Convert a special sign to HTML Tag

creatSpanTag.php

<?php
function Convert_to_htmlTag($string, $tagSign='|') {
    $firstSign = strpos($string, $tagSign);
    $lastSign = strpos($string, $tagSign, $firstSign+1);
    $strArray = str_split($string);
    $replaceSigns = array($firstSign=>'<span class="se-s-color">', $lastSign=>'</span>');
    $replaceSigns = array_replace($strArray, $replaceSigns);
    echo implode($replaceSigns);
}