php中在字符串的替换模块有3个函数,str_replace(),preg_replace(),以及strtr()。在编程过程中,这三个函数的执行效率有所不同,str_replace()函数比preg_replace()函数执行效率快,而strtr()函数的执行效率又高于str_replace(),所以在变成中建议使用strtr()函数。
str_replace() 函数以其他字符替换字符串中的一些字符(区分大小写)。str_replace(find,replace,string,count)
preg_replace ()用于执行一个正则表达式的搜索和替换,一般很少使用 .mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )
strtr() 函数转换字符串中特定的字符。strtr(string,from,to)
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