From: [EMAIL PROTECTED]
Operating system: Linux redhat 7.1
PHP version: 4.0.4pl1
PHP Bug Type: Variables related
Bug description: function pass by reference isn't consistent.
<?php
//This script demonstrates a problem that I'm
//having w/ php. It shows that adding a
//reference of a var to an array inside a
//function doesn't actually add a reference,
//but a copy of the object.
//I have a simple class called foo
//which contains 1 member $content,
//and 2 methods: push_works() and
//push_doesnt().
//both push_* functions are used to
//illustrate my problem of stuffing a
//variable reference inside an array.
//NOTE: this is not specific to objects
//and object methods. This same problem
//will happen if you use a function push()
//and a global (dumb) for the $content array.
function xmp_var_dump($var) {
echo "<xmp>";
var_dump( $var );
echo "</xmp>";
}
//our test class.
//nothing but a container to hold
//the content array.
//this is an example of large class
//that I do the same thing w/
class foo {
var $content = array();
//both of these "push" functions
//illustrate the idea of adding
//some content to an array.
//both should work, but only 1 does.
//personally I would prefer the
//syntax of the push_doesnt()
//function, so the caller doesn't
//have to pass the var with the &
//in front.
//this function works if the caller
//passes the var by reference.
//ie $foo->push_works( &$my_str );
function push_works( $content ) {
array_push($this->content, &$content);
}
//this function SHOULD work since it
//declares its parameter as a reference.
//the caller would not have to pass the
//var by reference.
//ie $foo->push_doesnt( $my_str );
function push_doesnt( &$content ) {
array_push($this->content, $content);
}
}
//create the container classes
//$foo will contain $bar later.
$foo = new foo;
//You should never see the current
//contents of this string,
//since we want to pass it by reference,
//and then change it b4 we dump it out.
$my_str = "You shouldn't even see this string.";
//notice I have to prepend & to the
//push_works() function or it doesn't
//work, which makes sense because
//the parameter is defined as by value.
//
$foo->push_works( &$my_str );
//this function should work, since
//the parameter is defined as by
//reference.
$foo->push_doesnt( $my_str );
//one more try prepending the &
//to push_doesnt, which I shouldn't
//have to do anyways, since the
//parameter is defined as by reference.
//This still doesn't work.
$foo->push_doesnt( &$my_str );
$my_str = "this is what you should read!";
//at this point the DESIRED result is
//3 elements in the $foo->content array
//that are all references to $my_str.
xmp_var_dump( $foo );
xmp_var_dump( phpversion() );
?>
--
Edit bug report at: http://bugs.php.net/?id=12030&edit=1
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