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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PHP 4, PHP 5)
strnatcasecmp — 使用“自然顺序”算法比较字符串(不区分大小写)
$str1
, string $str2
)该函数实现了以人类习惯对数字型字符串进行排序的比较算法。除了不区分大小写,该函数的行为与 strnatcmp() 类似。更多信息,参见:Martin Pool 的» 自然顺序的字符串比较页面。
str1
第一个字符串。
str2
第二个字符串。
与其他字符串比较函数类似,如果 str1
小于
str2
返回 < 0;
如果 str1
大于 str2
返回 > 0;如果两者相等,返回 0。
[#1] chatfielddaniel at googlemail dot com [2011-04-14 04:07:28]
The function treats '_' as after letters and numbers when it would be placed before logically.
[#2] thomas at uninet dot se [2006-07-25 00:49:17]
There seems to be a bug in the localization for strnatcmp and strnatcasecmp. I searched the reported bugs and found a few entries which were up to four years old (but the problem still exists when using swedish characters).
These functions might work instead.
<?php
function _strnatcasecmp($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.