Replace Second Instance of String

Question

Hey, I just wondering how I could replace the second instance of a string inside a string in php such as follows:

a - b - c

Where it would add an extra space after the second "-" but only if it finds 2.

Thanks

Answer 1

Substring the string starting at the index of the first dash using strpos then do a str_replace on the rest of the string. Concatenate the two together.

Answer 2

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

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

Answer 3

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