<?xml version="1.0"?>
<documentation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="https://phpcsstandards.github.io/PHPCSDevTools/phpcsdocs.xsd"
    title="New Uniform Variable Syntax"
    >
    <standard>
    <![CDATA[
    As of PHP 7.0, indirect access to variables, properties and methods will now be evaluated strictly in left-to-right order.

    Prior to PHP 7.0, certain expressions would be interpreted using a right-to-left evaluation order, which means that the result of these expressions will be different in PHP 5.x versus PHP 7.x.

    The evaluation order can be made explicit and enforced to be the same PHP cross-version by using curly braces to clarify how the expression should be evaluated.
    ]]>
    </standard>
    <code_comparison>
        <code title="Cross-version compatible: using curly braces to explicitly enforce a specific evaluation order.">
        <![CDATA[
echo $<em>{</em>$var['key1']['key2']<em>}</em>;
echo $obj-><em>{</em>$var['key']<em>}</em>;
echo $obj-><em>{</em>$var['key']<em>}</em>();
echo MyClass::<em>{</em>$var['key']<em>}</em>();
        ]]>
        </code>
        <code title="Cross-version INcompatible: without curly braces the interpretation of these indirect accesses to variables, properties and methods will behave different in PHP &lt;= 5.6 versus PHP 7.0+.">
        <![CDATA[
echo <em>$$var['key1']['key2']</em>;
echo <em>$obj->$var['key']</em>;
echo <em>$obj->$var['key']()</em>;
echo <em>MyClass::$var['key']()</em>;
        ]]>
        </code>
    </code_comparison>
</documentation>
