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<?php echo "<script>"; echo json_encode('"</script><script>alert("XSS");</script>"', JSON_UNESCAPE_SLASH); echo "</script>";
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
<script> Fatal error: Uncaught Error: Undefined constant "JSON_UNESCAPE_SLASH" in /in/TKmg6:5 Stack trace: #0 {main} thrown in /in/TKmg6 on line 5
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 <script> Fatal error: Uncaught Error: Undefined constant "JSON_UNESCAPE_SLASH" in /in/TKmg6:5 Stack trace: #0 {main} thrown in /in/TKmg6 on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
<script> Warning: Use of undefined constant JSON_UNESCAPE_SLASH - assumed 'JSON_UNESCAPE_SLASH' (this will throw an Error in a future version of PHP) in /in/TKmg6 on line 5 Warning: json_encode() expects parameter 2 to be int, string given in /in/TKmg6 on line 5 </script>
Output for 7.2.0 - 7.2.33
<script> Warning: Use of undefined constant JSON_UNESCAPE_SLASH - assumed 'JSON_UNESCAPE_SLASH' (this will throw an Error in a future version of PHP) in /in/TKmg6 on line 5 Warning: json_encode() expects parameter 2 to be integer, string given in /in/TKmg6 on line 5 </script>
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25
<script> Notice: Use of undefined constant JSON_UNESCAPE_SLASH - assumed 'JSON_UNESCAPE_SLASH' in /in/TKmg6 on line 5 Warning: json_encode() expects parameter 2 to be integer, string given in /in/TKmg6 on line 5 </script>
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
<script> Notice: Use of undefined constant JSON_UNESCAPE_SLASH - assumed 'JSON_UNESCAPE_SLASH' in /in/TKmg6 on line 5 Warning: json_encode() expects parameter 2 to be long, string given in /in/TKmg6 on line 5 </script>

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