How to store a value in an array in php

In PHP, you can use an array to store a set of related values. To store a value in an array, you need to use the assignment syntax of the array. Specifically, arrays in PHP are divided into two types: indexed arrays and associative arrays.

1. Index array

The index array is an array that is automatically indexed starting from 0. Each value has a corresponding numeric index. Using array assignment syntax, a value can be stored in an indexed array.

For example, the following code demonstrates how to store a value into an index array:

// 定义一个空的索引数组
$myArray = array();

// 将一个值存入索引数组中
$myArray[0] = "apple";

In this example, we first define an empty index array$myArray, and then use $myArray[0] = "apple" to store a value "apple" into the array. In an indexed array, each value has a corresponding numeric index, so the index of the first element is 0.

2. Associative array

Associative arrays are OK Use custom key names to store arrays of values, and each value has a corresponding key name. Using array assignment syntax, a value can be stored in an associative array.

For example, the following code demonstrates how to store a value in an associative array:

// 定义一个空的关联数组
$myArray = array();

// 将一个值存入关联数组中
$myArray["fruit"] = "apple";

In this example, we first define an empty associative array$myArray, and then use $myArray["fruit"] = "apple" to combine a value "apple" and a corresponding key name "fruit" Store in array. In an associative array, each value has a corresponding key.

It should be noted that when using the array assignment syntax to store a value in an associative array, the key name can be any string or integer. However, when using array assignment syntax to store a value into an indexed array, the key must be an integer.

Summary

In PHP, by using the assignment syntax of the array, you can store a value in an indexed array or an associative array. When storing a value, you need to first define an empty array, and then use the array assignment syntax to store a value into the array. In an associative array, the key name can be any string or integer, while in an indexed array, the key name must be an integer.

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