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Tuesday, October 17, 2006

PHP array_change_key_case() Function

array_change_key_case -- Returns an array with
all string keys lowercased or uppercased, it is by default lowercased CASE_LOWER,
but we can use use the predefined constant CASE_UPPER for uppercase.


Syntax:


array array_change_key_case ( array input [, int case]
)


It will return an array result, you must provide an array parameter, and you
can provide optionaly the case you want to change the keys to.


A simple example presenting this function:


Example 1:


<?php

$input_array = array("FirSt" => 1, "SecOnd" => 4);

print_r(array_change_key_case($input_array, CASE_UPPER));

?>


This will output :


Array

(

[FIRST] => 1

[SECOND] => 4

)


Example 2:


<?php

$a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");

print_r(array_change_key_case($a,CASE_UPPER));

?>


This will output :


Array ( [A] => Cat [B] => Dog [C] => Horse )


Example 3:


<?php

$a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse","B"=>"Bird");

print_r(array_change_key_case($a,CASE_UPPER));

?>


This will output :


Array ( [A] => Cat [B] => Bird [C] => Horse
)


As you see this function will walk through every key element and change it
to uppercase.

Quick quide to PHP array functions

These functions allow you to interact with and manipulate arrays in various
ways. Arrays are essential for storing, managing, and operating on sets of variables.


Simple and multi-dimensional arrays are supported, and may be either user
created or created by another function. There are specific database handling
functions for populating arrays from database queries, and several functions
return arrays.


An array in PHP is actually an ordered map. A map is a type that maps values
to keys. This type is optimized in several ways, so you can use it as a real
array, or a list (vector), hashtable (which is an implementation of a map),
dictionary, collection, stack, queue and probably more. Because you can have
another PHP array as a value, you can also quite easily simulate trees.


Now let us see the list of functions we have:


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

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