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<?php echo "Your User Agent is :" . $_SERVER ['HTTP_USER_AGENT']; ?> - See more at: http://www.w3resource.com/php-exercises/php-basic-exercises.php#sthash.BzJmdp5O.dpuf
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "HTTP_USER_AGENT" in /in/Pg6jH on line 2 Your User Agent is : - See more at: http://www.w3resource.com/php-exercises/php-basic-exercises.php#sthash.BzJmdp5O.dpuf
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 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined index: HTTP_USER_AGENT in /in/Pg6jH on line 2 Your User Agent is : - See more at: http://www.w3resource.com/php-exercises/php-basic-exercises.php#sthash.BzJmdp5O.dpuf
Output for 7.3.32 - 7.3.33
Your User Agent is : - See more at: http://www.w3resource.com/php-exercises/php-basic-exercises.php#sthash.BzJmdp5O.dpuf
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/Pg6jH on line 2 Your User Agent is : - See more at: http://www.w3resource.com/php-exercises/php-basic-exercises.php#sthash.BzJmdp5O.dpuf

preferences:
216.52 ms | 402 KiB | 315 Q