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@ 2015-04-24T02:36:55Z

<?php
$str = "ˈdɪk ʃəˌnɛr i";
$chrArray = preg_split('//u', $str, -1, PREG_SPLIT_NO_EMPTY);

for($i = 0 ; $i < count($chrArray) ; $i++) {
  if($chrArray[$i] == 'ˈ' || $chrArray[$i] == 'ˌ') $chrArray[$i] = '_';
}

$output = join($chrArray, "");
echo $output;

Output
Performance
VLD
References
Branches

preg_split: documentation ( source)
join: documentation ( source)

preferences:dark modelive preview

38.97 ms | 402 KiB | 5 Q