Làm thế nào tôi có thể viết mảng trong php?

Mảng trong PHP là một kiểu cấu trúc dữ liệu cho phép chúng ta lưu trữ nhiều phần tử có kiểu dữ liệu giống nhau dưới một biến duy nhất, do đó tiết kiệm công sức tạo một biến khác cho mỗi dữ liệu. Các mảng rất hữu ích để tạo danh sách các phần tử có kiểu tương tự, có thể được truy cập bằng chỉ mục hoặc khóa của chúng. Giả sử chúng tôi muốn lưu trữ năm tên và in chúng theo đó. Điều này có thể dễ dàng thực hiện bằng cách sử dụng năm biến chuỗi khác nhau. Nhưng nếu thay vì năm, con số tăng lên hàng trăm, thì người dùng hoặc nhà phát triển sẽ thực sự khó tạo ra nhiều biến khác nhau như vậy. Ở đây, mảng phát huy tác dụng và giúp chúng ta lưu trữ mọi phần tử trong một biến duy nhất và cũng cho phép truy cập dễ dàng bằng chỉ mục hoặc khóa. Mảng được tạo bằng hàm array() trong PHP

Về cơ bản có ba loại mảng trong PHP.  

  • Mảng được lập chỉ mục hoặc số. Một mảng có chỉ mục số trong đó các giá trị được lưu trữ tuyến tính
  • Mảng kết hợp. Một mảng có chỉ mục chuỗi trong đó thay vì lưu trữ tuyến tính, mỗi giá trị có thể được gán một khóa cụ thể
  • Mảng đa chiều. Một mảng chứa một hoặc nhiều mảng bên trong nó và có thể được truy cập thông qua nhiều chỉ mục

Mảng được lập chỉ mục hoặc số

Các loại mảng này có thể được sử dụng để lưu trữ bất kỳ loại phần tử nào, nhưng chỉ mục luôn là một số. Theo mặc định, chỉ mục bắt đầu từ số không. Các mảng này có thể được tạo theo hai cách khác nhau như trong ví dụ sau.  

PHP




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đi ngang qua. Chúng ta có thể duyệt qua một mảng được lập chỉ mục bằng cách sử dụng các vòng lặp trong PHP. Chúng ta có thể lặp qua mảng được lập chỉ mục theo hai cách. Đầu tiên bằng cách sử dụng vòng lặp for và thứ hai bằng cách sử dụng foreach. Bạn có thể tham khảo PHP. Vòng lặp cho cú pháp và sử dụng cơ bản.  

Thí dụ.   

PHP




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Looping using foreach: 
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Looping using foreach: 
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Mảng kết hợp

Các loại mảng này tương tự như các mảng được lập chỉ mục nhưng thay vì lưu trữ tuyến tính, mọi giá trị có thể được gán bằng khóa do người dùng xác định thuộc loại chuỗi.  

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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
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ANTHONY
RAM
SALIM
RAGHAV
0

Đi qua các mảng kết hợp. Chúng ta có thể duyệt qua các mảng kết hợp theo cách tương tự đã làm trong các mảng số bằng cách sử dụng các vòng lặp. Chúng ta có thể lặp qua mảng kết hợp theo hai cách. Đầu tiên bằng cách sử dụng vòng lặp for và thứ hai bằng cách sử dụng foreach. Bạn có thể tham khảo PHP. Vòng lặp cho cú pháp và sử dụng cơ bản.  

Thí dụ.   

PHP




Looping using foreach: 
Zack
Anthony
Ram
Salim
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The number of elements is 5 
Looping using for: 
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ANTHONY
RAM
SALIM
RAGHAV
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Looping using foreach: 
Zack
Anthony
Ram
Salim
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The number of elements is 5 
Looping using for: 
ZACK
ANTHONY
RAM
SALIM
RAGHAV
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Looping using foreach: 
Zack
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Ram
Salim
Raghav

The number of elements is 5 
Looping using for: 
ZACK
ANTHONY
RAM
SALIM
RAGHAV
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Looping using foreach: 
Zack
Anthony
Ram
Salim
Raghav

The number of elements is 5 
Looping using for: 
ZACK
ANTHONY
RAM
SALIM
RAGHAV
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Looping using foreach: 
Zack
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Salim
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The number of elements is 5 
Looping using for: 
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ANTHONY
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RAGHAV
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Looping using foreach: 
Zack
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Ram
Salim
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The number of elements is 5 
Looping using for: 
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RAM
SALIM
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Looping using foreach: 
Zack
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Salim
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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SALIM
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
Zack
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Ram
Salim
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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SALIM
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Looping using foreach: 
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Salim
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The number of elements is 5 
Looping using for: 
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ANTHONY
RAM
SALIM
RAGHAV
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Looping using foreach: 
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Ram
Salim
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The number of elements is 5 
Looping using for: 
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ANTHONY
RAM
SALIM
RAGHAV
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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SALIM
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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RAM
SALIM
RAGHAV
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Looping using foreach: 
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Salim
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The number of elements is 5 
Looping using for: 
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RAM
SALIM
RAGHAV
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Looping using foreach: 
Zack
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Ram
Salim
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The number of elements is 5 
Looping using for: 
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RAM
SALIM
RAGHAV
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Looping using foreach: 
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Salim
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The number of elements is 5 
Looping using for: 
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SALIM
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Looping using foreach: 
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Salim
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The number of elements is 5 
Looping using for: 
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ANTHONY
RAM
SALIM
RAGHAV
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Looping using foreach: 
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Salim
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The number of elements is 5 
Looping using for: 
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RAM
SALIM
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Mảng đa chiều

Mảng nhiều chiều là những mảng lưu trữ một mảng khác tại mỗi chỉ mục thay vì một phần tử. Nói cách khác, chúng ta có thể định nghĩa mảng nhiều chiều là một mảng của các mảng. Như tên gợi ý, mọi phần tử trong mảng này có thể là một mảng và chúng cũng có thể chứa các mảng con khác bên trong. Mảng hoặc mảng con trong mảng đa chiều có thể được truy cập bằng nhiều chiều.  

Thí dụ.   

PHP




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đầu ra.  

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Di chuyển mảng đa chiều. Chúng ta có thể duyệt qua mảng nhiều chiều bằng cách sử dụng vòng lặp for và foreach theo cách lồng nhau. Tức là, một vòng lặp for cho mảng bên ngoài và một vòng lặp for cho mảng bên trong

Thí dụ.   

PHP




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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
Looping using for: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
Looping using for: 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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The number of elements is 5 
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Looping using foreach: 
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Looping using foreach: 
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