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@ 2017-10-26T17:01:08Z

<?php

    $res_events = "|2,20171021|1,20171007|2,20171007|1,20171028|2,20171014|1,20171014|2,20171028|1,20171021|";
    $arr = explode("|", $res_events);

    Sort($arr);
    // Remove one of the two empty values in array
    Unset($arr[0]);
    // Implode and add last "|"
    $new =implode("|", $arr)."|";
    Echo $new;

Output
Performance
VLD
References
Branches

explode: documentation ( source)
sort: documentation ( source)

preferences:dark modelive previewkey bindings

43.09 ms | 1694 KiB | 5 Q