3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "HTTP_ACCEPT_LANGUAGE" in /in/CJPJM on line 3 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /in/CJPJM on line 3
Output for 8.0.0 - 8.0.30
Warning: Undefined array key "HTTP_ACCEPT_LANGUAGE" in /in/CJPJM on line 3
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined index: HTTP_ACCEPT_LANGUAGE in /in/CJPJM on line 3
Output for 7.3.32 - 7.3.33
Output for 4.3.0 - 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
Notice: Undefined index: HTTP_ACCEPT_LANGUAGE in /in/CJPJM on line 3

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233.02 ms | 402 KiB | 327 Q