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<?php $strArr = str_split('AGHIJKLAL'); print_r($strArr); $temp = []; foreach($strArr as $v){ if(in_array($v, $temp)){ $repeatChar = $v; break; }else{ $temp[] = $v; } } echo $repeatChar;
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => A [1] => G [2] => H [3] => I [4] => J [5] => K [6] => L [7] => A [8] => L ) A

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