3v4l.org

run code in 300+ PHP versions simultaneously
<?php a = array(TRUE => 'good', FALSE => 'bad'); print a[true]; print b[0];
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.22
Parse error: syntax error, unexpected '=' in /in/hPX5O on line 2
Process exited with code 255.
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177.47 ms | 1395 KiB | 58 Q