Dav*_*ers 5

$str = '\\u0627\\u0644\\u0631\\u0626\\u064a\\u0633';\n$converted = preg_replace('/\\\\\\u([0-9a-z]{4})/i', '&#x$1;', $str);\necho $converted;  // displays \xd8\xa7\xd9\x84\xd8\xb1\xd8\xa6\xd9\x8a\xd8\xb3\n
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