3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo "<script>"; echo json_encode('"</script><script>alert("XSS");</script>"'); echo "</script>";
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 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
<script>"\"<\/script><script>alert(\"XSS\");<\/script>\""</script>

preferences:
187.98 ms | 404 KiB | 247 Q