Common array functions used in PHP development

In PHP development, arrays are a very commonly used data type, and array functions are also one of the commonly used tools in PHP development. This article will introduce some commonly used PHP array functions, which can help developers process and operate arrays more efficiently.

1. array_push()

array_push() function appends one or more elements to the back of the array. Sample code:

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

Output:

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

2. array_pop()

array_pop() function pops the element at the end of the array and returns the value of the element . Sample code:

$array = array("apple", "banana", "orange");
$last_item = array_pop($array);
print($last_item); // 输出：orange
print_r($array); // 输出：Array([0] => apple [1] => banana)

3. array_shift()

array_shift() function pops the element at the beginning of the array and returns the value of that element. Sample code:

$array = array("apple", "banana", "orange");
$first_item = array_shift($array);
print($first_item); // 输出：apple
print_r($array); // 输出：Array([0] => banana [1] => orange)

4. array_unshift()

array_unshift() function inserts one or more elements to the beginning of the array. Sample code:

$array = array("apple", "banana");
array_unshift($array, "orange", "grape");
print_r($array);

Output:

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

5. array_slice()

array_slice() function returns the selected portion from the array without modifying the original array. Sample code:

$array = array("apple", "banana", "orange", "grape");
$sliced_array = array_slice($array, 1, 2);
print_r($sliced_array); // 输出：Array([0] => banana [1] => orange)
print_r($array); // 输出：Array([0] => apple [1] => banana [2] => orange [3] => grape)

6. array_merge()

array_merge() function merges two or more arrays into a single array. Example code:

$array1 = array("apple", "banana");
$array2 = array("orange", "grape");
$merged_array = array_merge($array1, $array2);
print_r($merged_array);

Output:

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

7. array_reverse()

array_reverse() function returns a new array that is arranged in reverse order The elements of the original array. Sample code:

$array = array("apple", "banana", "orange", "grape");
$reversed_array = array_reverse($array);
print_r($reversed_array);

Output:

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

8. in_array()

in_array() function checks whether a value is in an array. It returns true if found or false if not found. Sample code:

$array = array("apple", "banana", "orange", "grape");
$is_orange_in_array = in_array("orange", $array);
print($is_orange_in_array); // 输出：1（true）

9. array_search()

array_search() function searches the array for a specified value and returns the key name of the value. Sample code:

$array = array("apple", "banana", "orange", "grape");
$orange_key = array_search("orange", $array);
print($orange_key); // 输出：2

10. array_keys()

array_keys() function returns all key names in the array. Sample code:

$array = array("name" => "John", "age" => 30, "country" => "USA");
$keys = array_keys($array);
print_r($keys); // 输出：Array([0] => name [1] => age [2] => country)

Summary

This article introduces some commonly used PHP array functions, which can help developers process and operate arrays more efficiently. Developers should choose the function that suits them according to their own needs to achieve better array processing and operations.

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