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@ 2017-09-21T13:57:52Z

<?php

    $string = '3:1,1:2,2:3';
    $string = str_replace('1:2', '1:whateverToReplaceWith', $string);
    echo $string;

Output
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str_replace: documentation ( source)

preferences:dark modelive preview

51.48 ms | 404 KiB | 5 Q