PHP strnatcmp() 函数
PHP 教程
· 2019-01-30 09:43:19
实例
使用"自然"算法来比较两个字符串(区分大小写):
<?php
echo strnatcmp("2Hello world!","10Hello world!");
echo "<br>";
echo strnatcmp("10Hello world!","2Hello world!");
?>
echo strnatcmp("2Hello world!","10Hello world!");
echo "<br>";
echo strnatcmp("10Hello world!","2Hello world!");
?>
定义和用法
strnatcmp() 函数使用一种"自然"算法来比较两个字符串(区分大小写)。
在自然算法中,数字 2 小于数字 10。在计算机排序中,10 小于 2,这是因为 10 中的第一个数字小于 2。
注释:该函数是区分大小写的。
语法
strnatcmp(string1,string2)
参数 | 描述 |
---|---|
string1 | 必需。规定要比较的第一个字符串。 |
string2 | 必需。规定要比较的第二个字符串。 |
技术细节
返回值: | 该函数返回:
|
---|---|
PHP 版本: | 4+ |
更多实例
实例 1
自然算法(strnatcmp)和常规计算机字符串排序算法(strcmp)的不同:
<?php
$arr1 = $arr2 = array("pic1","pic2","pic10","pic01","pic100","pic20","pic30","pic200");
echo "Standard string comparison"."<br>";
usort($arr1,"strcmp");
print_r($arr1);
echo "<br>";
echo "Natural order string comparison"."<br>";
usort($arr2,"strnatcmp");
print_r($arr2);
?>
$arr1 = $arr2 = array("pic1","pic2","pic10","pic01","pic100","pic20","pic30","pic200");
echo "Standard string comparison"."<br>";
usort($arr1,"strcmp");
print_r($arr1);
echo "<br>";
echo "Natural order string comparison"."<br>";
usort($arr2,"strnatcmp");
print_r($arr2);
?>
点击查看所有 PHP 教程 文章: https://www.codercto.com/courses/l/5.html
Introduction to Linear Optimization
Dimitris Bertsimas、John N. Tsitsiklis / Athena Scientific / 1997-02-01 / USD 89.00
"The true merit of this book, however, lies in its pedagogical qualities which are so impressive..." "Throughout the book, the authors make serious efforts to give geometric and intuitive explanations......一起来看看 《Introduction to Linear Optimization》 这本书的介绍吧!