如何用PHP4进行自然排序
时间：2007-02-17 来源：PHP爱好者
对于这样几个字串：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf1
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf3
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf12
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
如果我们只是用strcmp()函数来做比较，得出的次序如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf1
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf12
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf3
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
可这显然不是我们想要的结果，一般我们的解决方法是采用在数字前加一个0，如 inf01 inf03 inf12 这样。可不可以不用加这个0也能按自然次序（nature order）排出我们想要的真正的顺序呢？
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
在PHP4中提供了这样两个函数可以做到这一点：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
int strnatcasecmp (string str1, string str2)
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
int strnatcmp(string str1, string str2)
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
它们支持的版本是：PHP4 >= 4.0RC2
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
说明如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
按自然次序（nature order）对 str1 str2 进行排序。
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
返回值 <0 表示 str1 小于 str2，
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
返回值 =0 表示 str1 等于 str2，
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
返回值 >0 表示 str1 大于 str2。
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
例子如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
<?
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str=array("a","a0","a3","a2","a10","a18","a24");
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$k=count($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "total=".$k."<br><br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "<br>用strnatcmp排序<br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
for($i=1;$i<$k;$i++){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
if(strnatcmp($str[$i-1],$str[$i])>0){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$tmp=$str[$i-1];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i-1]=$str[$i];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i]=$tmp;
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
print_r($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "<br>用strcmp排序<br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
for($i=1;$i<$k;$i++){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
if(strcmp($str[$i-1],$str[$i])>0){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$tmp=$str[$i-1];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i-1]=$str[$i];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i]=$tmp;
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
print_r($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "<br>用sort排序<br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
sort($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
print_r($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
?>
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
输出如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
total=7
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
用strnatcmp排序
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
Array ( [0] => a [1] => a0 [2] => a2 [3] => a3 [4] => a10 [5] => a18 [6] => a24 )
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
用strcmp排序
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
Array ( [0] => a [1] => a0 [2] => a2 [3] => a10 [4] => a18 [5] => a24 [6] => a3 )
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
用sort排序
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
Array ( [0] => a [1] => a0 [2] => a10 [3] => a18 [4] => a2 [5] => a24 [6] => a3 )
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
明白了吗？
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
其实这个函数也支持比较复杂一点的功能。如：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
a <a0 <a1 <a1a <a1b <a2 <a10 <a20
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
x2-g8 <x2-y7 <x2-y08 <x8-y8
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
1.001 <1.002 <1.010 <1.02 <1.1 <1.3
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
试一下吧，真得很有用。
非常全面的一个php技术网站,php爱好者站 http://www.phpfans.net 有相当丰富的文章和源代码.
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf1
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf3
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf12
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
如果我们只是用strcmp()函数来做比较，得出的次序如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf1
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf12
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
inf3
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
可这显然不是我们想要的结果，一般我们的解决方法是采用在数字前加一个0，如 inf01 inf03 inf12 这样。可不可以不用加这个0也能按自然次序（nature order）排出我们想要的真正的顺序呢？
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
在PHP4中提供了这样两个函数可以做到这一点：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
int strnatcasecmp (string str1, string str2)
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
int strnatcmp(string str1, string str2)
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
它们支持的版本是：PHP4 >= 4.0RC2
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
说明如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
按自然次序（nature order）对 str1 str2 进行排序。
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
返回值 <0 表示 str1 小于 str2，
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
返回值 =0 表示 str1 等于 str2，
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
返回值 >0 表示 str1 大于 str2。
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
例子如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
<?
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str=array("a","a0","a3","a2","a10","a18","a24");
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$k=count($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "total=".$k."<br><br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "<br>用strnatcmp排序<br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
for($i=1;$i<$k;$i++){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
if(strnatcmp($str[$i-1],$str[$i])>0){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$tmp=$str[$i-1];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i-1]=$str[$i];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i]=$tmp;
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
print_r($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "<br>用strcmp排序<br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
for($i=1;$i<$k;$i++){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
if(strcmp($str[$i-1],$str[$i])>0){
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$tmp=$str[$i-1];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i-1]=$str[$i];
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
$str[$i]=$tmp;
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
}
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
print_r($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
echo "<br>用sort排序<br>";
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
sort($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
print_r($str);
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
?>
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
输出如下：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
total=7
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
用strnatcmp排序
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
Array ( [0] => a [1] => a0 [2] => a2 [3] => a3 [4] => a10 [5] => a18 [6] => a24 )
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
用strcmp排序
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
Array ( [0] => a [1] => a0 [2] => a2 [3] => a10 [4] => a18 [5] => a24 [6] => a3 )
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
用sort排序
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
Array ( [0] => a [1] => a0 [2] => a10 [3] => a18 [4] => a2 [5] => a24 [6] => a3 )
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
明白了吗？
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
其实这个函数也支持比较复杂一点的功能。如：
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
a <a0 <a1 <a1a <a1b <a2 <a10 <a20
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
x2-g8 <x2-y7 <x2-y08 <x8-y8
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
1.001 <1.002 <1.010 <1.02 <1.1 <1.3
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
www.c hinaitpower.comlMyb83oas7CufhmSPWQOCXMs9o
试一下吧，真得很有用。
非常全面的一个php技术网站,php爱好者站 http://www.phpfans.net 有相当丰富的文章和源代码.
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