Bug #71172 [Opn]: call a class function whose name is in array

From: Date: Sun, 20 Dec 2015 14:04:21 +0000
Subject: Bug #71172 [Opn]: call a class function whose name is in array
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-198061@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=71172&edit=1

 ID:                 71172
 Updated by:         tpunt@php.net
 Reported by:        php7 at photonensammler dot de
 Summary:            call a class function whose name is in array
 Status:             Open
 Type:               Bug
 Package:            Scripting Engine problem
 Operating System:   Windows 10
 PHP Version:        7.0.1
 Block user comment: N
 Private report:     N

 New Comment:

This is not a bug. This change was introduced by the Uniform Variable Syntax RFC[1].

Take the following line in your FOR loop code:

$this->$values['funcName']();

For PHP 5.6 and below, it will be evaluated as:

// note the braces to enforce different evaluation semantics
$this->{$values['funcName']}();

For PHP 7.0 and above, it will be evaluated as:

// left-to-right evaluation semantics
($this->$values)['funcName']();

To maintain compatibility between both versions, use the first example code (with the curly braces).

[1]: https://wiki.php.net/rfc/uniform_variable_syntax


Previous Comments:
------------------------------------------------------------------------
[2015-12-20 12:56:33] php7 at photonensammler dot de

Description:
------------
Calling a class function whose name is in an array, works in php 7 no longer as in PHP 5.6.x



Test script:
---------------
<?php

class foo {

  private $functions = array(
      array('funcName' => 'FUNC1'),
      array('funcName' => 'FUNC2'),
      array('funcName' => 'FUNC3')
  );

  function FUNC1() {
    echo 'FUNC1', PHP_EOL, PHP_EOL;
  }

  function FUNC2() {
    echo 'FUNC2', PHP_EOL, PHP_EOL;
  }

  function FUNC3() {
    echo 'FUNC3', PHP_EOL, PHP_EOL;
  }

  /** this worked only up to PHP 5.6.16 */
  public function callAllFunctions() {
    foreach ($this->functions as $values) {
      echo 'call ', $values['funcName'], PHP_EOL;
      $this->$values['funcName']();
    }
  }

  /** this code must be used in PHP 7.x
    public function callAllFunctions() {
      foreach ($this->functions as $values) {
        echo 'call ', $values['funcName'], PHP_EOL;
        $fncName = $values['funcName'];
        $this->$fncName();
      }
    }
   */
}

$test = new foo();
$test->callAllFunctions();


Expected result:
----------------
expected result as in PHP 5.6.16:

call FUNC1 
FUNC1 

call FUNC2 
FUNC2 

call FUNC3 
FUNC3


Actual result:
--------------
result in PHP 7.0.1

call FUNC1
Notice: Array to string conversion in ....
.... foo->callAllFunctions() .....
Notice: Undefined property: foo::$Array in ...
....
....
....



------------------------------------------------------------------------



--
Edit this bug report at https://bugs.php.net/bug.php?id=71172&edit=1

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