Practical PHP function library: array_push()

PHP is a widely used open source server-side scripting language with extensive scalability and flexibility. Among them, the function library is one of the most frequently used parts in PHP development. It provides many practical functions to operate on data.

In PHP, you can use function libraries to quickly implement common data operations, such as adding, deleting, and modifying arrays. This article will introduce a commonly used function: array_push(), which is used to add one or more elements to the end of an array.

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

array_push(array $array, mixed $value1[, mixed $value2, ...])

Among them, $array represents the array variable to which elements are to be added, $value1, $value2, etc. represent the elements to be added, which can be of any type.

The way to use this function is very simple. The code example is as follows:

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

Run the above code and the output result is as follows:

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

As you can see, through the array_push() function, We successfully added two elements "pear" and "orange" to the $fruits array. It should be noted that this function directly modifies the original array rather than returning a new copy of the array.

In addition to adding elements, the array_push() function also has a return value, indicating the length of the array after adding elements. For example:

$fruits = array("apple", "banana");
$length = array_push($fruits, "pear", "orange");
echo "The new length of the array is " . $length;

The output result is as follows:

The new length of the array is 4

You can see that the value of $length is 4, which is the length of the array after adding elements.

It should be noted that when using the array_push() function to add elements to an array, multiple elements can be added at the same time, and multiple elements are separated by commas. For example:

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

The output result is as follows:

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

In addition, it is worth noting that the array_push() function can also add all the elements of another array to the target array by passing the array parameter. For example:

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

The output result is as follows:

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

As you can see, by adding the "..." operator before the array parameter, we successfully added all elements in the $addFruits array Arriving at the $fruits array.

In general, the array_push() function is a very practical PHP function that can quickly add elements to an array. By learning this function, developers can perform data operations more conveniently and improve development efficiency.

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