检查会话数组是否有特定值

function CHECKITEMEXIST($cartarray, $sub){
    foreach ($cartarray as $item){
        foreach ($item as $item2){
            if($item2['subject'] = $sub){
                return '1';

            }else{
                return '0';
            }
        }
    }
}

$subject = "English";
    $checkitemexist = CHECKITEMEXIST($cart, $subject);

if($checkitemexist > 0){
    echo "Yes";
}else{
    echo "No";
}

Guys I have the function below to check my cart array to see whether english subject exist or not, but the problem is even when english isn't in the cart array it will still return yes result, why is that so?

Below are the sample cart array.

Array ( [0] => Array ( [0] => Array ( [subject] => science ) ) )

make it correct

if($item2['subject'] = $sub){   // = is an assignment operator

to

if($item2['subject'] == $sub){  // == is a comparison operator

UPDATE 2 :

try your modified function

function CHECKITEMEXIST($cartarray, $sub){
$flag = 0;
    foreach ($cartarray as $item){
        foreach ($item as $item2){
            if($item2['subject'] == $sub){
                $flag = 1;
            break;
            }
        }
        if($flag==1)
        {
            break;
        } 
    }
return $flag;   
}