Question about strpos: how to get 2nd occurrence of a string?

Question

I understand that this function will get the first occurrence of the string.

But what I want is the 2nd occurrence.

How to go about doing that?

Answer 1

To find second occurrence of the string you can use the strpos along with "offset" parameter, by adding previous offset to strpos.

$source = "Hello world, how you doing world...world ?";
$find = "world";
$offset = 0;
$findLength = strlen($find);
$occurrence = 0;

while (($offset = strpos($source, $find, $offset))!== false) {
    if ($occurrence ++) {
      break;
    }
    $offset += $findLength; 
}

echo $offset;

You can find all the occurrences by storing offset into an array

while (($offset = strpos($source, $find, $offset))!== false) {
  $occurrences[] = $offset;
  $offset += $findLength; 
}
var_export($occurrences);

Or can get a specific occurrence by matching $occurrence

//find 3rd occurrence
if ($occurrence ++ == 2) {
    break;
}