Replace second row instance

Question

I'm just wondering how I can replace the second instance of a string inside a string in php, for example:

a - b - c

Where he will add extra space after the second " -", but only if he finds 2.

Answer 1

$finds = explode('-', "a - b - c");
if (count($finds) == 3) {
  $finds[2] = " {$finds[2]}";
}

$finds = implode('-', $finds);

Answer 2

$str ="a - b - c";    
if (substr_count($str,"-")>2){
  print preg_replace("/^(.*)-(.*)-(.*)/","\\1-\\2- \\3",$str);
}

Answer 3

**// User Function to replace string by Occurance**

function str_occ_replace($from,$to,$subject,$occ){
    $myArray = explode($from,$subject);
    print_r($myArray);
    $mystring = '';
    $index = 1;
    foreach($myArray as $ele){

        if($index !== $occ AND $index !== $arraySize)
            $mystring .= $ele.$from;
        else if($index !== $arraySize)
            $mystring .= $ele.$to;
        $index++;
    } // End of Foreach
    return $mystring;
} // End of Function

Answer 4

Trim the line starting at the index of the first dash using strpos, then do str_replacethe rest of the line. Put them together.