PHP面试题之优化，php面试题
PHP面试题之优化，php面试题
<span> * PHP性能问题
* 1.PHP语法使用的不恰当
* 2.使用PHP语言做了它不擅长的事
* 3.使用PHP语言链接的服务不给力
* 4.PHP自身做不了的事情
*
* PHP的性能问题的解决方向
* 1.PHP语言级的性能优化(代码优化)
* 2.PHP周边问题的性能优化(linux,mysql,磁盘等)
* 3.PHP语言性能的优化(c层)
*
* 使用ab压力测试（-n请求数 -c并发数 url目标压测地址）
* ./ab -n1000 -c100 </span><span>http://www.baidu.com</span><span>
* Request per second每秒接受的请求数(越大越好)
* Time per request一个请求需要的时间(越小越好)
*
* time php test.php 测试代码执行时间
*
* vld－ PHP Opcode查看扩展
* php -dvld.active=1 -dvld.execute=0 test.php
*
* PHP代码运行流程
* *.php(PHP文件)->Scanner(扫描代码，分析)->Exprs(保存成zend引擎可以识别的文件)->Parser(解析)->Opcodes(能被执行的文件)->Exec(执行)->Output(输出结果)
* 多使用PHP内置变量，常量，函数
* php内置函数也存在差异，多使用时间复杂度低的.例isset()和array_key_exists()存在差异
* 尽可能规避使用PHP魔法函数
* 禁用@错误抑制符，会产生额外的开销
* 合理使用内存，利用unset()及时释放不使用的内存
* 尽量少使用正则表达式
* 避免在循环内做运算for($i=0;strlen($str);$i++){}
* 减少计算密集型业务(php语言特性决定了PHP不适合做大数据量运算)
* 务必使用带引号字符串做键值(key)
* 减少文件类操作 内存<<数据库<磁盘<读写网络数据
* 优化网络：1.设置超时时间 连接超时200ms 读超时800ms 写超时500 2.将串行请求并行化：使用curl_multi_*() ,使用swoole扩展
* 压缩PHP接口输出：Gzip 好处：client更快获取数据 坏处：额外的cpu开销
* PHP缓存复用
* 时间窗口重叠方法
* PHP旁路方案
* xhprof (php -ri xhprof)</span><span><br /></span>
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