Question

我是php的新手。我试图使用下面的递归静态函数，但在我的代码中执行时，我收到错误：

PHP致命错误：在第36行的myutil.php中调用未定义的函数seekKey（）static function seekKey($haystack, $needle) { $valuesArray=null; foreach($haystack as $key => $value){ if($key === $needle){ $valuesArray[] = $value; }elseif(is_array($value)){ self::seekKey($value, $needle); } } $valuesArray = array_merge($valuesArray, seekKey($value, $needle)); return $valuesArray; }

func createAddressBook() -> Bool {
    if self.addressBook != nil {
        return true
    }
    var err : Unmanaged<CFError>? = nil
    let addressBook : ABAddressBook? = ABAddressBookCreateWithOptions(nil, &err).takeRetainedValue()
    if addressBook == nil {
        println(err)
        self.addressBook = nil
        return false
    }
    self.addressBook = addressBook
    getContactNames()
    return true
}

func getContactNames() {
    if !self.determineStatus() {
        println("not authorized")
        return
    }
    let people = ABAddressBookCopyArrayOfAllPeople(addressBook).takeRetainedValue() as NSArray as [ABRecord]
    for person in people {
        var contactName = ABRecordCopyCompositeName(person).takeRetainedValue() as String
        self.contacts.append(contact(name: contactName))
    }
}

请告诉我在上面的代码中需要更改的内容？

Answer 1

假设seekKey()是类中的静态方法，那么您需要self::seekKey($value, $needle);但是当seekKey()返回一个值时，您需要在调用它时对该返回值执行某些操作递归地......也许$valuesArray = array_merge($valuesArray, seekKey($value, $needle));

static function seekKey($haystack, $needle)
{
    $valuesArray=[];

    foreach($haystack as $key => $value){
        if($key === $needle){
            $valuesArray[] = $value; 
        }elseif(is_array($value)){
            $valuesArray = array_merge($valuesArray, self::seekKey($value, $needle));
        }
    }

    return $valuesArray;
}

php递归静态函数问题

1 个答案: