function count_appearances($arr, $s) {
$count = 0;
foreach ($arr as $key => $value) {
if ($value == $s) {
$count++;
}
}
return $count;
}
$arr = array("a"=>"php", "b"=>"java", "c"=>"php", "d"=>"python", "e"=>"php");
echo count_appearances($arr, "php");
/*
run:
3
*/