Add a linter rule for detecting redeclared functions
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	joshuaspence
	Aug 2 2014, 7:51 AM

Description

The following code does not raise any errors in linting:

<?php

function array_key_exists($key, array $array) {
    return true;
}

Running this code, however, will throw a fatal error:

PHP Fatal error:  Cannot redeclare array_key_exists()

Simiarly:

<?php

function foo() {}
function foo() {}

Actually, arc liberate can detect this already.