# Arrays

# Introduction

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.

Simple and multi-dimensional arrays are supported, and may be either user created or created by another function. There are specific database handling functions for populating arrays from database queries, and several functions return arrays.

Please see the Arrays section of the manual for a detailed explanation of how arrays are implemented and used in PHP. See also Array operators for other ways how to manipulate the arrays.

- Predefined Constants
- Sorting Arrays
- Array Functions
  - array — Create an array
  - array_all — Checks if all array elements satisfy a callback function
  - array_any — Checks if at least one array element satisfies a callback function
  - array_change_key_case — Changes the case of all keys in an array
  - array_chunk — Split an array into chunks
  - array_column — Return the values from a single column in the input array
  - array_combine — Creates an array by using one array for keys and another for its values
  - array_count_values — Counts the occurrences of each distinct value in an array
  - array_diff — Computes the difference of arrays
  - array_diff_assoc — Computes the difference of arrays with additional index check
  - array_diff_key — Computes the difference of arrays using keys for comparison
  - array_diff_uassoc — Computes the difference of arrays with additional index check which is performed by a user supplied callback function
  - array_diff_ukey — Computes the difference of arrays using a callback function on the keys for comparison
  - array_fill — Fill an array with values
  - array_fill_keys — Fill an array with values, specifying keys
  - array_filter — Filters elements of an array using a callback function
  - array_find — Returns the first element satisfying a callback function
  - array_find_key — Returns the key of the first element satisfying a callback function
  - array_first — Gets the first value of an array
  - array_flip — Exchanges all keys with their associated values in an array
  - array_intersect — Computes the intersection of arrays
  - array_intersect_assoc — Computes the intersection of arrays with additional index check
  - array_intersect_key — Computes the intersection of arrays using keys for comparison
  - array_intersect_uassoc — Computes the intersection of arrays with additional index check, compares indexes by a callback function
  - array_intersect_ukey — Computes the intersection of arrays using a callback function on the keys for comparison
  - array_is_list — Checks whether a given array is a list
  - array_key_exists — Checks if the given key or index exists in the array
  - array_key_first — Gets the first key of an array
  - array_key_last — Gets the last key of an array
  - array_keys — Return all the keys or a subset of the keys of an array
  - array_last — Gets the last value of an array
  - array_map — Applies the callback to the elements of the given arrays
  - array_merge — Merge one or more arrays
  - array_merge_recursive — Merge one or more arrays recursively
  - array_multisort — Sort multiple or multi-dimensional arrays
  - array_pad — Pad array to the specified length with a value
  - array_pop — Pop the element off the end of array
  - array_product — Calculate the product of values in an array
  - array_push — Push one or more elements onto the end of array
  - array_rand — Pick one or more random keys out of an array
  - array_reduce — Iteratively reduce the array to a single value using a callback function
  - array_replace — Replaces elements from passed arrays into the first array
  - array_replace_recursive — Replaces elements from passed arrays into the first array recursively
  - array_reverse — Return an array with elements in reverse order
  - array_search — Searches the array for a given value and returns the first corresponding key if successful
  - array_shift — Shift an element off the beginning of array
  - array_slice — Extract a slice of the array
  - array_splice — Remove a portion of the array and replace it with something else
  - array_sum — Calculate the sum of values in an array
  - array_udiff — Computes the difference of arrays by using a callback function for data comparison
  - array_udiff_assoc — Computes the difference of arrays with additional index check, compares data by a callback function
  - array_udiff_uassoc — Computes the difference of arrays with additional index check, compares data and indexes by a callback function
  - array_uintersect — Computes the intersection of arrays, compares data by a callback function
  - array_uintersect_assoc — Computes the intersection of arrays with additional index check, compares data by a callback function
  - array_uintersect_uassoc — Computes the intersection of arrays with additional index check, compares data and indexes by separate callback functions
  - array_unique — Removes duplicate values from an array
  - array_unshift — Prepend one or more elements to the beginning of an array
  - array_values — Return all the values of an array
  - array_walk — Apply a user supplied function to every member of an array
  - array_walk_recursive — Apply a user function recursively to every member of an array
  - arsort — Sort an array in descending order and maintain index association
  - asort — Sort an array in ascending order and maintain index association
  - compact — Create array containing variables and their values
  - count — Counts all elements in an array or in a Countable object
  - current — Return the current element in an array
  - each — Return the current key and value pair from an array and advance the array cursor
  - end — Set the internal pointer of an array to its last element
  - extract — Import variables into the current symbol table from an array
  - in_array — Checks if a value exists in an array
  - key — Fetch a key from an array
  - key_exists — Alias of array_key_exists
  - krsort — Sort an array by key in descending order
  - ksort — Sort an array by key in ascending order
  - list — Assign variables as if they were an array
  - natcasesort — Sort an array using a case insensitive "natural order" algorithm
  - natsort — Sort an array using a "natural order" algorithm
  - next — Advance the internal pointer of an array
  - pos — Alias of current
  - prev — Rewind the internal array pointer
  - range — Create an array containing a range of elements
  - reset — Set the internal pointer of an array to its first element
  - rsort — Sort an array in descending order
  - shuffle — Shuffle an array
  - sizeof — Alias of count
  - sort — Sort an array in ascending order
  - uasort — Sort an array with a user-defined comparison function and maintain index association
  - uksort — Sort an array by keys using a user-defined comparison function
  - usort — Sort an array by values using a user-defined comparison function

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