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@ 2019-01-02T05:13:17Z

<?php

$strArr = str_split('AGHIJKLAL');

$temp = [];
foreach($strArr as $v){
    if(in_array($v, $temp)){
        $repeatChar = $v;
        break;
    }else{
        $temp[] = $v;
    }
}
echo $repeatChar;

Output
Performance
VLD
References
Branches

in_array: documentation ( source)
str_split: documentation ( source)

preferences:dark modelive previewkey bindings

31.71 ms | 405 KiB | 5 Q