How do I find last occurence of "needle" in array php

Question

There is a built in function for finding array key for a value - array_search. However as you can see from the example, the function only finds first occurrence, whereas I need the last one:

<?php
$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;
?>

Is there any built in function for this?
If not, can I make a foreach go backwards (from last key to the first one)?

If all the answers are no, I guess this is the only solution:

function array_search_last($needle, $array, $strict = false) {
    $keys = array_keys($array);
    //Not sure how smart PHP is, so I'm trying to avoid IF for every iteration
    if($strict) {
      for($i=count($keys)-1; $i>=0; $i--) {
        //strict search
        if($array[$keys[$i]]===$needle)
          return $keys[$i];
      } 
    }
    else {
      for($i=count($keys)-1; $i>=0; $i--) {
        //benevolent search
        if($array[$keys[$i]]==$needle)
          return $keys[$i];
      } 
    }
}

I'd prefer something better.

Answer 1

But all of them missed one thing, that would cause incorrect results for OP's need, he is seeking for index of last element and reversing array will cause to reindex keys (when numeric), so final solution is to set preserve_keys param to TRUE see docs:

$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$reversed = array_reverse($array, true);

echo array_search('red', $reversed);
// outs 3

Answer 2

array_search('green', array_reverse($array));

Reverse it first, then do your search