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    <p>You could use <a href="http://uk3.php.net/manual/en/function.token-get-all.php" rel="nofollow noreferrer"><code>token_get_all()</code></a> to get all the tokens from a PHP file e.g.</p> <pre><code>&lt;?php $fileStr = file_get_contents('file.php'); foreach (token_get_all($fileStr) as $token) { if ($token[0] == T_CONSTANT_ENCAPSED_STRING) { echo "found string {$token[1]}\r\n"; //$token[2] is line number of the string } } </code></pre> <p>You could do a really dirty check that it isn't being used as an array index by something like:</p> <pre><code>$fileLines = file('file.php'); //inside the loop and if $line = $fileLines[$token[2] - 1]; if (false === strpos($line, "[{$token[1]}]")) { //not an array index } </code></pre> <p>but you will really struggle to do this properly because someone might have written something you might not be expecting e.g.:</p> <pre><code>$str = 'string that is not immediately an array index'; doSomething($array[$str]); </code></pre> <hr> <p><strong>Edit</strong> As Ant P says, you would probably be better off looking for <code>[</code> and <code>]</code> in the surrounding tokens for the second part of this answer rather than my <code>strpos</code> hack, something like this:</p> <pre><code>$i = 0; $tokens = token_get_all(file_get_contents('file.php')); $num = count($tokens); for ($i = 0; $i &lt; $num; $i++) { $token = $tokens[$i]; if ($token[0] != T_CONSTANT_ENCAPSED_STRING) { //not a string, ignore continue; } if ($tokens[$i - 1] == '[' &amp;&amp; $tokens[$i + 1] == ']') { //immediately used as an array index, ignore continue; } echo "found string {$token[1]}\r\n"; //$token[2] is line number of the string } </code></pre>
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    1. POFinding all string in a PHP code base
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    1. USTom Haigh
    1. USTom Haigh
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    1. CO+1 never knew about this function. Thats awesome.
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    2. COOnly thing is that for $_SESSION['logsession'] it actually gives me found string 'logsession' which is of course not what I want for localization.
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    3. COAh you have since edited.
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