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run code in 300+ PHP versions simultaneously
<?php error_reporting(-1); echo 'output before headers...'; session_start(); echo 'But we are still alive!!! Ha! Regardless error reporting';
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
output before headers... Warning: session_start(): Session cannot be started after headers have already been sent in /in/aSTIZ on line 4 But we are still alive!!! Ha! Regardless error reporting
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 output before headers... Warning: session_start(): Session cannot be started after headers have already been sent in /in/aSTIZ on line 4 But we are still alive!!! Ha! Regardless error reporting
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
output before headers... Warning: session_start(): Cannot start session when headers already sent in /in/aSTIZ on line 4 But we are still alive!!! Ha! Regardless error reporting
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.33
output before headers... Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/aSTIZ:3) in /in/aSTIZ on line 4 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/aSTIZ:3) in /in/aSTIZ on line 4 But we are still alive!!! Ha! Regardless error reporting
Output for 4.3.0 - 4.3.1
output before headers... Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cookie - headers already sent by (output started at /in/aSTIZ:3) in /in/aSTIZ on line 4 Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cache limiter - headers already sent (output started at /in/aSTIZ:3) in /in/aSTIZ on line 4 But we are still alive!!! Ha! Regardless error reporting

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