with a new implementation

用户评论:

lauri dot piisang at cashongo dot co dot uk (2012-06-15 14:07:17)

A sample implementation of redefining a public static method of symfony's sfDate to 'travel in time' with runkit: <?php //Going back in time 3 days $subtractablePeriod = 3; runkit_method_redefine('sfDateTimeToolkit', 'now', '', 'return strtotime("-'.$subtractablePeriod.' days");', (RUNKIT_ACC_PUBLIC | RUNKIT_ACC_STATIC)); //Do Stuff here that would otherwise get the current date //Return to realtime runkit_method_redefine('sfDateTimeToolkit', 'now', '', 'return time();', (RUNKIT_ACC_PUBLIC | RUNKIT_ACC_STATIC)); ?>

anton at bondarenko.cc (2012-02-10 12:38:37)

In last runkit versions you can also use RUNKIT_ACC_STATIC constant as flags parametr to redifine static function.