Quá tải hàm tạo PHP
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Việc giải thích nạp chồng là khác trong PHP so với các ngôn ngữ hướng đối tượng khác như C++ hoặc Java trong đó thuật ngữ này có nghĩa là khả năng có một lớp với phương thức cùng tên nhiều lần nhưng với các đối số và/hoặc kiểu trả về khác nhau. Mặt khác, trong PHP, tính năng tạo động các thuộc tính và phương thức được gọi là quá tải. Các phương thức ma thuật PHP (tên phương thức bắt đầu bằng dấu gạch dưới kép) được sử dụng để thiết lập các thuộc tính và phương thức động Show Các phương thức ma thuật sau đây được sử dụng để nạp chồng các thuộc tính - cú pháppublic __set ( string $name , mixed $value ) : void public __get ( string $name ) : mixed public __isset ( string $name ) : bool public __unset ( string $name ) : void __set() được chạy để ghi dữ liệu vào các thuộc tính không thể truy cập được bảo vệ hoặc riêng tư hoặc không tồn tại Trình xây dựng là các hàm thành viên đặc biệt dành cho cài đặt ban đầu của các thể hiện đối tượng mới được tạo từ một lớp. Trong PHP, constructor là một phương thức có tên __construct(), được gọi bởi từ khóa new sau khi tạo đối tượng. Các hàm tạo cũng có thể chấp nhận các đối số, trong trường hợp đó, khi câu lệnh mới được viết, bạn cũng cần gửi các đối số của hàm tạo cho các tham số Các nhà xây dựng là các khối xây dựng cơ bản xác định đối tượng tương lai và bản chất của nó. Bạn có thể nói rằng Trình xây dựng là bản thiết kế để tạo đối tượng cung cấp các giá trị cho hàm thành viên và biến thành viên Các loại hàm tạo
Ghi chú. PHP thiếu hỗ trợ khai báo nhiều hàm tạo với số lượng tham số khác nhau cho một lớp không giống như các ngôn ngữ như Java Nhiều nhà xây dựng. Có sẵn nhiều hơn một hàm tạo trong một lớp để khởi tạo các thể hiện ví dụ 1. Trong ví dụ sau, chúng tôi tạo một tập lệnh và cố gắng khai báo nhiều hàm tạo. Chúng tôi sẽ gán tên của một sinh viên bằng cách sử dụng một hàm tạo và tuổi với một hàm tạo khác PHPConstructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh4 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh5 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh6 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh9 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh0 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh1 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh2 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh3 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh4 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh5 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh8 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Name is initialized using constructor ID : 1 Name : Akshit ID is initialized using constructor ID : 2 Name : Nikita0 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh0 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh1 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh2_______13 Name is initialized using constructor ID : 1 Name : Akshit ID is initialized using constructor ID : 2 Name : Nikita6 Name is initialized using constructor ID : 1 Name : Akshit ID is initialized using constructor ID : 2 Name : Nikita7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh4 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh5 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh7 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh8 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh44 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh45 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh46 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh47 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh48 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh49 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh50 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh45 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh46 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh47 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh48 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh55 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh56 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh49 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh8 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh59 đầu ra Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh2 Chúng ta phải sử dụng các phương thức khác nhau để sử dụng Nhiều hàm tạo trong PHP. Một số được liệt kê dưới đây Tiếp cận
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Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh1 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh76 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh69 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh55 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh79 Constructor with 1 parameter called: Akshit Constructor with 2 parameters called: Akshit,Nikita Constructor with 3 parameters called: Akshit,Nikita,Ritesh4 ________ 871 ________ 872 ________ 893 Constructor with 1 parameter called: Akshit Constructor 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ví dụ 3. Ví dụ sau minh họa nhiều hàm tạo với các kiểu dữ liệu khác nhau như chuỗi hoặc số nguyên Chúng ta có thể quá tải hàm tạo trong PHP không?Không có phương pháp nạp chồng hàm tạo đơn giản nào trong PHP .
Có thể quá tải trong PHP không?PHP không hỗ trợ nạp chồng phương thức . Trong trường hợp bạn chưa bao giờ nghe nói về nạp chồng phương thức, điều đó có nghĩa là ngôn ngữ có thể chọn phương thức dựa trên tham số bạn đang sử dụng để gọi phương thức đó. Điều này có thể thực hiện được ở nhiều ngôn ngữ lập trình khác như Java, C++.
Bạn có thể quá tải một hàm tạo không?Constructor có thể được nạp chồng theo cách tương tự như nạp chồng hàm . Các hàm tạo quá tải có cùng tên (tên của lớp) nhưng số lượng đối số khác nhau. Tùy thuộc vào số lượng và loại đối số được truyền, hàm tạo tương ứng được gọi.
Một hàm tạo quá tải là gì?Nạp chồng hàm tạo trong Java đề cập đến việc sử dụng nhiều hơn một hàm tạo trong một lớp thể hiện . Tuy nhiên, mỗi hàm tạo quá tải phải có các chữ ký khác nhau. Để quá trình biên dịch thành công, mỗi hàm tạo phải chứa một danh sách các đối số khác nhau. |
