How to assign value to array in php

First, you need to understand what an array is. In PHP, an array is a special type of variable that can be used to store multiple values. Arrays can contain values ​​of any type, such as strings, integers, floats, objects, etc. In PHP, there are two types of arrays: indexed arrays and associative arrays.

An indexed array is an array identified by the position or index of the array element. Each element of an indexed array has an associated numeric index, which can be indexed using an integer or a string. To assign a value to an indexed array, you can use the following syntax:

$my_array = array(); //定义一个空的数组
$my_array[0] = "apple"; //给数组的第一个元素赋值
$my_array[1] = "banana"; //给数组的第二个元素赋值
$my_array[2] = "orange"; //给数组的第三个元素赋值

In the above example, an empty array $my_array is defined, and then the index $my_array[0] is defined , $my_array[1], $my_array[2] Assign a value to the array.

In addition to using array() to define an empty array, you can also use the following syntax to simultaneously define and initialize an indexed array:

$my_array = array("apple", "banana", "orange");

In this example, array# The elements in ##$my_array are the strings "apple", "banana", and "orange" respectively.

Associative arrays are arrays identified by the names or keywords of the array elements. Each element of an associative array has an associated string index, and any string can be used as a key. To assign a value to an associative array, you can use the following syntax:

$my_array = array(); //定义一个空的数组
$my_array["name"] = "Tom"; //给数组的"name"元素赋值
$my_array["age"] = 18; //给数组的"age"元素赋值
$my_array["address"] = "Beijing"; //给数组的"address"元素赋值

In the above example, an empty array

$my_array is defined, and then the key name "name"# is defined. ##, "age", "address" Assign values ​​to the array. In addition to using

array()

to define an empty array, you can also use the following syntax to simultaneously define and initialize an associative array: <pre class="brush:php;toolbar:false">$my_array = array(     &quot;name&quot; =&gt; &quot;Tom&quot;,     &quot;age&quot; =&gt; 18,     &quot;address&quot; =&gt; &quot;Beijing&quot; );</pre>In this example, array# The elements in ##$my_array

are the strings "Tom", "18", and "Beijing" respectively, and correspond to the key names

"name", "age"# respectively. ##, "address". To sum up, there are two ways to assign values ​​to arrays in PHP: assigning values ​​to array elements through the index or key name of the array. Whether it is an indexed array or an associative array, you can define and initialize an array using the array() function or directly in an assignment statement. It is very important for PHP developers to be proficient in array assignment methods.

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