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@ 2022-08-05T08:29:55Z

<?php

$str = '11131221133112';

var_export(
    preg_replace(
        '/(\d)\1*\K(?!$)/',
        ' ',
        $str
    )
);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

84.88 ms | 1264 KiB | 5 Q