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PHP的小技艺[转]

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Release: 2016-06-13 13:05:40
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PHP的小技巧[转]
PHP的小技巧

好象,大多时候,我们对于字符串的比较都是采用了 strtolower或者strtoupper之后,再判断是否相等。只是这样就需要转换两次。大多时候,我们是针对字符集转换的时候才会这样,比如判断参数传进来是否utf-8,这5个字符的写法,可就多了,比如UTF-8,Utf-8,utf-8等,那我们怎么办呢?strtolower?strupper?不需要啦。。
strncasecmp($a,$b,$length)就可以了。。
如果返回是0则相等,那我们怎么判断呢?
strncasecmp($str,'utf-8',5) == 0那么,传入的参数就是utf8的,是否很方便呢?
只是这些函数我们平时不太用得到,我看到这个函数的用法却是在 yii framework,他在处理事件的时候,判断前两个字符是否为 on 的时候,就是这样判断的。我也因此学到了一招。

http://www.neatstudio.com/show-1477-1.shtml

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