复制代码 代码如下:
/**
* Images类是一个图片处理类
* @package application.controllers
* @since 1.0
*/
class Images
{
/**
* 缩放图片
* @param $source原图片
* @param $newfile新图片
* @param $pre缩放比例
*/
public function thumn($source,$pre,$newfile)
{
//获取图片尺寸
list($s_w,$s_h)=getimagesize($source);
//生成新的图片尺寸
$new_w=$s_w*$pre;
$new_h=$s_h*$pre;
//创建新的图像
$new_f=imagecreatetruecolor($new_w, $new_h);
//用资源图片创建图像
$sour_f=imagecreatefromjpeg($source);
//拷贝资源图片到新图像
imagecopyresampled($new_f, $sour_f, 0, 0, 0, 0, $new_w, $new_h, $s_w, $s_h);
//输出图片到浏览器
imagejpeg($new_f,$newfile);
imagedestroy($new_f);
imagedestroy($sour_f);
}
}
?>

ThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin

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PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

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