3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'hello world!'; $output = ''; for ($i = 0; $i < strlen($string); $i++) { $output .= chr(substr($string, 1, $i)); } echo $output;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: chr(): Argument #1 ($codepoint) must be of type int, string given in /in/II3pY:5 Stack trace: #0 /in/II3pY(5): chr('') #1 {main} thrown in /in/II3pY on line 5
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5 Warning: chr() expects parameter 1 to be int, string given in /in/II3pY on line 5
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, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33

preferences:
241.84 ms | 404 KiB | 460 Q