php生成多尺寸缩略图记录

 

在进行缩略图生成的时候，图片的大小总是会同时保存好几个尺寸的，那该怎么处理呢？

$filename = 'meinv.jpg';



list($src_w,$src_h,$imageTypeNum) = getimagesize($filename);



//获取图片mime类型 image_type_to_mime_type(int imagetype); image/jpeg

$imageTypeMime = image_type_to_mime_type($imageTypeNum);



//拼凑出 imagecreatefromjpeg()

$createFun = str_replace('/','createfrom',$imageTypeMime);



//拼凑出imagejpeg()

$outFun = str_replace('/',null,$imageTypeMime);



//创建图片源

$src_img = $createFun($filename);



//创建缩略图片

$dst_50_image = imagecreatetruecolor(50,50);

$dst_220_image = imagecreatetruecolor(220,220);

$dst_350_image = imagecreatetruecolor(350,350);

$dst_800_image = imagecreatetruecolor(800,800);



//生成缩略图

imagecopyresampled($dst_50_image,$src_img,0, 0, 0, 0, 50,50,$src_w,$src_h);

imagecopyresampled($dst_220_image,$src_img,0, 0, 0, 0, 220,220,$src_w,$src_h);

imagecopyresampled($dst_350_image,$src_img,0, 0, 0, 0, 350,350,$src_w,$src_h);

imagecopyresampled($dst_800_image,$src_img,0, 0, 0, 0, 800,800,$src_w,$src_h);



//输出缩略图

$outFun($dst_50_image,'./images_50/'.'50_'.$filename);

$outFun($dst_220_image,'./images_220/'.'220_'.$filename);

$outFun($dst_350_image,'./images_350/'.'350_'.$filename);

$outFun($dst_800_image,'./images_800/'.'800_'.$filename);



//销毁图片

imagedestroy($src_img);

imagedestroy($dst_50_image);

imagedestroy($dst_220_image);

imagedestroy($dst_350_image);

imagedestroy($dst_800_image);

 

 

效果如下：

 

上述的code的核心，就是通过图片mime类型拼凑出 imagecreatefromjpeg() 、imagecreatefrompng()、imagejpeg() 、imagepng() 等函数调用… ~~！