Count specific values in multidimensional array

PHP has no support for a SQL where sort of thing, especially not with an array of arrays. But you can do the counting your own while you iterate over the data:

$count = array();
foreach($fruit as $one)
{
    @$count[$one['color']]++;
}

printf("You have %d green fruit(s).\n", $count['green']);

The alternative is to write yourself some little helper function:

/**
 * array_column
 *
 * @param array $array rows - multidimensional
 * @param int|string $key column
 * @return array;
 */
function array_column($array, $key) {
    $column = array();
    foreach($array as $origKey => $value) {
        if (isset($value[$key])) {
            $column[$origKey] = $value[$key];
        }            
    }
    return $column;
}

You then can get all colors:

$colors = array_column($fruit, 'color');

And then count values:

$count = array_count_values($colors);
printf("You have %d green fruit(s).\n", $count['green']);

That kind of helper function often is useful for multidimensional arrays. It is also suggested as a new PHP function for PHP 5.5.

$number_of_green_fruit = 0;
for ($row = 0; $row < 3; $row++) {
    if($fruit[$row]["color"]=="green") {
         $number_of_green_fruit++;
         echo $fruit[$row]["name"] . '<br />';
    }
}

All you need is an extra counter:

for ($row = $number_of_green_fruit = 0; $row < 3; $row++) {
    if($fruit[$row]["color"]=="green") {
         echo $fruit[$row]["name"] . '<br />';
         $number_of_green_fruit++;
    }
}

if($number_of_green_fruit > 1) {
    echo "You have more than 1 piece of green fruit";
}