strnatcasecmp

(PHP 4, PHP 5, PHP 7, PHP 8)

strnatcasecmp使用“自然顺序”算法比较字符串(不区分大小写)

说明

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

该函数实现了以人类习惯对数字型字符串进行排序的比较算法。除了不区分大小写,该函数的行为与 strnatcmp() 类似。更多信息,参见:Martin Pool 的» 自然顺序的字符串比较页面。

参数

string1

第一个字符串。

string2

第二个字符串。

返回值

与其他字符串比较函数类似,如果 string1 小于 string2 返回 -1; 如果 string1 大于 string2 返回 1;如果两者相等,返回 0

更新日志

版本 说明
8.2.0 现在此函数返回 -1 或者 1,之前返回负数或正数。

示例

示例 #1 strnatcasecmp() 示例

<?php

var_dump
(strnatcasecmp('Apple', 'Banana'));
var_dump(strnatcasecmp('Banana', 'Apple'));
var_dump(strnatcasecmp('apple', 'Apple'));
?>

以上示例会输出:

int(-1)
int(1)
int(0)

参见

  • preg_match() - 执行匹配正则表达式
  • strcmp() - 二进制安全字符串比较
  • strcasecmp() - 二进制安全比较字符串(不区分大小写)
  • substr() - 返回字符串的子串
  • stristr() - strstr 函数的忽略大小写版本
  • strncasecmp() - 二进制安全比较字符串开头的若干个字符(不区分大小写)
  • strncmp() - 二进制安全比较字符串开头的若干个字符
  • strstr() - 查找字符串的首次出现
  • setlocale() - 设置区域信息

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User Contributed Notes 3 notes

up
9
chatfielddaniel at googlemail dot com
13 years ago
The function treats '_' as after letters and numbers when it would be placed before logically.
up
2
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. >>
up
-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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