Community
Learn
Tools Library
AI Tools
Leisure
search
English
Home > Backend Development > PHP Tutorial > In-depth discussion on how to improve PHP operating efficiency_PHP Tutorial

In-depth discussion on how to improve PHP operating efficiency_PHP Tutorial

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
Release： 2016-07-15 13:31:26
Original
929 people have browsed it

As we all know, Improve PHP operating efficiency 1. In a function, when passing an array

using return is more efficient than using global

For example

  1. function userloginfo($usertemp){
  2. $detail=explode("|",$usertemp);
  3. return $detail;
  4. } 🎜>
    5. =
  5. userloginfo($userdb); Than

function userloginfo($usertemp){

    global $detail;
  1. $
  2. detail
    3. =
  3. explode("|",$usertemp); } userloginfo($userdb);
  4. Be efficient
  5. Improve PHP operating efficiency 2, (this code is used to get the URL corresponding to the program directory, recommended)

This code is more efficient than 

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute">urlarray</span><span>=</span><span class="attribute-value">explode</span><span>('/',$HTTP_<br>SERVER_VARS['REQUEST_URI']);   </span></span></li>
<li>
<span>$</span><span class="attribute">urlcount</span><span>=count($urlarray);unset<br>($urlarray[$urlcount-1]);   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">ofstarurl</span><span>=</span><span class="attribute-value">'http://'</span><span>.<br>$HTTP_SERVER_VARS['HTTP_HOST'].<br>implode('/',$urlarray);  </span>
</li>
</ol>
Copy after login

Improve PHP running efficiency 3

,

in the loop When making judgments, it is more efficient to use identity ratio for numerical judgment 
<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute">pre_urlarray</span><span>=</span><span class="attribute-value">explode</span><span>('/',$HTTP_SERVER_VARS['HTTP_REFERER']);   </span></span></li>
<li>
<span>$</span><span class="attribute">pre_url</span><span>=</span><span class="attribute-value">array_pop</span><span>($pre_urlarray); </span>
</li>
</ol>
Copy after login

, such as 

<ol class="dp-xml"><li class="alt"><span><span>$</span><span class="attribute">a</span><span>=</span><span class="attribute-value">2</span><span>;$</span><span class="attribute">b</span><span>=</span><span class="attribute-value">2</span><span>;  </span></span></li></ol>
Copy after login
More efficient than 

<ol class="dp-xml"><li class="alt"><span><span>if($</span><span class="attribute">a</span><span>==$b)$</span><span class="attribute">c</span><span>=$a;   </span></span></li></ol>
Copy after login

to improve PHP operating efficiency 4,

mysql Try to use where in when querying and use less limit
<ol class="dp-xml"><li class="alt"><span><span>if($</span><span class="attribute">a</span><span>===$b)$</span><span class="attribute">c</span><span>=$a;  </span></span></li></ol>
Copy after login

limit checks the first few records of multiple records, which is very fast, but querying the top few records will be slow.

Use in. When querying continuous records, it is very fast and non-continuous. The first run of the record will be a little slower, but it will be faster after that!

Improve PHP operating efficiency 5,

NT server data operation stability is not as good as unix/linux

Improve PHP operating efficiency 6,

Try to use ob_start() before output; it can speed up the output, suitable for NT or nuli/linux, for unlix servers. Use ob_start('ob_gzhandler'); the output efficiency will be higher

Improve PHP operating efficiency 7,

Try to use if ($a==his value) Try to use if(empty($a)) when negating, because this way the program runs faster

Improving PHP operating efficiency 8,

Use unequal time != is equivalent to < >

Improve PHP operating efficiency 9,

My personal experience is to use $a="11111111111111"; for the efficiency and $a= '11111111111111'; Quite. It is not very different as the book says.

Improve PHP operating efficiency 10,

Using standardized SQL statements will be beneficial to MySQL. Analysis of

Improving PHP operating efficiency 11

,Using

COOKIE will be done immediately To take effect

Use

<ol class="dp-xml">
<li class="alt"><span><span>if($online){   </span></span></li>
<li>
<span>$</span><span class="attribute">online1</span><span>=$online;   </span>
</li>
<li class="alt"><span>setcookie('online1',$online,<br>$cookietime,$ckpath,$ckdomain,$secure);   </span></li>
<li><span>}  </span></li>
</ol>
Copy after login

COOKIE needs to be refreshed again to take effect

Improve PHP operating efficiency 12 ,

<ol class="dp-xml">
<li class="alt"><span><span>if($online)   </span></span></li>
<li><span>setcookie('online1',$online,<br>$cookietime,$ckpath,$ckdomain,$secure);  </span></li>
</ol>
Copy after login

using

is better than

both in terms of speed and stability. Excellent 

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute">handle</span><span>=</span><span class="attribute-value">fopen</span><span>($filename,wb);   </span></span></li>
<li><span>flock($handle,LOCK_SH);   </span></li>
<li class="alt">
<span>$</span><span class="attribute">filedata</span><span>=</span><span class="attribute-value">fread</span><span>($handle,<br>filesize($filename));   </span>
</li>
<li><span>fclose($handle);  </span></li>
</ol>
Copy after login

Improve PHP operating efficiency 13, truncate string optimization function (can avoid the appearance of ? characters) 

<ol class="dp-xml"><li class="alt"><span><span>file($filename);  </span></span></li></ol>
Copy after login

For example,

Improve PHP running efficiency 14, shield case in the program
<ol class="dp-xml">
<li class="alt"><span><span>ifunction substrs($content,$length) {   </span></span></li>
<li>
<span>if(strlen($content)</span><span class="tag">></span><span>$length){   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">num</span><span>=</span><span class="attribute-value">0</span><span>;   </span>
</li>
<li>
<span>for($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><</span><span>$length-3;$i++) {   </span></li><li class="alt"><span>if(ord($content[$i])</span><span class="tag">></span><span>127)$num++;   </span>
</li>
<li><span>}   </span></li>
<li class="alt">
<span>$num%</span><span class="attribute">2</span><span>==1 ? $</span><span class="attribute">content</span><span>=</span><span class="attribute-value">substr</span><span>(<br>$content,0,$length-4):$</span><span class="attribute">content<br></span><span>=</span><span class="attribute-value">substr</span><span>($content,0,$length-3);   </span>
</li>
<li>
<span>$</span><span class="attribute">content.</span><span>=</span><span class="attribute-value">' ...'</span><span>;   </span>
</li>
<li class="alt"><span>}   </span></li>
<li><span>return $content;   </span></li>
<li class="alt"><span>}   </span></li>
</ol>
Copy after login

<ol class="dp-xml"><li class="alt"><span><span>$newarray[1]=substrs($newarray[1],25); </span></span></li></ol>
Copy after login

Improve PHP running efficiency Efficiency 15, do not use file(); and do not use fget(); (unstable or slow) Take an array function 

<ol class="dp-xml">
<li class="alt"><span><span>for ($</span><span class="attribute">asc</span><span>=</span><span class="attribute-value">65</span><span>;$asc</span><span class="tag"><</span><span>=90;$asc++)   </span></span></li><li><span>{ //strtolower() 此函数在一些服务<br />器会产生乱码!   </span></li><li class="alt"><span>if (strrpos($regname,chr($asc))!==false)   </span></li><li><span>{   </span></li><li class="alt"><span>$</span><span class="attribute">error</span><span>=</span><span class="attribute-value">"为了避免用户名混乱,用户名<br />中禁止使用大写字母，请使用小写字母"</span><span>;   </span></li><li><span>$</span><span class="attribute">reg_check</span><span>=</span><span class="attribute-value">0</span><span>;   </span></li><li class="alt"><span>}   </span></li><li><span>} </span></li></ol>
Copy after login

Although the code of this function is relatively There are many, but it has great advantages in improving PHP operating efficiency in terms of speed and stability! 

<ol class="dp-xml"><li class="alt"><span><span>function openfile($filename,$</span><span class="attribute">method</span><span>=</span><span class="attribute-value">"rb"</span><span>)   </span></span></li><li><span>{   </span></li><li class="alt"><span>$</span><span class="attribute">handle</span><span>=@fopen($filename,$method);   </span></li><li><span>@flock($handle,LOCK_SH);   </span></li><li class="alt"><span>@$</span><span class="attribute">filedata</span><span>=</span><span class="attribute-value">fread</span><span>($handle,filesize<br />($filename));   </span></li><li><span>@fclose($handle);   </span></li><li class="alt"><span>$</span><span class="attribute">filedata</span><span>=</span><span class="attribute-value">str_replace</span><span>("n","<br />n</span><span class="tag"><</span><span class="tag-name">ofstar:</span><span class="tag">></span><span>",$filedata);   </span></span></li>
<li>
<span>$</span><span class="attribute">filedb</span><span>=</span><span class="attribute-value">explode</span><span>("</span><span class="tag"><</span><span class="tag-name">ofstar:</span><span class="tag">></span><span>",$filedata);   </span>
</li>
<li class="alt"><span>//array_pop($filedb);   </span></li>
<li>
<span>$</span><span class="attribute">count</span><span class="attribute-value">count</span><span>=count($filedb);   </span>
</li>
<li class="alt"><span>if($filedb[$count-1]==''){unset<br>($filedb[$count-1]);}   </span></li>
<li><span>return $filedb;   </span></li>
<li class="alt"><span>}  </span></li>
</ol>
Copy after login

http://www.bkjia.com/PHPjc/446216.html

www.bkjia.com


true

http: //www.bkjia.com/PHPjc/446216.html

Everyone knows that to improve PHP operating efficiency 1, in functions, using return when passing arrays is more efficient than using global For example, functionuserloginfo($usertemp){ $ detail = explode (|,$userte...
Related labels：
php transfer use function exist how Discuss improve efficiency array hour go deep Know run
source：php.cn
Previous article：Discuss in detail how to implement PHP HTML interception code_PHP tutorial Next article：Installation and advanced use of PHP APC_PHP tutorial
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
javascript - Error when uploading local project to github
From 1970-01-01 08:00:00
0
0
0
javascript - How can I display text instead of dots by default before the password is entered on the registration page?
From 1970-01-01 08:00:00
0
0
0
Team collaboration - What should I do if someone needs the feature I wrote as a dependency in git flow?
From 1970-01-01 08:00:00
0
0
0
Objective-c - Constraints for iOS a warning issue
From 1970-01-01 08:00:00
0
0
0
Confusion about using gitlab's fork&pull request mode within the team
From 1970-01-01 08:00:00
0
0
0
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template