3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = []; $i = 0; while($i++) $arr[$1] = "hello"; ?>
Output for 5.4.0 - 5.4.21
Parse error: syntax error, unexpected '1' (T_LNUMBER), expecting variable (T_VARIABLE) or '$' in /in/Po3uj on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.27
Parse error: syntax error, unexpected '[' in /in/Po3uj on line 2
Process exited with code 255.
preferences:
179.67 ms | 1395 KiB | 57 Q