3v4l.org

run code in 300+ PHP versions simultaneously
<?php header( 'Content-type: text/plain' ); error_reporting(-1); echo 'foo'; session_start(); header( 'Content-encoding: UTF-8' );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
foo Warning: session_start(): Session cannot be started after headers have already been sent in /in/hn73R on line 5 Warning: Cannot modify header information - headers already sent by (output started at /in/hn73R:4) in /in/hn73R on line 6
Output for 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
foo Warning: session_start(): Cannot start session when headers already sent in /in/hn73R on line 5 Warning: Cannot modify header information - headers already sent by (output started at /in/hn73R:4) in /in/hn73R on line 6
Output for 5.2.3 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.23, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
foo Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/hn73R:4) in /in/hn73R on line 5 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/hn73R:4) in /in/hn73R on line 5 Warning: Cannot modify header information - headers already sent by (output started at /in/hn73R:4) in /in/hn73R on line 6
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 - 5.2.2
foo Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/hn73R:4) in /in/hn73R on line 5 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/hn73R:4) in /in/hn73R on line 5
Output for 4.3.0 - 4.3.1
foo Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cookie - headers already sent by (output started at /in/hn73R:4) in /in/hn73R on line 5 Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cache limiter - headers already sent (output started at /in/hn73R:4) in /in/hn73R on line 5

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