PHP中strnatcmp()函数“自然排序算法”进行字符串比较用法分析(对比strcmp函数)_PHP
本文实例讲述了PHP中strnatcmp()函数“自然排序算法”进行字符串比较用法。分享给大家供大家参考,具体如下:
PHP中strnatcmp()函数使用"自然"算法来比较两个字符串(区分大小写),通常在自然算法中,数字 2 小于数字 10。而在计算机排序中,10 小于 2,这是因为 10 中的第一个数字小于 2。
strnatcmp()函数的定义如下:
strnatcmp(string1,string2)
参数说明:
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。
返回值说明:
如果两个字符串相等,则返回值为 0
如果 string1 小于 string2,则返回值小于0
如果 string1 大于 string2,则返回值大于0
示例代码如下:
<?php $str1="2.jpg"; $str2="10.jpg"; $str3="bitsCN.com_1"; $str4="BITSCN.COM_2"; echo strcmp($str1,$str2);//按字节进行比较,返回1 echo "<br/>"; echo strcmp($str3,$str4);//按字节进行比较,返1 echo "<br/>"; echo strnatcmp($str1,$str2);//按"自然排序"法进行比较,返回-1 echo "<br/>"; echo strnatcmp($str3,$str4);//按"自然排序"法进行比较,返回1 ?>
运行结果如下:
1 1 -1 1
更多关于PHP字符串操作相关内容可查看本站专题:《php字符串(string)用法总结》
希望本文所述对大家PHP程序设计有所帮助。

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