How to assign value to variable in php array

In PHP programming, array is a very common and useful data type. When we need to use the data in the array, we can assign the array to a variable so that we can use the data conveniently. This article will introduce how to assign PHP arrays to variables.

Overview of PHP arrays

In PHP, an array is a data structure used to store a set of data. It can store different types of data, such as numbers, strings, Boolean values, etc. . Array is a very commonly used data type. Arrays can be used to process data and implement various functions.

PHP array assignment syntax

In PHP, you can assign an array to a variable through the following syntax:

$variable = array(value1, value2, value3, …);

Among them, $variable is to assign a value The names of the variables, value1, value2, value3, etc. are the values ​​to be stored in the array. You can store as many values ​​as you like, separated by commas.

Arrays can also be assigned using the following syntax:

$array_name[key] = value;

Among them, $array_name is the name of the array to be assigned, key is the name of the array to be stored The key (also called the index), value is the value to be stored.

Array index can be a number or a string. If the index is a number, the array is treated as a numerically indexed array. If the index is a string, the array is treated as an associative array. Associative arrays have custom key/value pairs instead of being sorted in numerically indexed order.

PHP array assignment example

The following is some sample code to demonstrate how to assign a PHP array to a variable:

<?php // 数字索引数组
$my_array = array("apple", "banana", "orange");
print_r($my_array);
echo "<br>";

// 关联数组
$student = array("name" => "Tom", "age" => 20, "major" => "Computer Science");
print_r($student);
echo "<br>";

// 使用循环输出数字索引数组
foreach($my_array as $value) {
    echo "$value <br>";
}

// 使用循环输出关联数组
foreach($student as $key => $value) {
    echo "$key: $value <br>";
}
?>

The output result is:

Array ( [0] => apple [1] => banana [2] => orange )
Array ( [name] => Tom [age] => 20 [major] => Computer Science )
apple
banana
orange
name: Tom
age: 20
major: Computer Science

In the above example, a numeric index array $my_array and an associative array $student are first created, and then the print_r() function is used to output all elements of the array element.

Next, use a loop to output each element of the numeric index array and the associative array separately. For numerically indexed arrays, use foreach to loop and assign each element to the $value variable; for associative arrays, use foreach to loop and assign each key value Assign values ​​to the $key and $value variables respectively.

Summary

This article introduces how to assign PHP arrays to variables. Array is a very useful data structure that can be used to store and process various types of data. When using PHP arrays, assigning values ​​to variables is a very basic operation. Regarding its basic knowledge, we should master the better.

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