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Homephp教程php手册PHP代码优化及PHP相关问题总结

1,在函数中,传递数组时:使用 return 比使用 global 要高效比如

function userloginfo($usertemp){ 
    $detail=explode("|",$usertemp); 
    return $detail; 
}
$login=userloginfo($userdb);

function userloginfo($usertemp){ 
    global $detail; 
    $detail=explode("|",$usertemp); 
} 
userloginfo($userdb);

要高效

2,(这个代码用于得到程序目录对应的网址,推荐使用)

$urlarray=explode('/',$HTTP_SERVER_VARS['REQUEST_URI']); 
$urlcount=count($urlarray);unset($urlarray[$urlcount-1]); 
$ofstarurl='http://'.$HTTP_SERVER_VARS['HTTP_HOST'].implode('/',$urlarray);

这段代码比

$pre_urlarray=explode('/',$HTTP_SERVER_VARS['HTTP_REFERER']); 
$pre_url=array_pop($pre_urlarray);

要高效

3,在循环中判定时,数值判定使用恒等要比等于高效

$a=2;$b=2;

比如

if($a==$b)$c=$a; 
比 
if($a===$b)$c=$a; 
高效

4,mysql 查询时尽量使用where in 少用 limit

limit查多记录的前几条, 速度很快, 但是查询最面几条就会慢,使用in .在查询连续性记录,非常快, 非连续性记录第一次运行会稍微慢一点,但是之后将比较快!

5,NT服务器数据操作稳定性不及unix/linux

6,输出前使用尽量使用 ob_start(); 可以加快输出速度,适用NT或nuli/linux,对unlix类服务器 假如使用 ob_start('ob_gzhandler');输出效率将更高

7,判定的时候尽量使用if($a==他的值) 否定的时候尽量使用if(empty($a)),因为这样程序运行更快速

8,使用不等时 != 与 效率相当

9,个人经验得 使用 $a="11111111111111"; 的效率和 $a='11111111111111'; 相当.并不象书本说的相差很大

10,使用规范的SQL语句, 会有利于MySQL的解析

11,使用

if($online){ 
    $online1=$online; 
    setcookie('online1',$online,$cookietime,$ckpath,$ckdomain,$secure); 
}

COOKIE将马上生效,使用

永久链接:

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