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Sort an array by key
(PHP 4, PHP 5)
Example 311. ksort() example<?phpThe above example will output: a = orangeRelated Examples ( Source code ) » ksort Examples ( Source code ) » sort an associative array on the basis of keys Examples ( Source code ) » Using uksort() to Sort an Associative Array by the Length of Its Keys Examples ( Source code ) » E-mail address validation class Code Examples / Notes » ksort06-nov-2006 01:26
Why not just use built-in PHP functions? You can do an in-place natural sort by keys with: uksort($array, 'strnatcasecmp'); ssb45
The function that justin at booleangate dot org provides works well, but be aware that it is not a drop-in replacement for ksort as is. While ksort sorts the array by reference and returns a status boolean, natksort returns the sorted array, leaving the original untouched. Thus, you must use this syntax: $array = natksort($array); If you want to use the more natural syntax: $status = natksort($array); Then use this modified version: function natksort(&$array) { $keys = array_keys($array); natcasesort($keys); foreach ($keys as $k) { $new_array[$k] = $array[$k]; } $array = $new_array; return true; } sbarnum
ksort on an array with negative integers as keys yields some odd results. Not sure if this is a bad idea (negative key values) or what.
richard dot quadling
Just to complete the comments made by ssb45. If the supplied array is an empty array, the value returned is NOT an array. All that is required is to pre-initialize the result. function natksort(&$aToBeSorted) { $aResult = array(); $aKeys = array_keys($aToBeSorted); natcasesort($aKeys); foreach ($aKeys as $sKey) { $aResult[$sKey] = $aToBeSorted[$sKey]; } $aToBeSorted = $aResult; return True; } erikjr
Just a short note on "don dot hosek at gmail dot com" remark, the ksort returns TRUE or FALSE and performs its actual operation directly on the array in the function call. Thus; it would be <?php ksort ( $a ); ?> instead of <?php $a = ksort ( $a ); ?> as noted in his piece. I didn't understand why my sorting kept returning '1' at first, but that was it. don dot hosek
It's worth noting that ksort is also handy if you want to be able to do manipulations on an numerically-keyed array which may not have been initialized in numerical order: $a[2]=7; $a[0]=1; $a[1]=6; foreach($a as $b) { echo "$b "; } $a = ksort($a); foreach($a as $b) { echo "$b "; } yaroukh
I believe documentation should mention which of array-functions do reset the internal pointer; this one does so ...
justin
Here's a handy function for natural order sorting on keys. function natksort($array) { // Like ksort but uses natural sort instead $keys = array_keys($array); natsort($keys); foreach ($keys as $k) $new_array[$k] = $array[$k]; return $new_array; } 09-mar-2002 03:09
here 2 functions to ksort/uksort an array and all its member arrays function tksort(&$array) { ksort($array); foreach(array_keys($array) as $k) { if(gettype($array[$k])=="array") { tksort($array[$k]); } } } function utksort(&$array, $function) { uksort($array, $function); foreach(array_keys($array) as $k) { if(gettype($array[$k])=="array") { utksort($array[$k], $function); } } } maxx
Beware! The function removes the keys with an empty value from the array. :-(
delvach
A real quick way to do a case-insensitive sort of an array keyed by strings: uksort($myArray, "strnatcasecmp"); pedromartinez
A list of directories can be listed sorted by date (newer first) with this script. This is usefull if the directories contain (for example) pictures and you want the newer to appear first. $maindir = "." ; $mydir = opendir($maindir) ; // SORT $directorios = array(); while (false !== ($fn = readdir($mydir))) { if (is_dir($fn) && $fn != "." && $fn != "..") { $directory = getcwd()."/$fn"; $key = date("Y\-m\-d\-His ", filectime($directory)); $directorios[$key] = $directory; } } ksort($directorios); $cronosdir = array(); $cronosdir = array_reverse($directorios); while (list($key, $directory) = each($cronosdir)) { echo "$key = $directory<bR>"; } Pedro |
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