3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo 'blah'; session_start();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
blah Warning: session_start(): Session cannot be started after headers have already been sent in /in/42shF on line 6
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 blah Warning: session_start(): Session cannot be started after headers have already been sent in /in/42shF on line 6
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
blah Warning: session_start(): Cannot start session when headers already sent in /in/42shF on line 6
Output for 7.1.25
blah Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/42shF:2) in /in/42shF on line 6 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/42shF:2) in /in/42shF on line 6

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169.52 ms | 402 KiB | 153 Q