3v4l.org

run code in 300+ PHP versions simultaneously
<?php $first_number = 10; $second_number = first_number += 2; echo second_number; ?>
Output for 5.4.0 - 5.4.23
Parse error: syntax error, unexpected '+=' (T_PLUS_EQUAL) in /in/bp99Q on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_PLUS_EQUAL in /in/bp99Q on line 4
Process exited with code 255.
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196.01 ms | 1399 KiB | 60 Q