3v4l.org

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<?php $str = "http://external.ak.fbcdn.net/safe_image.php?d=AQD-PsVh6CG6Q2RK&w=154&h=154&url=https\u00253A\u00252F\u00252Ffbcdn-sphotos-b-a.akamaihd.net\u00252Fhphotos-ak-prn1\u00252Ft1\u00252F1623737_673137756072004_537520808_n.jpg"; $arr = explode("url=", $str); echo $arr[1];
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
https\u00253A\u00252F\u00252Ffbcdn-sphotos-b-a.akamaihd.net\u00252Fhphotos-ak-prn1\u00252Ft1\u00252F1623737_673137756072004_537520808_n.jpg

preferences:
283.71 ms | 406 KiB | 453 Q