<?php
/**
* Take an array and make and change the case according to $mode
* bool array_key_case_change( array &array [, int mode ] )
*
* array is the input array.
*
* mode can be one of three choices: CASE_UPPER, CASE_LOWER, CASE_FIRST,
* defaults to CASE_FIRST if left out.
*
* Returns TRUE on success, FALSE on failure.
*
* Numeric keys will not change since there is no capital 2 (unless you work in tech support).
*
* The following IF statements will make sure that the required constants are set
**/
if (!defined('CASE_UPPER')) define('CASE_UPPER', 1);
if (!defined('CASE_LOWER')) define('CASE_LOWER', 2);
if (!defined('CASE_FIRST')) define('CASE_FIRST', 3);
function array_key_case_change(&$array, $mode = CASE_FIRST) {
// Make sure $array is really an array
if (!is_array($array)) return false;
$temp = $array;
while (list($key, $value) = each($temp)) {
// First we unset the original so it's not lingering about
unset($array[$key]);
// Then modify the $key
switch($mode) {
case CASE_UPPER:
$key = strtoupper($key);
break;
case CASE_LOWER:
$key = strtolower($key);
break;
case CASE_FIRST:
$key = ucfirst(strtolower($key));
break;
}
// Lastly readd to the array using the new $key
$array[$key] = $value;
}
return true;
}
?>
array_change_key_case
说明
array array_change_key_case ( array input [, int case] )array_change_key_case() 将 input 数组中的所有键名改为全小写或大写。改变是根据后一个选项 case 参数来进行的。可以在这里用两个常量，CASE_UPPER 和 CASE_LOWER。默认值是 CASE_LOWER。本函数不改变数字索引。
如果一个数组中的多个键名经过本函数后变成一样的话（例如 "keY" 和 "kEY"），最后一个值将覆盖其它的值。
add a note
User Contributed Notes
egingell at sisna dot com
14-Apr-2006 09:01
14-Apr-2006 09:01
cmorell184 at comcast dot net
16-Jan-2006 02:59
16-Jan-2006 02:59
The following function will do a switch case case on your array keys (foobar would become FoObAr)
Not sure if it will come in handy, but it may
<?php
function array_case_switch($array) {
$curr = 1;
foreach ($array as $key=>$value) {
$newkey = "";
for ($i = 0; $i < strlen($key); $i++) {
if ($curr % 2) {
$newkey .= ($i % 2) ? strtolower(substr($key,$i,1)) : strtoupper(substr($key,$i,1));
} else {
$newkey .= ($i % 2) ? strtoupper(substr($key,$i,1)) : strtolower(substr($key,$i,1));
}
}
$newarray[$newkey] = $value;
$curr++;
}
return $newarray;
}
?>
cdblog at gmail dot com
20-May-2005 04:55
20-May-2005 04:55
<?php
/**
* @return array
* @author Cocol
* @desc change the key case , if found repeat keys, then convert to array
* for more detail please visit http://php.clickz.cn/array/array_change_key_case.html
*/
function array_change_key_case_secure($array = array(),$case = CASE_UPPER) {
$secure = array();
if ($case == CASE_UPPER) {
foreach ($array as $key=>$val) {
$key = strtoupper($key);
if (!array_key_exists($key,$secure)) {
$secure[$key][] = $val;
} else {
$secure[$key][] = $val;
}
}
} else if ($case == CASE_LOWER) {
foreach ($array as $key=>$val) {
$key = strtolower($key);
if (!array_key_exists($key,$secure)) {
$secure[$key][] = $val;
} else {
$secure[$key][] = $val;
}
}
}
foreach ($secure as $key=>$val) {
if (count($secure[$key]) == 1) {
$secure[$key] = $val[0];
}
}
return $secure;
}
$array = array(
'a' => "john",
'A' => "vary",
'c' => "cocol",
);
print_r($array);
$array = array_change_key_case_secure($array,CASE_UPPER);
print_r($array);
?>
output:
Array
(
[a] => john
[A] => vary
[c] => cocol
)
Array
(
[A] => Array
(
[0] => john
[1] => vary
)
[C] => cocol
)
benles at bldigital dot com
06-Mar-2005 09:20
06-Mar-2005 09:20
In case you want to find the original case of a key:
$arr = Array( "a"=>1, "B"=>2);
function array_get_key_case($arr, $k)
{
$s = strtolower($k);
foreach (array_keys($arr) as $key) if (strtolower($key) == $s) return $key;
return $k;
}
// Should print aBC
echo array_get_key_case($arr, "A");
echo array_get_key_case($arr, "B");
echo array_get_key_case($arr, "C");
aidan at php dot net
02-Jun-2004 11:06
02-Jun-2004 11:06
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat
euphoria{AT}netdoor.org
18-Nov-2002 01:31
18-Nov-2002 01:31
Just a note, this function kills any name-clashes! Say you had:
$array = array('key1' => 'abc', 'key2' => 'def', 'KEY1' => 'ghi');
$array = array_change_key_case($array);
then you would end up with:
Array
(
[key1] => ghi
[key2] => def
)
(Change .org to .com to e-mail me)
Armond