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Home Backend Development PHP Tutorial Detailed explanation of the use of PHP image processing class phpThumb

Detailed explanation of the use of PHP image processing class phpThumb

May 21, 2018 am 11:44 AM
php Detailed explanation

這次給大家?guī)?lái)PHP圖片處理類(lèi)phpThumb使用詳解,PHP圖片處理類(lèi)phpThumb使用的注意事項(xiàng)有哪些,下面就是實(shí)戰(zhàn)案例,一起來(lái)看一下。

phpThumb幾個(gè)基本參數(shù)
一些有用的參數(shù)列一下:

src:目標(biāo)圖片的地址
w:輸出圖片的寬度
h:輸出圖片的高度(如果不指定他將按w參數(shù)等比縮放)
q:輸出如果是JPG格式的,可以規(guī)定它的輸出質(zhì)量
bg:輸出時(shí)的背景(如果需要)
sw、sh、sx、sy:局部輸出,寬高、起始位置
f:輸出格式,可以為jpeg、png、gif、ico
sfn:輸出gif動(dòng)畫(huà)中的某一幀
fltr[]:濾鏡,可以有很多效果,包括銳化、模糊、旋翻轉(zhuǎn)、水印、邊框、遮照、色彩調(diào)整等

官方例程:
http://phpthumb.sourceforge.net/demo/demo/phpThumb.demo.demo.php
使用 phpThumb 和 .htaccess 來(lái)緩存縮略圖
原理:用戶(hù)訪(fǎng)問(wèn) your.com/thumbs/images/image.50×50.jpg 這樣的網(wǎng)址,腳本生成 your.com/images/image.jpg 的縮略圖,并且保存到 your.com/thumbs/images/image.50×50.jpg,下次訪(fǎng)問(wèn)就不用調(diào) PHP 啦。
簡(jiǎn)介
大約一年以前我碰到了 phpThumb 這個(gè)牛掰的腳本,它是個(gè)用來(lái)縮放圖片的開(kāi)源項(xiàng)目。當(dāng)然你可以用 GD2 或者 imagemagick(magickwand) 來(lái)干同樣的事情,但 phpThumb 是專(zhuān)門(mén)干這個(gè)的。它用起來(lái)相當(dāng)簡(jiǎn)單:

<img src="phpthumb/phpThumb.php?src=myimage.jpg&w=100&h=100">

如果訪(fǎng)問(wèn)量很大的話(huà)就撐不住了,因?yàn)?apache 要為每個(gè)圖片的請(qǐng)求去調(diào) PHP 來(lái)解析 phpThumb 的代碼。盡管 phpThumb 自己有緩存,它還是要調(diào) PHP 來(lái)決定是否從緩存里讀。
我曾經(jīng)看見(jiàn)有人用 mod_rewrite 把不存在的圖片重定向到一個(gè)可以生成縮略圖的腳本,以此來(lái)解決性能問(wèn)題:
你需要:
Apache
mod_rewrite
PHP
這些東西通常虛擬主機(jī)都有,至于怎么安裝就不在本文的討論范圍之內(nèi)了。
OK,快告訴我怎么弄吧!
上傳 phpThumb
從這里下載 phpThumb: http://phpthumb.sourceforge.net/ ,把它上傳到 yoursite.com/phpthumb
配置 Mod_Rewrite
新建 yoursite.com/thumbs/.htaccess :

<IfModule mod_rewrite.c> 
RewriteEngine on 
RewriteCond %{REQUEST_FILENAME} !-f 
RewriteCond %{REQUEST_FILENAME} !-d 
RewriteRule ^(.*)$ index.php?thumb=$1 [L,QSA] 
</IfModule>

新建縮略圖生成腳本:

新建 yoursite.com/thumbs/index.php

$thumb = $_GET[&#39;thumb&#39;]; 
if (!$thumb) { 
exit; 
} 
// 
$thumb_array = explode(&#39;.&#39;,$thumb); 
$image = &#39;../&#39;; 
foreach($thumb_array as $k=>$thumb_part){ 
if ($k != count($thumb_array)-2) { 
$image .= $thumb_part . &#39;.&#39;; 
} 
} 
$image = substr($image,0,-1); 
list($width,$height) = explode(&#39;x&#39;,$thumb_array[count($thumb_array)-2]); 
// 
if (file_exists($image)) { 
require(&#39;../phpthumb/phpthumb.class.php&#39;); 
$phpThumb = new phpThumb(); 
$phpThumb->setSourceFilename($image); 
$phpThumb->setParameter(&#39;w&#39;,$width); 
$phpThumb->setParameter(&#39;h&#39;,$height); 
//$phpThumb->setParameter(&#39;far&#39;,&#39;C&#39;); // scale outside 
//$phpThumb->setParameter(&#39;bg&#39;,&#39;<SPAN class=caps>FFFFFF</SPAN>&#39;); // scale outside 
if ($phpThumb->GenerateThumbnail()) { 
mkdir(dirname($thumb),0777,true); 
if ($phpThumb->RenderToFile($thumb)) { 
header(&#39;Location: /thumbs/&#39;.$thumb); 
exit; 
} 
} 
}

相信看了本文案例你已經(jīng)掌握了方法,更多精彩請(qǐng)關(guān)注php中文網(wǎng)其它相關(guān)文章!

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