関連ワード:  php check if array has unique values    php check if array contains multiple values    php check if array has values    php check if array has duplicate values    php check if array has empty values    php check if array has null values    php check if array has same values    php check if array has any values    php check if array has no values    php check if array has non empty values  
結果 : php check if array has different values