3v4l.org

run code in 500+ PHP versions simultaneously
<?php declare(strict_types = 1); $handle = fopen(__FILE__, 'r'); var_dump(flock($handle, LOCK_EX|LOCK_SH)); // only LOCK_SH is honored - php should throw here var_dump(file_get_contents(__FILE__));
Output for 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
bool(true) string(198) "<?php declare(strict_types = 1); $handle = fopen(__FILE__, 'r'); var_dump(flock($handle, LOCK_EX|LOCK_SH)); // only LOCK_SH is honored - php should throw here var_dump(file_get_contents(__FILE__));"

preferences:
73.75 ms | 902 KiB | 4 Q