How to unescape Javascript in PHP [duplicate]

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How to decode Unicode escape sequences like “\u00ed&rdquo开发者_JAVA技巧; to proper UTF-8 encoded characters?

I have some javascript text that contains values like '\u003c' (less than sign <).

Is there a php functions that allows me to unescape javascript ?

(I did not expect urldecode to work, though i tried it. It does not indeed.)

yep, would just suggest it, urldecode();

<?php
  function utf8_urldecode($str) {
    $str = preg_replace("/%u([0-9a-f]{3,4})/i","&#x\\1;",urldecode($str));
    return html_entity_decode($str,null,'UTF-8');;
  }
?>

Reference