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Handling Strings and Arrays in PHP

Jul 29, 2005

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Listing of the Array Functions

Just as it has many string functions, PHP also has many array functions. You can see a sample of them in Table 3-2.

Table 3-2. The Array Functions

Function Name	Purpose
`array_chunk`	Splits an array into chunks
`array_combine`	Creates an array by using one array for the keys and another for the values
`array_count_values`	Counts the values in an array
`array_diff`	Computes the difference of arrays
`array_fill`	Fills an array with values
`array_intersect`	Computes the intersection of arrays
`array_key_exists`	Checks whether the given key or index exists in the array
`array_keys`	Returns the keys in an array
`array_merge`	Merges two or more arrays
`array_multisort`	Sorts multiple or multidimensional arrays
`array_pad`	Pads array to the specified length with a value
`array_pop`	Pops the element off the end of an array
`array_push`	Pushes one or more elements onto the end of array
`array_rand`	Picks one or more random elements out of an array
`array_reduce`	Reduces the array to a single value with a callback function
`array_reverse`	Returns an array with elements in reverse order
`array_search`	Searches the array for a given value and returns the corresponding key
`array_shift`	Shifts an element off the beginning of array
`array_slice`	Extracts a slice of the array
`array_sum`	Calculates the sum of values in an array
`array_unique`	Removes duplicate elements from an array
`array_unshift`	Adds one or more elements to the beginning of an array
`array_walk`	Calls a user-supplied function on every member of an array
`array`	Creates an array
`asort`	Sorts an array and maintains index association
`count`	Counts the elements in an array
`current`	Returns the current element in an array
`each`	Returns the current key and value pair from an array and advances the array cursor
`in_array`	Checks whether a value exists in an array
`key`	Gets a key from an associative array
`krsort`	Sorts an array by key in reverse order
`ksort`	Sorts an array by key
`list`	Assigns variables as if they were an array
`natcasesort`	Sorts an array using a case-insensitive "natural order" algorithm
`natsort`	Sorts an array using a "natural order" algorithm
`pos`	Alias of the current function
`reset`	Sets the pointer of an array to its first element
`rsort`	Sorts an array in reverse order
`shuffle`	Shuffles an array's elements
`sizeof`	Alias of the `count` function
`sort`	Sorts an array
`usort`	Sorts an array by values with a user-defined comparison function

We'll see a number of the most important array functions in this chapter, such as those that let you sort the contents of an array, which are coming up next.

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