How to add to array in php

Add Elements

PHP is a very popular server-side scripting language, often used in website development, and is one of the core technologies of many websites. In PHP, an array is a very commonly used data structure used to store a set of ordered data. During development, we often need to add elements to arrays. This article will introduce how to add elements to an array in PHP.

1. Use the array_push() function

The array_push() function is a common method in PHP to add elements to an array. This function pushes one or more elements to the end of the array and returns the length of the new array.

The usage is as follows:

$fruits = array("apple", "banana", "orange");
array_push($fruits, "watermelon", "grape");
print_r($fruits);

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => watermelon
    [4] => grape
)

In the above example, we first define a fruit array $fruits, and then push it to the array through the array_push() function Two elements are added to , and finally the array after adding elements is printed out using the print_r() function.

2. Use the " " operator

In addition to using the array_push() function, we can also use the " " operator to add elements to the array. This operator joins two arrays into a new array and implements the function of adding elements to the array.

The usage is as follows:

$fruits1 = array("apple", "banana", "orange");
$fruits2 = array("watermelon", "grape");
$fruits = $fruits1 + $fruits2;
print_r($fruits);

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => watermelon
    [4] => grape
)

In the above example, we first define two fruit arrays $fruits1 and $fruits2, and then pass " " The operator concatenates them into a new array, and finally uses the print_r() function to print out the array after adding elements.

It should be noted that when adding elements using the " " operator, if the same key name exists in the two arrays, the later array elements will replace the previous array elements.

3. Use the "$array[]" syntax

PHP also provides a simple way to add elements to an array, which is to use the "$array[]" syntax. This syntax can directly add an element to the array and assign a new key name.

The usage is as follows:

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

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => watermelon
)

In the above example, we first define a fruit array $fruits, and then use "$fruits[]" The syntax adds an element to the array, and finally uses the print_r() function to print out the array after adding the element.

It should be noted that when adding an element using the "$array[]" syntax, PHP will automatically assign a new key name to the element, and the value of the key name is the current largest integer key name plus 1.

Summary

This article introduces three ways to add elements to an array in PHP: using the array_push() function, using the " " operator and using the "$array[]" syntax. Different methods are suitable for different scenarios. In actual development, it is necessary to choose the appropriate method according to the specific situation. Through the introduction of this article, I believe that readers have mastered the skills of adding elements to PHP arrays.

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