How to create a new array in php

In PHP, an array is a very common data type that can store one or more values ​​and is indexed by a specified key. In this article, we will learn how to create a new array and add elements to it.

In PHP, there are three ways to create a new array:

1. Use the array() function
   You can quickly create a new array through the array() function, The syntax is as follows:

$array_name = array(value1, value2, ..., valueN);

Among them, $array_name is the name of the array variable, value1, value2, ..., valueN is what needs to be added to the array value in . For example: The following code creates an array containing three elements:

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

2. Direct assignment
   You can also use direct assignment to create an array, for example:

$fruits[0] = "apple";
$fruits[1] = "orange";
$fruits[2] = "banana";

In this way, we can specify the key value of the array element. For example, in $fruits[0] = "apple", 0 is the key of the element.

3. Use short syntax
   Starting from PHP5.4 version, you can use short syntax to create a new array. The syntax is as follows:

$array_name = [value1, value2, ..., valueN];

This way It is equivalent to the array() function, for example:

$fruits = ["apple", "orange", "banana"];

After understanding the method of creating an array, we can add elements to the array through the following method:

1. Use the [] operator
   We can use the [] operator to add elements to the array, for example:

$fruits = array();
$fruits[] = "apple";
$fruits[] = "orange";
$fruits[] = "banana";

In this way, each time When you add an element, PHP automatically assigns the next integer key to the new element, for example the first element has a key of 0 and the second element has a key of 1.

2. Use the specified key method
   Similarly, we can also specify a specific key for the element, for example:

$fruits = array();
$fruits["a"] = "apple";
$fruits["o"] = "orange";
$fruits["b"] = "banana";

In this way, the element will Adds to the array according to the specified key.

Summary
In PHP, creating and adding elements to an array is very simple. We can use the array() function, direct assignment or short syntax to create a new array. At the same time, we can also use the [] operator or specify a key to add elements to the array. If you are working with complex data structures, arrays are an indispensable tool.

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