PHP Count by sub-array Key & Value

php_count_by_subarray_key_value.php

<?php
//Source http://stackoverflow.com/questions/13329621/count-sub-elements-of-an-array-in-php

function array_count ($array, $key, $value = NULL) {
    // count($array[*][$key])
    $c = 0;
    if (is_null($value)) {
        foreach ($array as $i=>$subarray) {
            $c += ($subarray[$key]!='');
        }
    } else {
        foreach ($array as $i=>$subarray) {
            $c += ($subarray[$key]==$value);
        }
    }
    return $c;
}

Example:
// assume $foo is an array of 100 arrays, 
// of which 20 sub-arrays have a blank 'description', 
// and 35 have 'is_active' set to 'Y' and 65 set to 'N'

echo array_count ($foo, 'description'); // ... 80 non-blanks
echo array_count ($foo, 'is_active'); // ... 100 non-blanks
echo array_count ($foo, 'is_active', 'Y'); // ... 35 matches
echo array_count ($foo, 'description', ''); // ... 20 is-blanks