Converting all underscore connected letters to uppercase in php

Question

I have a string like "kp_o_zmq_k" and I need to covert it to "kpOZmqK" where I need to convert all letters connected to the right of the underscore(o,z,k in this case) to uppercase.

You mean, you want to convert letters that have a preceding underscore to upper-case? — Brad, Mar 08 '13 at 04:16
Because simply 'connected' would imply that p and q should also be upper-case. — aqua, Mar 08 '13 at 04:17
What is supposed to happen if you have two underscores in a row? Something like `sadf__ety__hjk` — PriestVallon, Mar 08 '13 at 04:19
Yes, I want to convert letters preceding underscore to uppercase — Abhiraj, Mar 08 '13 at 06:27

score 7 · Answer 1 · answered Mar 08 '13 at 04:21

7

<?php
function underscore2Camelcase($str) {
  // Split string in words.
  $words = explode('_', strtolower($str));

  $return = '';
  foreach ($words as $word) {
    $return .= ucfirst(trim($word));
  }

  return $return;
}
?>

answered Mar 08 '13 at 04:21

dimirc

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score 2 · Accepted Answer · answered Mar 08 '13 at 04:34

Try with preg_replace_callback function in php.

$ptn = "/_[a-z]?/";
$str = "kp_o_zmq_k";
$result = preg_replace_callback($ptn,"callbackhandler",$str);
// print the result
echo $result;

function callbackhandler($matches) {
    return strtoupper(ltrim($matches[0], "_"));
}

Converting all underscore connected letters to uppercase in php

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