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run code in 300+ PHP versions simultaneously
<?php echo "Your User Agent is :" . $_SERVER ['HTTP_USER_AGENT'];
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
Warning: Undefined array key "HTTP_USER_AGENT" in /in/pbTgT on line 2 Your User Agent is :
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined index: HTTP_USER_AGENT in /in/pbTgT on line 2 Your User Agent is :
Output for 7.3.32 - 7.3.33
Your User Agent is :
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_USER_AGENT in /in/pbTgT on line 2 Your User Agent is :

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227.11 ms | 402 KiB | 342 Q