Detailed explanation of PHP function manual: array_push()

array_push() is one of the most commonly used functions in PHP. It is a function used to push one or more values ​​to the end of an array. By adding values ​​to the end of the array, we can better manage and organize the array data.

In this article, we will take an in-depth look at the detailed usage and example scenarios of the array_push() function to help everyone better understand and apply this commonly used PHP function.

The syntax of the array_push() function is as follows:

array_push(array $array, $value1, $value2, $value3, ...)

Parameter explanation:

• $array: Required, the array to which values ​​need to be added.
• $value1, $value2, $value3: Optional, the values ​​that need to be added to the array.

Return value: Returns the number of array elements after adding new values.

The following is a very simple example of using array_push():

$fruits = array("apple", "banana", "orange");
array_push($fruits, "pear", "mango");
print_r($fruits);

Result output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => pear
    [4] => mango
)

In this example, we created an array containing three types of fruits , and then used the array_push() function to add two new fruits, "pear" and "mango", at the end. Finally, we use the print_r() function to print out the result, and we can see that the newly added fruit has been successfully added to the end of the array.

In addition to the above examples, array_push() has a wide range of usage scenarios. The following are some common usages.

1. Use the array_push() function to add elements to an empty array

First, we consider how to use the array_push() function to add elements to an empty array:

$items = array();
array_push($items, "item1", "item2", "item3");
print_r($items);

Running results:

Array
(
    [0] => item1
    [1] => item2
    [2] => item3
)

Here we first create an empty array, then use the array_push() function to add three elements in sequence, and use print_r() to print the result. As you can see, the newly added elements have been successfully inserted into the end of the array.

2. Use the array_push() function to add a single element to an existing array

In addition to adding multiple elements, the array_push() function can also be used to add a single element to an existing array. Elements:

$names = array("Tom", "Dick");
array_push($names, "Harry");
print_r($names);

Run result:

Array
(
    [0] => Tom
    [1] => Dick
    [2] => Harry
)

In this example, we first create an array containing two names, and then use the array_push() function to add a new one to the array The name is "Harry". Finally, we use the print_r() function to print out the result, and we can see that the newly added person's name has been successfully added to the end of the array.

3. Use the array_push() function to add another array to an existing array

The array_push() function can also be used to add another array to an existing array. At this time, we need to use the ... operator to split the array values ​​into independent parameters.

Here is a sample code:

$fruits = array("apple", "banana", "orange");
$moreFruits = array("pear", "mango");
array_push($fruits, ...$moreFruits);
print_r($fruits);

Running result:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => pear
    [4] => mango
)

Here, we first create two different fruit arrays, and then use the... operator Split the values ​​in the $moreFruits array into separate parameters and pass them to the array_push() function. In this way, we have successfully added the values ​​from the $moreFruits array to the $fruits array.

4. Use the array_push() function to add multiple elements to an existing array

Finally, let’s take a look at how to use the array_push() function to add multiple elements to an existing array:

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

Run results:

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

In this example, we use the array_push() function to add three new elements "pear", " grape” and “mango.”

Through these example scenarios, I believe everyone has a deeper understanding and application skills of the array_push() function. Although the array_push() function is a very simple function in PHP, it can provide great convenience in actual development, allowing us to process and organize array data more easily.

In actual development, we can use the array_push() function to implement different functions according to specific needs, providing a more efficient and optimized implementation solution for development work and business logic.

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