Introduction to the use of array_push() function in PHP function library

PHP is a highly flexible and powerful server-side scripting language that is widely used in the field of Web development. PHP has many functions in its huge function library, among which array_push() is one of the very important functions. It is a built-in function used to add one or more values ​​to the end of an array. Let's introduce the detailed usage of array_push() function.

1. The basic syntax of the array_push() function

The basic syntax of array_push() is as follows:

array_push ( array &$array , mixed $value1 [, mixed $... ] ) : int

In the above syntax, we can see that the function has two parameters: $array and $value1. Among them, $array is a required parameter, indicating the array to which elements are to be added; $value1 and subsequent parameters are optional, indicating the value to be added to the end of the array. These values ​​can be of any type, such as strings, numbers, objects, etc.

The array_push() function will return the number of elements in the new array, which is the total number of elements in the array after executing the function. Note: The $array parameter must be passed by reference. This means that the array argument passed to the function is not copied, but the array is manipulated directly.

2. Examples of using the array_push() function

Let’s look at some specific examples to demonstrate the use of the array_push() function.

Example 1: Adding a value to the end of an array

In this example, we will add a new name to an array called $names.

$names = array('Alice', 'Bob', 'Charlie');
array_push($names, 'David');

print_r($names);  // 输出：Array ( [0] => Alice [1] => Bob [2] => Charlie [3] => David )

In the above example, first we create an array named $names, which contains three names. Then, we use the array_push() function to add the string 'David' to the array. Finally, we use the print_r() function to output the array $names and find that the new element has been added to the last position.

Example 2: Add multiple values ​​to the end of the array

Now, let’s look at an example of adding multiple values ​​to the array. In this example, we will add two new colors to a $colors array.

$colors = array('red', 'green', 'blue');
array_push($colors, 'yellow', 'purple');

print_r($colors);  // 输出：Array ( [0] => red [1] => green [2] => blue [3] => yellow [4] => purple )

In the above example, we used the array_push() function to add two new elements 'yellow' and 'purple' to the array named $colors.

Conclusion

The array_push() function is a very useful array operation function in PHP, which can easily add new elements to the array. In actual development, we often need to use this function. I hope the introduction in this article will be helpful to everyone's development work.

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