Improve the running speed of mobile phones. PHP optimization and efficient speed-up problems. Page 1/2

1. In a function, using return when passing an array is more efficient than using global, for example:
function userloginfo($usertemp){
$detail=explode("|",$usertemp);
return $detail;
}
$ login=userloginfo($userdb);
　It is more efficient than
function userloginfo($usertemp){
global $detail;
$detail=explode("|",$usertemp);
}
userloginfo($userdb);
2. (This code is used to get the URL corresponding to the program directory, recommended)
$urlarray=explode('/',$HTTP_SERVER_VARS['REQUEST_URI']);
$urlcount=count($urlarray);unset($urlarray [$urlcount-1]);
$ofstarurl='http://'.$HTTP_SERVER_VARS['HTTP_HOST'].implode('/',$urlarray);
This code is better than
$pre_urlarray=explode('/ ',$HTTP_SERVER_VARS['HTTP_REFERER']);
$pre_url=array_pop($pre_urlarray);
Be efficient
3. When judging in a loop, use the identity ratio for numerical judgment to be efficient
　$a=2;$b =2;
　For example,
if($a==$b)$c=$a;
　It is more efficient than
if($a===$b)$c=$a;
　4. Try to use it when querying MySQL Where in, use limit less
　Limit is very fast to check the first few records of multiple records, but it will be slow to query the top few records
Use in. When querying continuous records, it is very fast, but the first run of non-continuous records will cause problems A little slower, but it will be faster in the future!
5. The data operation stability of NT server is not as good as unix/Linux
6. Try to use ob_start() before output;
can speed up the output, suitable for NT or nuli/linux, for unlix If the class server uses ob_start('ob_gzhandler'); the output efficiency will be higher
7. When judging, try to use if ($a==his value)
When negating, try to use if (empty($a)), because This way the program runs faster
8. When using unequal !=, the efficiency is equivalent to
9. From personal experience, the efficiency of using $a="11111111111111"; is equivalent to $a='11111111111111';. It is not as efficient as There is a big difference between what the books say
10. Using standardized SQL statements will be beneficial to MySQL analysis
11. Use
if($online){
$
setcookie('online1',$online,$cookietime,$ckpath ,$ckdomain,$secure);
}
　COOKIE will take effect immediately
Use
if($online)
setcookie('online1',$online,$cookietime,$ckpath,$ckdomain,$secure);
　COOKIE needs to be set again Refresh once to take effect
12. Use
$handle=fopen($filename,wb);
flock($handle,LOCK_SH);
$filedata=fread($handle,filesize($filename));
fclose($ handle);
　Compared to
file($filename);
　Excellent in both speed and stability

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