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PHP开发工作经验

Jun 13, 2016 pm 12:22 PM
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PHP开发工作心得

一、扎实PHP自身的基础知识、函数、常量等,尽量用内置的方法解决问题(因为个人写的往往执行效率没有内置方法高);

二、代码尽量少的实现功能(因为PHP的执行其实是,将咱们的代码先处理成底层语言进行机器执行,如果代码多,转化的内容多自然耗时多);

三、进行优化时可以通过压力测试ab进行测试自己写的代码,并对代码进行优化后,再次压测一下效率;


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五、多使用unset()函数,将变量注销释放;

六、少用正则表达式,双刃剑;

七、避免循环for循环条件中做循环;

八、数组的key值,务必使用带引号的字符串做键值,为什么务必这么干?  

       当$arr = array(  "key"=>"hehe" );  $arr["key"] 是正确的、提高效率的

$arr[key] 这样没有引号的,是不好的,因为PHP执行时,发现key没有引号

        此时,他会去检查key是否是一个常量,如果开启错误机制报错的话会提示notice

        未发现key这个常量。如果加了 引号后,PHP会直接进入$arr数组中寻找为key的键值,

  相对效率就高效了

九、影响PHP性能的外部因素有:


此点的  启示是:  当一个网站很慢时,也许不是PHP本身的性能慢了、可能是网络问题、可能是硬件问题等;作为一个架构师排除问题所在就不能停留在程序的优化了!

十、读取内存内容要比读取数据库内容效率要低,所以说大流量提速网站往往用memcache、redis等分布式缓存将数据缓存到内存,然后先和内存进行数据的读取;


十一、通过XHPorf(源自 Facebook测试PHP性能分析 工具);可以测试出访问网站的流程,并且可以通过流程图标红的区域快速找到,耗时方法,进行方法优化即可;


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