Table of Contents array_change_key_case -- Returns an array with all string keys lowercased or uppercasedarray_chunk -- Split an array into chunksarray_combine --  Creates an array by using one array for keys and another for its valuesarray_count_values -- Counts all the values of an arrayarray_diff_assoc -- Computes the difference of arrays with additional index checkarray_diff_uassoc -- Computes the difference of arrays with additional index check which is performed by a user supplied callback function.array_diff -- Computes the difference of arraysarray_fill -- Fill an array with valuesarray_filter --  Filters elements of an array using a callback functionarray_flip -- Exchanges all keys with their associated values in an arrayarray_intersect_assoc -- Computes the intersection of arrays with additional index checkarray_intersect -- Computes the intersection of arraysarray_key_exists -- Checks if the given key or index exists in the arrayarray_keys -- Return all the keys of an arrayarray_map --  Applies the callback to the elements of the given arraysarray_merge_recursive -- Merge two or more arrays recursivelyarray_merge -- Merge two or more arraysarray_multisort -- Sort multiple or multi-dimensional arraysarray_pad --  Pad array to the specified length with a valuearray_pop -- Pop the element off the end of arrayarray_push --  Push one or more elements onto the end of arrayarray_rand --  Pick one or more random entries out of an arrayarray_reduce --  Iteratively reduce the array to a single value using a callback functionarray_reverse --  Return an array with elements in reverse orderarray_search --  Searches the array for a given value and returns the corresponding key if successfularray_shift --  Shift an element off the beginning of arrayarray_slice -- Extract a slice of the arrayarray_splice --  Remove a portion of the array and replace it with something elsearray_sum --  Calculate the sum of values in an array.array_udiff_assoc -- Computes the difference of arrays with additional index check. The data is compared by using a callback function.array_udiff_uassoc -- Computes the difference of arrays with additional index check. The data is compared by using a callback function. The index check is done by a callback function alsoarray_udiff -- Computes the difference of arrays by using a callback function for data comparison.array_unique -- Removes duplicate values from an arrayarray_unshift --  Prepend one or more elements to the beginning of an arrayarray_values -- Return all the values of an arrayarray_walk --  Apply a user function to every member of an arrayarray --  Create an arrayarsort --  Sort an array in reverse order and maintain index associationasort -- Sort an array and maintain index associationcompact --  Create array containing variables and their valuescount -- Count elements in a variablecurrent -- Return the current element in an arrayeach --  Return the current key and value pair from an array and advance the array cursorend --  Set the internal pointer of an array to its last elementextract --  Import variables into the current symbol table from an arrayin_array -- Checks if a value exists in an arraykey -- Fetch a key from an associative arraykrsort -- Sort an array by key in reverse orderksort -- Sort an array by keylist --  Assign variables as if they were an arraynatcasesort --  Sort an array using a case insensitive "natural order" algorithmnatsort --  Sort an array using a "natural order" algorithmnext --  Advance the internal array pointer of an arraypos -- Alias of current() prev -- Rewind the internal array pointerrange --  Create an array containing a range of elementsreset --  Set the internal pointer of an array to its first elementrsort -- Sort an array in reverse ordershuffle -- Shuffle an arraysizeof -- Alias of count() sort -- Sort an arrayuasort --  Sort an array with a user-defined comparison function and maintain index associationuksort --  Sort an array by keys using a user-defined comparison functionusort --  Sort an array by values using a user-defined comparison function