These functions allow you to interact with and manipulate arrays in various ways. Arrays are essential for storing, managing, and operating on sets of variables.
Installation:
There is no installation needed to use these functions; they are part of the PHP core.
Runtime Configuration:
This extension has no configuration directives defined in php.ini.
PHP Array Constants:
| Constant | Description |
|---|---|
| CASE_LOWER | Used with array_change_key_case() to convert array keys to lower case |
| CASE_UPPER | Used with array_change_key_case() to convert array keys to upper case |
| SORT_ASC | Used with array_multisort() to sort in ascending order |
| SORT_DESC | Used with array_multisort() to sort in descending order |
| SORT_REGULAR | Used to compare items normally |
| SORT_NUMERIC | Used to compare items numerically |
| SORT_STRING | Used to compare items as strings |
| SORT_LOCALE_STRING | Used to compare items as strings, based on the current locale |
| COUNT_NORMAL | |
| COUNT_RECURSIVE | |
| EXTR_OVERWRITE | |
| EXTR_SKIP | |
| EXTR_PREFIX_SAME | |
| EXTR_PREFIX_ALL | |
| EXTR_PREFIX_INVALID | |
| EXTR_PREFIX_IF_EXISTS | |
| EXTR_IF_EXISTS | |
| EXTR_REFS |
List of Functions:
PHP: indicates the earliest version of PHP that supports the function.
| Function | Description | PHP |
|---|---|---|
| array() | Create an array | 3 |
| array_change_key_case() | Returns an array with all keys in lowercase or uppercase | 4 |
| array_chunk() | Splits an array into chunks of arrays | 4 |
| array_combine() | Creates an array by using one array for keys and another for its values | 5 |
| array_count_values() | Returns an array with the number of occurrences for each value | 4 |
| array_diff() | Compares array values, and returns the differences | 4 |
| array_diff_assoc() | Compares array keys and values, and returns the differences | 4 |
| array_diff_key() | Compares array keys, and returns the differences | 5 |
| array_diff_uassoc() | Compares array keys and values, with an additional user-made function check, and returns the differences | 5 |
| array_diff_ukey() | Compares array keys, with an additional user-made function check, and returns the differences | 5 |
| array_fill() | Fills an array with values | 4 |
| array_fill_keys() | Fill an array with values, specifying keys | 5 |
| array_filter() | Filters elements of an array using a user-made function | 4 |
| array_flip() | Exchanges all keys with their associated values in an array | 4 |
| array_intersect() | Compares array values, and returns the matches | 4 |
| array_intersect_assoc() | Compares array keys and values, and returns the matches | 4 |
| array_intersect_key() | Compares array keys, and returns the matches | 5 |
| array_intersect_uassoc() | Compares array keys and values, with an additional user-made function check, and returns the matches | 5 |
| array_intersect_ukey() | Compares array keys, with an additional user-made function check, and returns the matches | 5 |
| array_key_exists() | Checks if the specified key exists in the array | 4 |
| array_keys() | Returns all the keys of an array | 4 |
| array_map() | Sends each value of an array to a user-made function, which returns new values | 4 |
| array_merge() | Merges one or more arrays into one array | 4 |
| array_merge_recursive() | Merges one or more arrays into one array | 4 |
| array_multisort() | Sorts multiple or multi-dimensional arrays | 4 |
| array_pad() | Inserts a specified number of items, with a specified value, to an array | 4 |
| array_pop() | Deletes the last element of an array | 4 |
| array_product() | Calculates the product of the values in an array | 5 |
| array_push() | Inserts one or more elements to the end of an array | 4 |
| array_rand() | Returns one or more random keys from an array | 4 |
| array_reduce() | Returns an array as a string, using a user-defined function | 4 |
| array_reverse() | Returns an array in the reverse order | 4 |
| array_search() | Searches an array for a given value and returns the key | 4 |
| array_shift() | Removes the first element from an array, and returns the value of the removed element | 4 |
| array_slice() | Returns selected parts of an array | 4 |
| array_splice() | Removes and replaces specified elements of an array | 4 |
| array_sum() | Returns the sum of the values in an array | 4 |
| array_udiff() | Compares array values in a user-made function and returns an array | 5 |
| array_udiff_assoc() | Compares array keys, and compares array values in a user-made function, and returns an array | 5 |
| array_udiff_uassoc() | Compares array keys and array values in user-made functions, and returns an array | 5 |
| array_uintersect() | Compares array values in a user-made function and returns an array | 5 |
| array_uintersect_assoc() | Compares array keys, and compares array values in a user-made function, and returns an array | 5 |
| array_uintersect_uassoc() | Compares array keys and array values in user-made functions, and returns an array | 5 |
| array_unique() | Removes duplicate values from an array | 4 |
| array_unshift() | Adds one or more elements to the beginning of an array | 4 |
| array_values() | Returns all the values of an array | 4 |
| array_walk() | Applies a user function to every member of an array | 3 |
| array_walk_recursive() | Applies a user function recursively to every member of an array | 5 |
| arsort() | Sorts an array in reverse order and maintain index association | 3 |
| asort() | Sorts an array and maintain index association | 3 |
| compact() | Create array containing variables and their values | 4 |
| count() | Counts elements in an array, or properties in an object | 3 |
| current() | Returns the current element in an array | 3 |
| each() | Returns the current key and value pair from an array | 3 |
| end() | Sets the internal pointer of an array to its last element | 3 |
| extract() | Imports variables into the current symbol table from an array | 3 |
| in_array() | Checks if a specified value exists in an array | 4 |
| key() | Fetches a key from an array | 3 |
| krsort() | Sorts an array by key in reverse order | 3 |
| ksort() | Sorts an array by key | 3 |
| list() | Assigns variables as if they were an array | 3 |
| natcasesort() | Sorts an array using a case insensitive "natural order" algorithm | 4 |
| natsort() | Sorts an array using a "natural order" algorithm | 4 |
| next() | Advance the internal array pointer of an array | 3 |
| pos() | Alias of current() | 3 |
| prev() | Rewinds the internal array pointer | 3 |
| range() | Creates an array containing a range of elements | 3 |
| reset() | Sets the internal pointer of an array to its first element | 3 |
| rsort() | Sorts an array in reverse order | 3 |
| shuffle() | Shuffles an array | 3 |
| sizeof() | Alias of count() | 3 |
| sort() | Sorts an array | 3 |
| uasort() | Sorts an array with a user-defined function and maintain index association | 3 |
| uksort() | Sorts an array by keys using a user-defined function | 3 |
| usort() | Sorts an array by values using a user-defined function | 3 |
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