3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'a b'; $c1 = substr($string, 1, 1); $c2 = mb_substr($string, 1, 1); $c3 = iconv_substr($string, 1, 1); var_dump($c1, $c2, $c3);
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
string(1) " " string(1) " " string(1) " "
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(1) " " string(1) " " string(1) " "
Output for 7.3.32 - 7.3.33, 7.4.33, 8.0.13
Fatal error: Uncaught Error: Call to undefined function iconv_substr() in /in/RQ8EM:6 Stack trace: #0 {main} thrown in /in/RQ8EM on line 6
Process exited with code 255.
preferences:
168.05 ms | 401 KiB | 171 Q