3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo json_encode(array("dog")); echo json_encode(array("dog","cat")); echo json_enocde(array_keys(array("cat","dog","fish"));
Output for 5.3.0 - 5.3.19, 5.4.0 - 5.4.9
Parse error: syntax error, unexpected ';' in /in/Y1q0h on line 8
Process exited with code 255.
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166.88 ms | 1395 KiB | 37 Q