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14567979
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2013-01-28T17:46:00.327
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2013-01-28T18:02:46.983
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2013-01-28T18:02:46.983
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Here is a trick for you, to pass variables by references via __call magic method: I don't now how long will this works or in witch php versions. I tested on php 5.3.2 Fitst you cannot pass $arguments variable by $reference in __call function definition. Because php falls with error. So first: Here is a code what does not do, what you want with referenced arguments, but nearly good ;) <pre><code> class A { public $x = array(); } class Teszt{ private function addElement( &$list ){ $list->x[] = 'new element'; return count($list->x); } public function __call($name,$arguments){ if (!preg_match('#^add([0-9]+)Element$#', $name, $matches) || $matches[1]<1){ trigger_error ("Function is not exists teszt::$name", E_USER_ERROR); } $ret = null; for($i=0;$i<$matches[1];$i++){ $ret = call_user_func_array(array($this,'addElement'), $arguments); } return $ret; } } $a = new A(); $a->x = array('old element','old element'); $t = new Teszt(); $cnt = $t->add5Element($a); var_dump($a); var_dump($cnt); </code></pre> OUTPUT: <pre><code> PHP Warning: Parameter 1 to Teszt::addElement() expected to be a reference, value given in /home/gkovacs/callMagicWithReference.php on line 19 PHP Stack trace: PHP 1. {main}() /home/gkovacs/callMagicWithReference.php:0 PHP 2. Teszt->add2Element() /home/gkovacs/callMagicWithReference.php:27 PHP 3. Teszt->__call() /home/gkovacs/callMagicWithReference.php:0 PHP 4. call_user_func_array() /home/gkovacs/callMagicWithReference.php:19 PHP Warning: Parameter 1 to Teszt::addElement() expected to be a reference, value given in /home/gkovacs/callMagicWithReference.php on line 19 PHP Stack trace: PHP 1. {main}() /home/gkovacs/callMagicWithReference.php:0 PHP 2. Teszt->add2Element() /home/gkovacs/callMagicWithReference.php:27 PHP 3. Teszt->__call() /home/gkovacs/callMagicWithReference.php:0 PHP 4. call_user_func_array() /home/gkovacs/callMagicWithReference.php:19 object(A)#1 (1) { ["x"]=> array(2) { [0]=> string(11) "old element" [1]=> string(11) "old element" } } NULL </code></pre> ohhh :((( After a litle 'HACK': <pre><code> class A { public $x = array(); } class Teszt{ private function addElement( &$list ){ $list->x[] = 'new element'; return count($list->x); } public function __call($name,$arguments){ if (!preg_match('#^add([0-9]+)Element$#', $name, $matches) || $matches[1]<1){ trigger_error ("Function is not exists teszt::$name", E_USER_ERROR); } $ret = null; //Look at my hand, because i will cheat foreach($arguments as $k=>&$v){ } //end of cheat for($i=0;$i<$matches[1];$i++){ $ret = call_user_func_array(array($this,'addElement'), $arguments); } return $ret; } } $a = new A(); $a->x = array('old element','old element'); $t = new Teszt(); $cnt = $t->add5Element($a); var_dump($a); var_dump($cnt); </code></pre> Output: <pre><code>object(A)#1 (1) { ["x"]=> array(4) { [0]=> string(11) "old element" [1]=> string(11) "old element" [2]=> string(11) "new element" [3]=> string(11) "new element" } } int(4) </code></pre> As we wanted. This works only with objects, but not with array-s. There is a way with array-s to call-time-pass-by-reference ... like this: (and of corse you can use this way with objects too) <pre><code> $cnt = $t->add5Element(&$a); </code></pre> In this case php generate notices ... The easiest way to redefine the function if it is possible. in my code , : private functionaddElement($list) , don't define as reference in parameter list. And as you read in previous message , it will works beacause objects are passed by reference automatically But sometimes , you can not redefine functions because of implemented interfaces or other reasons ... 
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1. POPassing __call() parameters by reference fails. Any work around?
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