Here is an alphabetical list of PHP’s built-in array functions.
| Function | Description |
|---|---|
| array() | Creates an array |
| array_change_key_case() | Change all keys in an array to lowercase or uppercase |
| array_chunk() | Splits an array into chunks of arrays |
| array_column() | Returns the values from a single column from the input array |
| array_combine() | Creates an array by using the elements from one "keys" array and one "values" array |
| array_count_values() | Counts all the values of an array |
| array_diff() | Compares the values of two (or more) arrays, and returns the differences |
| array_diff_assoc() | Compares the keys and values of two (or more) arrays, and returns the differences |
| array_diff_key() | Compares the keys of two (or more) arrays, and returns the differences |
| array_diff_uassoc() | Compare arrays, and returns the differences (keys and values, using a user-defined key comparison function) |
| array_diff_ukey() | Compare arrays, and returns the differences (compare keys only, using a user-defined key comparison function) |
| array_fill() | Fills an array with values |
| array_fill_keys() | Fills an array with a value and lets you specify what key to use |
| array_filter() | Filters the values of an array using a callback function |
| array_flip() | Flips or exchanges all keys with their associated values in an array |
| array_intersect() | Compare arrays, and returns the matches (compare values only) |
| array_intersect_assoc() | Compare arrays and returns the matches (compare keys and values) |
| array_intersect_key() | Compare arrays, and returns the matches (compare keys only) |
| array_intersect_uassoc() | Compare arrays, and returns the matches (compare keys and values, using a user-defined key comparison function) |
| array_intersect_ukey() | Compare arrays, and returns the matches (compare keys only, using a user-defined key comparison function) |
| array_key_exists() | Checks if the specified key exists in the array |
| array_keys() | Returns all the keys of an array |
| array_map() | Sends each value of an array to a user-made function, which returns new values |
| array_merge() | Merges one or more arrays into a single array |
| array_merge_recursive() | Merges one or more arrays into one array recursively |
| array_multisort() | Sorts multiple or multi-dimensional arrays |
| array_pad() | Inserts a specified number of items, with a specified value, to an array |
| array_pop() | Deletes the last element of an array |
| array_product() | Calculates the product of the values in an array |
| array_push() | Inserts one or more elements to the end of an array |
| array_rand() | Returns one or more random keys from an array |
| array_reduce() | Returns an array as a string, using a user-defined function |
| array_replace() | Replaces the values of the first array with the values from following arrays |
| array_replace_recursive() | Replaces the values of the first array with the values from following arrays recursively |
| array_reverse() | Returns an array in the reverse order |
| array_search() | Searches an array for a given value and returns the key |
| array_shift() | Removes the first element from an array, and returns the value of the removed element |
| array_slice() | Returns selected parts of an array |
| array_splice() | Removes and replaces specified elements of an array |
| array_sum() | Returns the sum of the values in an array |
| array_udiff() | Compare arrays, and returns the differences (compare values only, using a user-defined key comparison function) |
| array_udiff_assoc() | Compare arrays, and returns the differences (compare keys and values, using a built-in function to compare the keys and a user-defined function to compare the values) |
| array_udiff_uassoc() | Compare arrays, and returns the differences (compare keys and values, using two user-defined key comparison functions) |
| array_uintersect() | Compare arrays, and returns the matches (compare values only, using a user-defined key comparison function) |
| array_uintersect_assoc() | Compare arrays, and returns the matches (compare keys and values, using a built-in function to compare the keys and a user-defined function to compare the values) |
| array_uintersect_uassoc() | Compare arrays, and returns the matches (compare keys and values, using two user-defined key comparison functions) |
| array_unique() | Removes duplicate values from an array |
| array_unshift() | Adds one or more elements to the beginning of an array |
| array_values() | Returns all the values of an array |
| array_walk() | Apply a user-defined function to every element of an array |
| array_walk_recursive() | Apply a user-defined function recursively to every element of an array |
| arsort() | Sorts an associative array in descending order, according to the value |
| asort() | Sorts an associative array in ascending order, according to the value |
| compact() | Creates an array from variables and their values |
| count() | Returns the number of elements in an array |
| current() | Returns the value of the current element in an array |
| end() | Sets the internal pointer of an array to its last element, and returns its value |
| extract() | Imports variables into the current symbol table from an array |
| in_array() | Searches an array for a specific value |
| key() | Returns the element key from the current internal pointer position |
| krsort() | Sorts an associative array in descending order, according to the key |
| ksort() | Sorts an associative array in ascending order, according to key |
| list() | Assign variables as if they were an array |
| natcasesort() | Sorts an array using a case-insensitive "natural order" algorithm |
| natsort() | Sorts an array by using a "natural order" algorithm. The values keep their original keys |
| next() | Moves the internal pointer to, and outputs, the next element in the array |
| pos() | Returns the value of the current element in an array |
| prev() | Moves the internal pointer to, and outputs, the previous element in the array |
| range() | Creates an array containing a range of elements |
| reset() | Moves the internal pointer to the first element of the array |
| rsort() | Sorts an indexed array in descending order |
| shuffle() | Shuffles an array (i.e. randomizes the order of the array elements) |
| sizeof() | Count all elements in an array (alias of count() function) |
| sort() | Sorts an indexed array in ascending order |
| uasort() | Sorts an array by values using a user-defined comparison function |
| uksort() | Sorts an array by keys using a user-defined comparison function |
| usort() | Sorts an array using a user-defined comparison function |