PHP Array Introduction

Function Description PHP

 Testing Array and sizeof( )
<?php
$fixture = Array( );
// $fixture is expected to be empty.

$fixture[] = "element";
// $fixture is expected to contain one element.
?>


A really simple way to check whether we are getting the results we expect is to print the result of sizeof( ) before and after adding the element

array() Creates an array 
array_change_key_case() Returns an array with all keys in lowercase or uppercase
array_chunk() Splits an array into chunks of arrays 
array_combine() Creates an array by using one array for keys and another for its values 
array_count_values() Returns an array with the number of occurrences for each value
array_diff() Compares array values, and returns the differences
array_diff_assoc() Compares array keys and values, and returns the differences 
array_diff_key() Compares array keys, and returns the differences 
array_diff_uassoc() Compares array keys and values, with an additional user-made function check, and returns the differences 
array_diff_ukey() Compares array keys, with an additional user-made function check, and returns the differences 
array_fill() Fills an array with values 
array_filter() Filters elements of an array using a user-made function 
array_flip() Exchanges all keys with their associated values in an array 
array_intersect() Compares array values, and returns the matches 
array_intersect_assoc() Compares array keys and values, and returns the matches 
array_intersect_key() Compares array keys, and returns the matches 
array_intersect_uassoc() Compares array keys and values, with an additional user-made function check, and returns the matches 
array_intersect_ukey() Compares array keys, with an additional user-made function check, and returns the matches 
array_key_exists() Checks if the specified key exists in the array 
array_keys() Returns all the keys of an array 
array_map() Sends each value of an array to a user-made function, which returns new values 4
array_merge() Merges one or more arrays into one array 
array_merge_recursive() Merges one or more arrays into one array 
array_multisort() Sorts multiple or multi-dimensional arrays 
array_pad() Inserts a specified number of items, with a specified value, to an array 
array_pop() Deletes the last element of an array 
array_product() Calculates the product of the values in an array 
array_push() Inserts one or more elements to the end of an array 
array_rand() Returns one or more random keys from an array 
array_reduce() Returns an array as a string, using a user-defined function 
array_reverse() Returns an array in the reverse order 
array_search() Searches an array for a given value and returns the key 
array_shift() Removes the first element from an array, and returns the value of the removed element 
array_slice() Returns selected parts of an array 
array_splice() Removes and replaces specified elements of an array 
array_sum() Returns the sum of the values in an array 
array_udiff() Compares array values in a user-made function and returns an array 
array_udiff_assoc() Compares array keys, and compares array values in a user-made function, and returns an array 
array_udiff_uassoc() Compares array keys and array values in user-made functions, and returns an array 
array_uintersect() Compares array values in a user-made function and returns an array 
array_uintersect_assoc() Compares array keys, and compares array values in a user-made function, and returns an array 
array_uintersect_uassoc() Compares array keys and array values in user-made functions, and returns an array 
array_unique() Removes duplicate values from an array 
array_unshift() Adds one or more elements to the beginning of an array 
array_values() Returns all the values of an array 
array_walk() Applies a user function to every member of an array 
array_walk_recursive() Applies a user function recursively to every member of an array 
arsort() Sorts an array in reverse order and maintain index association 
asort() Sorts an array and maintain index association 
compact() Create array containing variables and their values
count() Counts elements in an array, or properties in an object 
current() Returns the current element in an array 
each() Returns the current key and value pair from an array 
end() Sets the internal pointer of an array to its last element 
extract() Imports variables into the current symbol table from an array 
in_array() Checks if a specified value exists in an array
key() Fetches a key from an 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 
next() Advance the internal array pointer of an array 
pos() Alias of current() 

prev() Rewinds the internal array pointer 

range() Creates an array containing a range of elements 
reset() Sets the internal pointer of an array to its first element
rsort() Sorts an array in reverse order
shuffle() Shuffles an array 
sizeof() Alias of count()
sort() Sorts an array 
uasort() Sorts an array with a user-defined function and maintain index association
uksort() Sorts an array by keys using a user-defined function
usort() Sorts an array by values using a user-defined function