比较字符串 strcmp() strnatcmp() strcasecmp()主要用于用户账号密码登陆是否正确(PHP基础教程)
- //strcmp($a,$b) $a = $b 返回0,$a 大于 $b返回值大于0; 区分大小写
- //strcasecmp() 不区分大小写
- $a = 'nihaoma';
- $b = 'nihaoma';
- $c = 'Nihaoma';
- $d = 'wohenhao';
- $e = 'Wohenhao';
- echo strcmp($a,$b).'<br>'; //输出0
- echo strcmp($a,$c).'<br>'; //输出1
- echo strcmp($a,$d).'<br>'; //输出 -1
- echo strcmp($a,$e).'<br>'; //输出1
- echo strcasecmp($b,$c).'<br>'; //输出0
- echo strcasecmp($a,$e).'<br>'; //输出-9
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