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<?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( $matches );
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 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(2) { [0]=> array(3) { [0]=> string(3) "max" [1]=> string(4) "File" [2]=> string(4) "Size" } [1]=> array(3) { [0]=> string(3) "max" [1]=> string(4) "File" [2]=> string(4) "Size" } }

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276.75 ms | 406 KiB | 349 Q