How to write two-dimensional array in php

PHP is a widely used back-end programming language. Its flexibility and easy-to-use features make it widely popular in development. In PHP, array is an important data type, and PHP provides a variety of ways to operate arrays. Among them, two-dimensional arrays are what we often use. They can store more complex and multi-dimensional data. So, how to write two-dimensional arrays correctly in PHP? The following article will introduce it to you in detail.

1. Define a two-dimensional array

When defining a two-dimensional array, we can use two methods, namely using the array() function and using []. The details are as follows:

1. Use array() function

$array = array(
               array(1,2,3),
               array('a','b','c'),
             );

2. Use []

$array = [
          [1,2,3],
          ['a','b','c']
         ];

2. Access two-dimensional array elements

In PHP, we can use two indexes to access elements in the two-dimensional array, as follows:

$array = [
          [1,2,3],
          ['a','b','c']
         ];
echo $array[0][0];//访问第一个元素，结果为1
echo $array[1][2];//访问第二个元素的第三个元素，结果为c

3. Traverse the two-dimensional array

In PHP, we can use The foreach statement is used to traverse the two-dimensional array, as follows:

$array = [
          [1,2,3],
          ['a','b','c']
         ];
foreach($array as $row){
    foreach($row as $col){
        echo $col." ";
    }
    echo "<br>";
}

In the above code, the first foreach statement is used to traverse each row, and the second foreach statement is used to traverse each element.

4. Adding and deleting two-dimensional array elements

In PHP, we can use array_push(), array_pop(), array_unshift() and array_shift() functions to add or delete two-dimensional Array elements. The details are as follows:

1. Add elements

$array = [
          [1,2,3],
          ['a','b','c']
         ];
array_push($array[0], 4);//往第一个元素的末尾添加一个元素
array_unshift($array[1], 'd');//往第二个元素的开头添加一个元素

2. Delete elements

$array = [
          [1,2,3],
          ['a','b','c']
         ];
array_pop($array[0]);//删除第一个元素的末尾元素
array_shift($array[1]);//删除第二个元素的开头元素

5. Summary

Two-dimensional arrays are widely used in PHP . In this article, we provide a detailed introduction to how to define, access, traverse, add and delete two-dimensional array elements. I hope this article can help everyone master two-dimensional arrays in PHP.

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