[PHP-DEV] PHP 4.0 Bug #8130 Updated: Changing a copy of an array affects the original From: wstockal <email protected>
Date: 12/06/00

ID: 8130
User Update by: wstockal <email protected>
Status: Open
Bug Type: Arrays related
Description: Changing a copy of an array affects the original

OK, this only affects objects in the array whose methods
have been accessed. Other objects are still copies. It
also works on php-4.0.3pl1 on the Win32 platform.

Previous Comments:
---------------------------------------------------------------------------

[2000-12-05 20:28:28] wstockal <email protected>
A short script:
<?php
  class test_class_2{
        var $name;
        function distort_reality(){
                 echo("Method Called.<br>n");
                 return;
        }
  }
  $a[] = new test_class_2;
  $a[0]->name = 'Original';
  echo('$b = $a<br>'."n");
  $b = $a;
  echo("Original contains: {$a[0]->name}<br>n");
  echo("Copy contains: {$b[0]->name}<br><p>n");
  echo("Change contents for $b<br>n");
  $b[0]->name = 'Copy';
  echo("Original contains: {$a[0]->name}<br>n");
  echo("Copy contains: {$b[0]->name}<br><p>n");
  $a[0]->distort_reality();
  echo('Once again, $b = $a<br>'."n");
  $b = $a;
  echo("Original contains: {$a[0]->name}<br>n");
  echo("Copy contains: {$b[0]->name}<br><p>n");
  echo("Change contents for $b<br>n");
  $b[0]->name = 'Copy';
  echo("Original contains: {$a[0]->name}<br>n");
  echo("Copy contains: {$b[0]->name}<br>n");
?>

The output from the script:

$b = $a
Original contains: Original
Copy contains: Original

Change contents for $b
Original contains: Original
Copy contains: Copy

Method Called.
Once again, $b = $a
Original contains: Original
Copy contains: Original

Change contents for $b
Original contains: Copy
Copy contains: Copy

Basically, if $a is an array of objects and any method of an object is called any subsequent copy of $a becomes linked to the original. Any change to the copy propagates through to the original.

Configure line:
 './configure' '--with-config-file-path=/usr/local/stronghold/conf' '--with-apxs=/usr/local/stronghold/bin/apxs' '--enable-versioning' '--disable-debug' '--with-zlib' '--with-gd=/usr/local' '--with-gdbm' '--with-db2' '--with-mysql' '--with-xml' '--with-ldap' '--with-cpdflib=/usr/local' '--with-png-dir=/usr' '--with-jpeg-dir=/usr' '--with-tiff-dir=/usr' '--with-xpm-dir=/usr/X11R6' '--enable-sysvshm=yes' '--enable-sysvsem=yes' '--enable-track-vars=yes' '--enable-bcmath=yes' '--enable-memory-limit=yes'

Running as a module under apache 1.3.14

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

Full Bug description available at: http://bugs.php.net/?id=8130 

-- 
PHP Development Mailing List <http://www.php.net/>
To unsubscribe, e-mail: php-dev-unsubscribe <email protected>
For additional commands, e-mail: php-dev-help <email protected>
To contact the list administrators, e-mail: php-list-admin <email protected>