How to assign value to array in php

PHP is a powerful server-side scripting language that can be used to develop dynamic websites and applications. In PHP, array is a very common data type that can store multiple variables, which can be of different data types, such as strings, numbers, and Boolean values. In this article, we will explain in detail how to do array assignment using PHP.

1. Assignment of numeric index array

Numeric index array is the most commonly used array type in PHP, which can store a set of variables in positional order. Create a numerically indexed array by using the array() function, where each element has a unique numerical index. We can assign different types of values ​​to numerically indexed arrays using the following syntax:

<?php // 创建一个数字索引数组
$array = array("apple", "orange", "banana");

// 使用赋值语句将新值添加到数组
$array[3] = "grape"; // 将"grape"添加到数组尾部
$array[0] = "peach"; // 替换位置0的元素为"peach"
?>

The above code will create an array of 3 elements, each element has a numerical index, starting from 0 and increasing. We add new values ​​to the array one by one using assignment statements. In the first example, we add "grape" to the end of the array. In the second example, we replace the element at original position 0 with "peach".

2. Associative array assignment

Associative array is another common array type in PHP, which can be used to store key-value pairs. In an associative array, each element has a unique key (of type string) and its corresponding value. We can use the following syntax to assign different types of values ​​to associative arrays:

<?php // 创建一个关联数组
$array = array("name" => "John", "age" => 30, "gender" => "male");

// 使用赋值语句更新数组元素值
$array["age"] = 40; // 更新"age"键对应的值为40
$array["job"] = "developer"; // 向数组中添加新键值对
?>

The above code will create an associative array containing 3 key-value pairs. Each element has a string key and its corresponding value. We use assignment statements to update the array element values ​​one by one. In the first example, we update the value corresponding to the "age" key to 40. In the second example, we will add a new key-value pair "job" => "developer".

3. Assignment of multidimensional arrays

Multidimensional array is a special array type in PHP, which can nest other arrays as elements. In a multidimensional array, each element can be a numerically indexed array or an associative array. We can assign different types of values ​​to multidimensional arrays using the following syntax:

<?php // 创建一个多维数组
$array = array(
    "fruit" => array("apple", "orange", "banana"),
    "person" => array("name" => "John", "age" => 30, "gender" => "male")
);

// 使用赋值语句更新数组元素值
$array["fruit"][2] = "grape"; // 更新内部数字索引数组元素值
$array["person"]["age"] = 40; // 更新内部关联数组元素值
$array["animal"] = array("cat", "dog", "bird"); // 向数组中添加新键值对
?>

The above code will create a multidimensional array containing two elements. The first element is a numerically indexed array named "fruit" containing 3 string elements. The second element is an associative array named "person" and contains 3 key-value pairs. We use assignment statements to update the array element values ​​one by one. In the first example, we assign "grape" to the 3rd element of the internal numerical index array. In the second example, we update the value corresponding to the "age" key to 40. In the third example, we will add a new key-value pair "animal" => array("cat", "dog", "bird").

Summary

Array is a very common and practical data type in PHP. Whether it is a numerically indexed array, an associative array, or a multidimensional array, we can update array element values ​​through a simple assignment statement. Proficient in array operation skills will make us more comfortable in the actual development process.

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