Common PHP array functions

1. array_unshift inserted at the beginning of an array of one or more values
   Example: array_unshift ([2,3.4], 1 ) Results: [1, 2, 3, 4]
2. the insertion end of the array array_push
   Example: array_push ([1, 2, 3], 4]) Results: [1, 2, 3, 4]
3. array_diff - difference set computing arrays 
4. Remove the last element in the array array_pop
   Example: array_pop ([1,2,3,4]) Results: [1, 2, 3]
5. The combined arrays array_merge two
   examples: array_merge ([1, 3], [2, 4]) Results: [1, 2, 3, 4]
6. has a value search array array_search
   Example: array_search ([1, 3] , 3) Results: key 1 returns an array of values
7. in_array check whether there is a value in the array
   Example: in_array (1, [1, 2, 3]) Results: true
8. array_unique remove duplicate values in the array of
   sample: array_unique ([1,3,3,4]) Results: [1, 3, 4]
9. implode array connector
   Example: implode ( ':', [ 1, 2, 3, 4]) Results: 1: 2: 3: 4
10. sort (): Key value ascending order
    rsort (): Key value decommitment
    ksort (): Sort associative array keys in ascending order, sorting the results of retained association key
11. count () statistics