Summary of PHP array related functions, php array functions_PHP tutorial

Summary of PHP array related functions, php array functions

This article summarizes PHP array related functions. Share it with everyone for your reference. The details are as follows:

This includes function names and usage instructions, but there are no detailed code examples. Interested friends can check the relevant function usage on this site.

Array related processing functions

current(array name) outputs the value of a string in the array, starting from the first one.
key (array name) outputs a subscript in the array, starting from the first one.
next(array name) controls the array pointer to move backward.
prev(array name) controls the array pointer to move forward.
end(array name) controls the array pointer to move to the last digit.
reset(array name) controls the array pointer to move to the first position.
array_change_key_case(1. Target array 2. CASE_UPPER uppercase or CASE_LOWER lowercase) Change all array subscripts to uppercase or lowercase.
array_chunk(1. Target array 2. Decomposition number 3. Output Boolean true or false) Decompose an array into multiple small arrays.
array_count_values ​​(array name) is used to count the number of occurrences of each value in the array.
array_fill(1. Where does the subscript start from 2. How many are output 3. What are their values) is used to initialize the array.
array_filter (1. Target array 2. User-defined function) Filter function, customize what standard is true and what standard is false. This function can automatically filter out false strings.
array_flip (target array) changes the subscript to the value and the value to the subscript.
array_sum(target array) calculates the sum of all element values ​​in the target array.
array_unique (target array) removes duplicate values ​​in the target array.
array_values ​​(target array) removes all subscripts in the target array and recalculates the subscripts of the values ​​in this function from "0".
array_keys (target array) outputs all subscripts in the target array.
in_array(1. What you are looking for 2. Target array 3. Whether to search strictly according to the data type, if yes, enter true) Find whether there is any data to be searched for in the target array.
array_search(1. What you are looking for 2. Target array 3. Whether to search strictly) Find whether there is data to be searched for in the target array, and if so, output the subscript of this data.
array_key_exists(1. The subscript to be found 2. The target array) Finds whether there is the subscript to be searched for in the target array. If there is, it will output true, if not, it will output false.
extract(target array) converts the array into a variable.
compact(variable subscript to be converted into an array) Convert multiple variables into an array.

Arrays and stacks (first in, last out)

array_push(1. Target array 2. Value pushed onto the stack) Push function.
array_pop(target array) pop stack function.

Arrays and teams (first in, first out)

array_unshift(1. Target array 2. Value of push pair) Push pair function.
array_shift(1 target array) pops up the pair function.

Array sorting ignoring key names:

sort(target array) Sort from small to large.
rsort (target array) sorts from large to small.
Array sorting preserving key names:
asort (target array) retains the original subscript and sorts the values ​​from small to large.
arsort (target array) retains the original subscript and sorts the values ​​from large to small.

Sorting by natural sorting method:

natsort (target array) retains the original subscript, sorts the values ​​from large to small, and is not case sensitive.
natcasesort (target array) retains the original subscript, sorts the values ​​from small to large, and is not case sensitive.
array_merge(1. Target array 2. Target array...) Merge multiple arrays.
array_diff(1.Compared array 2.Compared array 3.Compared array...) Find the difference product of arrays.
array_intersect(1.Compared array 2.Compared array 3.Compared array...) Find the intersection product of arrays.

I hope this article will be helpful to everyone’s PHP programming design.