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How to get the common sub string in two string?

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<?php
function retriveCalc($str1,$str2){
    $arr1=array();
    for($i=0;strlen($str1)>$i;$i++){
        $arr1[$i]=$str1[$i];
    }
    $arr2=array();
    for($i=0;strlen($str1)>$i;$i++){
        $arr2[$i]=$str1[$i];
    }
    $result = array_intersect($arr1,$arr2);
    return implode('',$result);
}
$str1='test';
$str2='testingindia';
echo retriveCalc($str1,$str2);
echo "<br>";
$str1='1234';
$str2='4254546234231';
echo retriveCalc($str1,$str2);
?>

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