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phpstrpos

How to find numbers that only appears once in a string?

Let's say I have input string

String 1 : 1234123
String 2 : 76523752

From those string, I'd like to know which numbers that only appears once. So in my case the output should be 

String 1 : array(4)
String 2 : array(6,3)

I'm guessing I'll use strpos() for this task but I couldn't get any logical flow to make this happen. Can you help me figure this out?

Solution

  • Boring solution but it works!

    $string="1234123";
$result=array();
foreach (count_chars($string, 1) as $i => $val) {
     if($val==1) $result[]=chr($i);
}
print_r($result);