Share some commonly used PHP array functions

PHP is a very popular server-side programming language. Its powerful array function provides programmers with a lot of convenience. There are many array functions in PHP, and each function has its own purpose and function. In this article, we will introduce commonly used PHP array functions, along with their usage and examples.

1. array() function

This function creates an array. Arrays can contain any type of data such as strings, numbers, Boolean and other arrays, etc. The following code shows how to use this function to implement an array:

$colors = array("Red", "Green", "Blue");

2. count() function

This function returns the number of elements in the array. For example:

$numbers = array(1, 2, 3, 4, 5);
echo count($numbers); // 输出 5

3. array_push() Function

This function adds one or more elements to the end of the array. For example:

$fruits = array("Apple", "Orange", "Banana");
array_push($fruits, "Pear", "Mango");
print_r($fruits);

The output result is:

Array
(
    [0] => Apple
    [1] => Orange
    [2] => Banana
    [3] => Pear
    [4] => Mango
)

4. array_pop() function

This function deletes the last element in the array and then returns its value. For example:

$fruits = array("Apple", "Orange", "Banana");
$last_fruit = array_pop($fruits);
echo $last_fruit; // 输出 Banana

5. array_shift() function

This function removes the first element in the array and returns its value. For example:

$fruits = array("Apple", "Orange", "Banana");
$first_fruit = array_shift($fruits);
echo $first_fruit; // 输出 Apple

6. array_unshift() function

This function adds one or more elements to the beginning of the array and moves the original elements backward one position. For example:

$fruits = array("Apple", "Orange", "Banana");
array_unshift($fruits, "Grape", "Pineapple");
print_r($fruits);

The output result is:

Array
(
    [0] => Grape
    [1] => Pineapple
    [2] => Apple
    [3] => Orange
    [4] => Banana
)

7. array_slice() function

This function removes the specified element from the array. For example:

$fruits = array("Apple", "Orange", "Banana", "Grape");
$selected_fruits = array_slice($fruits, 1, 2);
print_r($selected_fruits);

The output result is:

Array
(
    [0] => Orange
    [1] => Banana
)

8. array_merge() function

This function merges two or more arrays into one array. For example:

$fruits1 = array("Apple", "Orange", "Banana");
$fruits2 = array("Grape", "Pineapple");
$all_fruits = array_merge($fruits1, $fruits2);
print_r($all_fruits);

The output result is:

Array
(
    [0] => Apple
    [1] => Orange
    [2] => Banana
    [3] => Grape
    [4] => Pineapple
)

9. array_search() function

This function searches for the specified value in the array and returns the value key name. For example:

$numbers = array(1, 2, 3, 4, 5);
$key = array_search(3, $numbers);
echo $key; // 输出 2

10. array_keys() function

This function returns all the key names in the array. For example:

$fruits = array("Apple", "Orange", "Banana");
$keys = array_keys($fruits);
print_r($keys);

The output result is:

Array
(
    [0] => 0
    [1] => 1
    [2] => 2
)

The above are some examples of commonly used PHP array functions. There are many other array functions that are also very useful, such as array_diff(), array_intersect(), array_reverse() and so on. Knowing how to use these functions will help you use array functionality in PHP more efficiently.

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