While talking about bit operation, programmers usually think about its efficiency. In embedded programming and system core optimization, appropriate use of bit operations is always a fascinating. When finding a job, it will help you a lot if you use bit operations when writing codes. Mastering simple bit arithmetic skills is necessary.1. Get maximum int valueint getMaxInt(){          return (1 << 31) - 1;//2147483647，   }  Another way:int getMaxInt(){     &nbs...

0. Using single quote to replace double quote to enclose string literal, this will be a bit faster. Because PHP engine will search variables in double quoted string.1. If a method in class can be declared as static, then make it static, this will be 4 times faster.2. $row["id"] is 7 times faster than $row[id]3. echo is faster than print, and you should use multiple parameters instead of string concatenation, i.e use comma(,) instead of dot(.) to concatenate string. For example echo $str1,$str24. Calculate the numer of loops before executing for loop, don;t calculate the number of loops in each...