php性能效率优化
1，在可以用file_get_contents替代file,fopen,feof,fget等系列方法的情况下，尽量使用feil_get_contents，因为它的效率高得多！但是要注意file_get_contents在打开url文件时的php版本问题
2，尽量的少进行文件操作，虽然php的文件操作效率也不低
3，优化select sql语句，在可能的情况下尽量少的进行insert，update操作
4，尽可能的使用php内部函数，（经验问题，不要浪费时间在寻找php内部函数上，）
5，讯混内部不要声明变量，尤其是大变量，
6，多维数组尽量不要循环嵌套赋值
7，在可以用php内部字符操作函数的情况下，不要使用正则表达式
8，foreach效率更高，尽量用foreach代替while和for循环
9，用单引号代替双引号引用字符串
10，用i+=1代替i=i+1 ，符合C/C++的习惯，效率还比较高
11，对global变量，用完应该unset（）掉
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