How to get the value in an array in php

In PHP, array is a very common data structure. Normally, we often need to get a value in an array in order to use or manipulate it. In this article, I will explain how to get values ​​from an array in PHP.

1. Get the array value through subscript

Each element in the array has a unique subscript, and you can get a certain value in the array through the subscript . The subscript can be a number or a string, depending on the form used when the array is defined.

The following is some sample code that demonstrates how to get the value in the array through the subscript:

//创建一个数字下标数组
$numbers = array(1, 2, 3, 4, 5);

//通过下标获取第一个元素
$first = $numbers[0];
echo $first; //输出1

//创建一个字符串下标数组
$fruits = array("apple" => "red", "banana" => "yellow", "orange" => "orange");

//通过下标获取值
$color = $fruits["banana"];
echo $color; //输出yellow

2. Use a foreach loop to get the array value

Use foreach Looping is a simple way to get all the values ​​in an array. This approach is particularly useful when working with associative arrays (i.e. with more readable string subscripts).

The following is a sample code that uses a foreach loop to obtain an array value:

//创建一个关联数组
$person = array(
    "name" => "John",
    "age" => 30,
    "email" => "john@example.com"
);

//循环遍历数组并输出所有值
foreach($person as $key => $value) {
    echo "$key : $value <br>";
}

//输出：
//name : John
//age : 30
//email : john@example.com

3. Use the array_values() function to obtain an array value

If you just want to get the values ​​in the array and don't care about the key names, you can use PHP's array_values() function to extract all the values ​​from the array.

The following is a sample code to get an array value using the array_values() function:

//创建一个关联数组
$person = array(
    "name" => "John",
    "age" => 30,
    "email" => "john@example.com"
);

//使用 array_values() 函数获取值
$values = array_values($person);

//循环遍历数组并输出所有值
foreach($values as $value) {
    echo "$value <br>";
}

//输出：
//John
//30
//john@example.com

Summary

In PHP, there are many ways to get an array value in . No matter which method you use, you should understand their respective advantages and limitations so that you can use them when appropriate. I hope this article helped you better understand the use of arrays in PHP.

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