checks its output php v sqlregcase php 6 echo..., PHP String Operation, PHP

Question:Checks it's output
<?php
 $v=sql_regcase("php 6"); echo $v; 
?>

A [Pp][Hh][Pp] 6 
B [P][H][P] 6 
C (Pp)(Hh)(Pp) 6 
D [pP][ hH][ pP] 6

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Question:Checks it's output <?php $v=sql_regcase("php 6"); echo $v; ?>