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PHP : Function Reference : String Functions : strnatcasecmp

strnatcasecmp

Case insensitive string comparisons using a "natural order" algorithm (PHP 4, PHP 5)
int strnatcasecmp ( string str1, string str2 )

This function implements a comparison algorithm that orders alphanumeric strings in the way a human being would. The behaviour of this function is similar to strnatcmp(), except that the comparison is not case sensitive. For more information see: Martin Pool's Natural Order String Comparison page.

Parameters

str1

The first string.

str2

The second string.

Return Values

Similar to other string comparison functions, this one returns < 0 if str1 is less than str2 > 0 if str1 is greater than str2, and 0 if they are equal.

Code Examples / Notes » strnatcasecmp

thomas

There seems to be a bug in the localization for strnatcmp and strnatcasecmp. I searched the reported bugs and found a few entries which were up to four years old (but the problem still exists when using swedish characters).
These functions might work instead.
<?php
function _strnatcasecmp($left, $right) {
 return _strnatcmp(strtolower($left), strtolower($right));
}
function _strnatcmp($left, $right) {
 while((strlen($left) > 0) && (strlen($right) > 0)) {
   if(preg_match('/^([^0-9]*)([0-9].*)$/Us', $left, $lMatch)) {
     $lTest = $lMatch[1];
     $left = $lMatch[2];
   } else {
     $lTest = $left;
     $left = '';
   }
   if(preg_match('/^([^0-9]*)([0-9].*)$/Us', $right, $rMatch)) {
     $rTest = $rMatch[1];
     $right = $rMatch[2];
   } else {
     $rTest = $right;
     $right = '';
   }
   $test = strcmp($lTest, $rTest);
   if($test != 0) {
     return $test;
   }
   if(preg_match('/^([0-9]+)([^0-9].*)?$/Us', $left, $lMatch)) {
     $lTest = intval($lMatch[1]);
     $left = $lMatch[2];
   } else {
     $lTest = 0;
   }
   if(preg_match('/^([0-9]+)([^0-9].*)?$/Us', $right, $rMatch)) {
     $rTest = intval($rMatch[1]);
     $right = $rMatch[2];
   } else {
     $rTest = 0;
   }
   $test = $lTest - $rTest;
   if($test != 0) {
     return $test;
   }
 }
 return strcmp($left, $right);
}
?>
The code is not optimized. It was just made to solve my problem.


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