An array is a set of numbers that will follow a specific pattern. An orderly arrangement often in rows, columns or a matrix. In php, a group of homogeneous elements of a specific data type is known as an array. An array is similar to, but different from, one-dimensional arrays or two-dimensional arrays. Arrays hold a series of data elements, usually of the same size and data type. Individual elements are accessed by their position in the array.

In php array can be created in two ways,

one is $array['key']='value'; other is $array=array( => value); If key is not defined $array=array(value);

Array Functions

Table of Contents array_change_key_case -- Returns an array with all string keys lowercased or uppercased array_chunk -- Split an array into chunks 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 -- 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 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_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 a 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 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 elements in an array, or properties 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 -- Fetch a key from an associative 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