strnatcasecmp

(PHP 4, PHP 5, PHP 7)

strnatcasecmp — Case insensitive string comparisons using a "natural order" algorithm

Descrierea

strnatcasecmp ( string $string1 , string $string2 ) : int

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.

Parametri

string1: The first string.
string2: The second string.

Valorile întoarse

Similar to other string comparison functions, this one returns < 0 if string1 is less than string2 > 0 if string1 is greater than string2, and 0 if they are equal.

A se vedea și

preg_match() - Perform a regular expression match
strcmp() - Binary safe string comparison
strcasecmp() - Binary safe case-insensitive string comparison
substr() - Return part of a string
stristr() - Case-insensitive strstr
strncasecmp() - Binary safe case-insensitive string comparison of the first n characters
strncmp() - Binary safe string comparison of the first n characters
strstr() - Find the first occurrence of a string
setlocale() - Set locale information

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User Contributed Notes 3 notes

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chatfielddaniel at googlemail dot com ¶

13 years ago


The function treats '_' as after letters and numbers when it would be placed before logically.

down

Marco ¶

8 years ago


Use strnatcmp to avoid the _ problem as mentioned below;

<<  The function treats '_' as after letters and numbers when it would be placed before logically. >>

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-10

thomas at uninet dot se ¶

18 years ago


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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