problem in array

[nerya]

i have array like that

111c6,vvvc6222,c6c6,444c6

i want to get the last indax that include the string "c6"

how can i do this please????

now it need to be "4"

 

array_search is not good because array_search get only 1 index' and in my problem i have 4 index

[ignace]

$search = 'c6';
$str = '111c6,vvvc6222,c6c6,444c6';
$parts = explode(',', $str);
$sizeof = sizeof($parts);
for ($i = $sizeof - 1; $i >= 0; --$i) {
    if (false !== strpos($str, $parts[$i])) {
        print $parts[$i]; break;
    }
}

[RussellReal]

<?php
function getLastIndex($a,$s) {
	$a = array_reverse($a,true);
	foreach ($a as $k => $v) {
		if (strpos($v,$s) !== false) return $k;
	}
	return false;
}
$array = array('abcd1','cdef','gpd1');
$key = getLastIndex($array,'d1');
// $key should equal 2
?>