Basic functions for working with arrays in PHP. Example of use

A list of functions for working with arrays that should know everyone.

Example arrays:

$goods = [
    [
        'title' => 'Nokia',
        'price' => '100',
        'qty' => '10',
    ],
    [
        'title' => 'Sony',
        'price' => '120',
        'qty' => '7',
    ],
    [
        'title' => 'LG',
        'price' => '105',
        'qty' => '15',
    ],
];

$car = [
    'brand' => 'Toyota',
    'model' => 'Camry',
    'year' => 2021,
    'speed' => 220,
    'wheels' => 4,
];

$nums = [1, 2, 3, 1, 4, 5, 3, 2, 6, 7, 7, 8, 8, 9, 2, 5,];

1. count – counts the number of elements in an array or anything in an object

count($goods, 1); //1 - enables recursive element counting.
//the function returns an int value equal to the number of elements in the array (starting with 0).

2. array_count_values – Counts the number of all values in an array

array_count_values($goods); 
//Returns an array whose keys are the values of array and whose values are the number of the values of array.

3. array_key_exists – checks if the specified key or index is present in the array.

array_key_exists('year', $goods));//check whether the key "years" is in the array "$goods";
//return true or false

4. in_array – checks if a value is present in an array;

in_array(2021, $goods)//checks whether the value "2021" is in the $goods array
//returns true or false

5. array_search – searches an array for a given value and returns the key of the first element found if successful

array_search(3, $goods));
//Returns the key "3" if it was found in the array, false otherwise.

6. array_keys – Returns all or some subset of the keys of an array

array_keys($goods);//Returns an array with all the keys of $car array.

7. array_values – selects all values in an array

array_values($goods);//Returns an indexed array of values.

8. array_unique – removes duplicate values from an array

array_unique($nums);//Removes duplicate values from an array. Returns the filtered array.

9. array_push – adds one or more elements to the end of the array.

array_push($array, 4, 5);

10. array_pop – removes and returns the last element of the array.

array_push($array, 4, 5);

11. array_shift – removes and returns the first element of the array.

$firstElement = array_shift($array); 

12. array_unshift – adds one or more elements to the beginning of the array.

array_unshift($array, 1);

13. array_merge – combines two or more arrays into one

$resultArray = array_merge($array1, $array2);

14. array_slice – returns the selected part of the array, starting at the specified position $start and length $length

$array = [1, 2, 3, 4, 5];
$slicedArray = array_slice($array, 2, 3);
// $slicedArray = [3, 4, 5]

15. array_reverse – returns an array with elements in reverse order.

$array = [1, 2, 3, 4, 5];
$reversedArray = array_reverse($array);
// $reversedArray = [5, 4, 3, 2, 1]