之前已经分析过strtr的源码了，现在就比较strtr, str_replace和preg_replace的效率：复制代码 代码如下:$str = ‘111111110000000000000000000000000000000111000001000100010000010010000010010000010100000010‘; $str = str_repeat($str, 1); $pattern1 = array(‘12345’=>”, ‘67891’=>”); $pattern2 = array(‘a’=>”, ‘1234567890’=>”); $pattern3 = ‘/123
