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@ 2023-11-23T22:25:25Z

<?php

$array = ["a", "b", "a", "c"];

var_export(
    array_map(
        function ($v) {
            static $lookup = [];
            $lookup[$v] ??= 0;
            return $v . ($lookup[$v]++ ?: '');
        },
        $array
    )
);

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

33.53 ms | 405 KiB | 5 Q