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<?php system("$PATH") ?>
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 variable $PATH in /in/ZQ4d6 on line 1 Fatal error: Uncaught ValueError: system(): Argument #1 ($command) cannot be empty in /in/ZQ4d6:1 Stack trace: #0 /in/ZQ4d6(1): system('') #1 {main} thrown in /in/ZQ4d6 on line 1
Process exited with code 255.
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: PATH in /in/ZQ4d6 on line 1 Warning: system(): Cannot execute a blank command in /in/ZQ4d6 on line 1
Output for 7.3.32 - 7.3.33
Warning: system(): Cannot execute a blank command in /in/ZQ4d6 on line 1
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
Notice: Undefined variable: PATH in /in/ZQ4d6 on line 1 Warning: system(): Cannot execute a blank command in /in/ZQ4d6 on line 1
Output for 4.3.0 - 4.3.1
Notice: Undefined variable: PATH in /in/ZQ4d6 on line 1 Warning: system() [http://www.php.net/function.system]: Cannot execute a blank command in /in/ZQ4d6 on line 1

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