Multiple replace (probably preg_replace) of same string with array

Question

I need to replace multiple instances of a certain string (question mark) with strings from an array. e.g. if the string I wish to replace appears 3 times and my array has a

Answer 1

It gets a little ugly in PHP 5.2 because you have to use global variables to pass information between callbacks but it's very flexible otherwise. Use preg_replace_callback():

preg_replace_callback('!\?!', 'rep_array', $myString);

$i = 0;

function rep_array($matches) {
  global $myArray;
  return $myArray[$i++];
}

You'd have to cater for there being more ?s than array entries as well as reset the counter with each call.

Adam is right about sprintf() being somewhat cleaner but you don't always control the input string. preg_replace_callback can cater for a far wider range of circumstances.

Answer 2

why not use

$retString = vsprintf('banana is %s, apple is %s, tomato is %s', $myArray);  
return $retString;