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.
