<?php function convert_case($name) { return implode( '_', array_map( 'strtolower', preg_split('/([A-Z][^A-Z]*)/', $name, null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY) ) ); } echo json_encode(array_map("convert_case", array("FooBar", "FooBAR")), JSON_PRETTY_PRINT);
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