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Bug #72123 Variable variable assignment from array breaks
Submitted: 2016-04-28 15:38 UTC Modified: 2016-04-28 16:53 UTC
From: haveacigaro at gmail dot com Assigned:
Status: Wont fix Package: Scripting Engine problem
PHP Version: 7.0.5 OS: osx
Private report: No CVE-ID: None
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From: haveacigaro at gmail dot com
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 [2016-04-28 15:38 UTC] haveacigaro at gmail dot com 
Description:
------------
When creating a variable variable from an array, php identifies the string as an array in php 7, but not in previous versions.

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

$content = [
    'layout' => 'heading'
];

$heading = function () {
    return "Hi";
};

$layout = "heading";

echo $$layout(); // Works
echo $$content['layout'](); // Doesnt work

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 [2016-04-28 16:53 UTC] jhdxr@php.net
-Status: Open +Status: Wont fix
 [2016-04-28 16:53 UTC] jhdxr@php.net 
see http://php.net/manual/en/migration70.incompatible.php

Indirect access to variables, properties, and methods will now be evaluated strictly in left-to-right order, as opposed to the previous mix of special cases. The table below shows how the order of evaluation has changed. 

Code that used the old right-to-left evaluation order must be rewritten to explicitly use that evaluation order with curly braces (see the above middle column). This will make the code both forwards compatible with PHP 7.x and backwards compatible with PHP 5.x.
 
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