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Searching and Counting

array_key_exists($m,$arr) returns true if the key $m can be found in $arr. in_array ($m, $arr[,$b=false])  returns true if the value $m can be found in $arr. If $b is true, the types are also compared. array_search($m,$arr[,$b=false]) returns the first matching key of the value $m. FALSE is returned if the value does not exist. If $b is true, the types are also compared. count($arr[,$i]) or sizeof($arr[,$i]) returns the number of elements in $arr. If $i is set to COUNT_RECURSIVE, the elements in sub arrays will be counted as well. array_count_values($arr) returns an array which uses the values of $arr as keys, and their frequencies as values. 

<!DOCTYPE html><html><head></head>
<body>
<?php
$a=["hello",1,1,"hello",1,2];
print_r(array_count_values($a));
?> 
</body></html>

Array ( [hello] => 2 [1] => 3 [2] => 1 )