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<?php var_dump(str_pad("3",5, ""));
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
Fatal error: Uncaught ValueError: str_pad(): Argument #3 ($pad_string) must be a non-empty string in /in/indJE:3 Stack trace: #0 /in/indJE(3): str_pad('3', 5, '') #1 {main} thrown in /in/indJE on line 3
Process exited with code 255.
Output for 5.2.5 - 5.2.17, 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 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: str_pad(): Padding string cannot be empty in /in/indJE on line 3 NULL
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 - 5.2.4
Warning: str_pad(): Padding string cannot be empty. in /in/indJE on line 3 NULL
Output for 4.3.0 - 4.3.1
Warning: str_pad() [http://www.php.net/function.str-pad]: Padding string cannot be empty. in /in/indJE on line 3 NULL

preferences:
236.28 ms | 402 KiB | 344 Q