runkit_method_redefine(3) [php man page]

RUNKIT_METHOD_REDEFINE(3)						 1						 RUNKIT_METHOD_REDEFINE(3)

runkit_method_redefine - Dynamically changes the code of the given method

SYNOPSIS

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

DESCRIPTION

       Note

	      This function cannot be used to manipulate the currently running (or chained) method.

       Warning

	      This  function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in
	      a future release of PHP. This function should be used at your own risk.

PARAMETERS

	      o $classname
		- The class in which to redefine the method

	      o $methodname
		- The name of the method to redefine

	      o $args
		- Comma-delimited list of arguments for the redefined method

	      o $code
		- The new code to be evaluated when $methodname is called

	      o $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.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      runkit_method_redefine(3) example

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

	      // 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!
";',
		  RUNKIT_ACC_PUBLIC
	      );

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

	      The above example will output:

	      Before: foo!
	      After: bar!

SEE ALSO

       runkit_method_add(3), runkit_method_copy(3), runkit_method_remove(3), runkit_method_rename(3), runkit_function_redefine(3).

PHP Documentation Group 												 RUNKIT_METHOD_REDEFINE(3)

UNSET(3)								 1								  UNSET(3)

unset - Unset a given variable

SYNOPSIS

       void unset (mixed  $var, [mixed	$...])

DESCRIPTION

       unset(3) destroys the specified variables.

	The behavior of unset(3) inside of a function can vary depending on what type of variable you are attempting to destroy.

	If  a  globalized variable is unset(3) inside of a function, only the local variable is destroyed. The variable in the calling environment
       will retain the same value as before unset(3) was called.

       <?php
       function destroy_foo()
       {
	   global $foo;
	   unset($foo);
       }

       $foo = 'bar';
       destroy_foo();
       echo $foo;
       ?>

       The above example will output:

       bar

	To unset(3) a global variable inside of a function, then use the $GLOBALS array to do so:

       <?php
       function foo()
       {
	   unset($GLOBALS['bar']);
       }

       $bar = "something";
       foo();
       ?>

	If a variable that is PASSED BY REFERENCE is unset(3) inside of a function, only the local variable is	destroyed.  The  variable  in  the
       calling environment will retain the same value as before unset(3) was called.

       <?php
       function foo(&$bar)
       {
	   unset($bar);
	   $bar = "blah";
       }

       $bar = 'something';
       echo "$bar
";

       foo($bar);
       echo "$bar
";
       ?>

       The above example will output:

       something
       something

	If  a static variable is unset(3) inside of a function, unset(3) destroys the variable only in the context of the rest of a function. Fol-
       lowing calls will restore the previous value of a variable.

       <?php
       function foo()
       {
	   static $bar;
	   $bar++;
	   echo "Before unset: $bar, ";
	   unset($bar);
	   $bar = 23;
	   echo "after unset: $bar
";
       }

       foo();
       foo();
       foo();
       ?>

       The above example will output:

       Before unset: 1, after unset: 23
       Before unset: 2, after unset: 23
       Before unset: 3, after unset: 23

PARAMETERS

	      o $var
		- The variable to be unset.

	      o $...
		- Another variable ...

RETURN VALUES

	No value is returned.

EXAMPLES

       Example #1

	      unset(3) example

	      <?php
	      // destroy a single variable
	      unset($foo);

	      // destroy a single element of an array
	      unset($bar['quux']);

	      // destroy more than one variable
	      unset($foo1, $foo2, $foo3);
	      ?>

       Example #2

	      Using (unset) casting

	      (unset) casting is often confused with the unset(3) function.  (unset) casting serves only as a NULL-type cast, for completeness. It
	      does not alter the variable it's casting.

	      <?php
	      $name = 'Felipe';

	      var_dump((unset) $name);
	      var_dump($name);
	      ?>

	      The above example will output:

	      NULL
	      string(6) "Felipe"

NOTES

       Note

	      Because this is a language construct and not a function, it cannot be called using variable functions.

       Note

	       It is possible to unset even object properties visible in current context.

       Note

	       It is not possible to unset $this inside an object method since PHP 5.

       Note

	       When using unset(3) on inaccessible object properties, the __unset() overloading method will be called, if declared.

SEE ALSO

       isset(3), empty(3), __unset(), array_splice(3).

PHP Documentation Group 														  UNSET(3)