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php strip all tags

The below function can strip almost all tags from a string.

function strip_all_tags($string)
{
    $string = preg_replace( '@<(script|style)[^>]*?>.*?@si', '', $string );
    $string = strip_tags($string);
    return trim($string);
}

$a = '<script type="text/javascript" src="jquery.js"></script>
<div id="test" style="padding:5px; color:red;">Hello world</div>';

echo strip_all_tags($a); // outputs: Hello world
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