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@ 2019-07-17T09:51:35Z

<?php
$arr   = ["{A}", "{B}", "{C}", "{A}"];
$start = '<span class="c">';
$end   = '</span>';
$string = "{A}{B}{C}{A}";

foreach (array_unique($arr) as $item) {
    $string = str_replace($item, $start . $item . $end, $string);
}

echo $string;

Output
Performance
VLD
References
Branches

str_replace: documentation ( source)
array_unique: documentation ( source)

preferences:dark modelive preview

61.17 ms | 402 KiB | 5 Q