3v4l.org

run code in 300+ PHP versions simultaneously
<?php $option = 'maxFileSize'; preg_match_all( '#((?:^|[A-Z])[a-z]+)#', $option, $matches ); if ( isset( $matches[1] ) && strlen( strtolower( implode( '_', $matches[1] ) ) ) >= strlen( $option ) ) { $option = strtolower( implode( '_', $matches[1] ) ); } var_dump( $option );
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, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(13) "max_file_size"

preferences:
290.15 ms | 405 KiB | 456 Q