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Array Functions

The following built-in functions can be used to process array data in PHP. To learn array syntax, see the Understanding Arrays document.

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 all the values of an array 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_diff — Computes the difference of arrays array_fill_keys — Fill an array with values, specifying keys array_fill — Fill an array with values array_filter — Filters elements of an array using a callback function array_flip — Exchanges all keys with their associated values in an array 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_intersect — Computes the intersection of arrays array_key_exists — Checks if the given key or index exists in the array array_keys — Return all the keys or a subset of the keys of an array array_map — Applies the callback to the elements of the given arrays array_merge_recursive — Merge two or more arrays recursively array_merge — Merge one or more arrays 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 entries out of an array array_reduce — Iteratively reduce the array to a single value using a callback function array_replace_recursive — Replaces elements from passed arrays into the first array recursively array_replace — Replaces elements from passed arrays into the first array array_reverse — Return an array with elements in reverse order array_search — Searches the array for a given value and returns the 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_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_udiff — Computes the difference of arrays by using a callback function for data comparison 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_uintersect — Computes the intersection of arrays, compares data by a callback function 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_recursive — Apply a user function recursively to every member of an array array_walk — Apply a user supplied function to every member of an array array — Create an array arsort — Sort an array in reverse order and maintain index association asort — Sort an array and maintain index association compact — Create array containing variables and their values count — Count all elements in an array, or something in an 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_exists — Alias of array_key_exists key — Fetch a key from an array krsort — Sort an array by key in reverse order ksort — Sort an array by key 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 array 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 reverse order shuffle — Shuffle an array sizeof — Alias of count sort — Sort an array 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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Functions

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