3v4l.org

run code in 300+ PHP versions simultaneously
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Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5
cli Warning: session_start(): Session cannot be started after headers have already been sent in /in/CYsUm on line 3 Warning: Cannot modify header information - headers already sent by (output started at /in/CYsUm:2) in /in/CYsUm on line 4 Warning: Cannot modify header information - headers already sent by (output started at /in/CYsUm:2) in /in/CYsUm on line 5
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
cli Warning: session_start(): Cannot start session when headers already sent in /in/CYsUm on line 3 Warning: Cannot modify header information - headers already sent by (output started at /in/CYsUm:2) in /in/CYsUm on line 4 Warning: Cannot modify header information - headers already sent by (output started at /in/CYsUm:2) in /in/CYsUm on line 5
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
cli Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/CYsUm:2) in /in/CYsUm on line 3 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/CYsUm:2) in /in/CYsUm on line 3 Warning: Cannot modify header information - headers already sent by (output started at /in/CYsUm:2) in /in/CYsUm on line 4 Warning: Cannot modify header information - headers already sent by (output started at /in/CYsUm:2) in /in/CYsUm on line 5

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