Php Image Resize图片大小调整的函数代码

复制代码 代码如下:

function my_image心情微语_resize($src_file, $dst_file, $dst_width=32, $dst_height=32) {

if($dst_width <1 ||铁路运输安全保护条例 $dst_height <1) {

echo “params width or height error !”;

exit();

}

if(!file_exists($src_file)) {

echo $src_file . ” is not exists !”;

exit();

}

$type=exif_imagetype($src_file);

$support_type=array(imagetype_jpeg , imagetype_png , imagetype_gif);

if(!in_array($type, $support_type,true)) {

echo “this type of image does not support! only support jpg , gif or png”;

exit();

}

switch($type) {

ca imagetype_jpeg :

$src_img=imagecreatefromjpeg($src_file);

break;

ca imagetype_png :

$src_img=imagecreatefrompng($src_file);

break;

ca imagetype_gif :

$src_img=imagecreatefromgif($src_file);

break;

default:

echo “load image error!”;

exit();

}

$src_w=imagesx($src_img);

$src_h=imagesy($src_img);

$ratio_庶是什么意思w=1.0 * $dst_width/$src_w;

$ratio_h=1.0 * $dst_height/$src_h;

if ($src_w<=$dst_width && $src_h<=$dst_height) {

$x = ($dst_width-$src_w)/2;

$y = ($dst_height-$src_h)/2;

$new_img=imagecreatetruecolor($dst_width,$dst_height);

imagecopy($new_img,$src_img,$x,$y,0,0,$dst_width,$dst_height);

switch($type) {

ca imagetype_jpeg :

imagejpeg($new_img,$dst_file,100);

break;

ca imagetype_png :

imagepng($new_img,$dstcpu盒装和散装的区别_file);

break;

ca imagetype_gif :

imagegif($new_img,$dst_file);

break;

default:

break;

}

} el {

$dstwh = $dst_width/$dst_height;

$srcwh = $src_w/$src_h;

if ($ratio_w <= $ratio_h) {

$zoom_w = $dst_width;

$zoom_h = $zoom_w*($src_h/$src_w);

} el {

$zoom_h = $dst_height;

$zoom_w = $zoom_h*($src_w/$src_h);

}

$zoom_img=imagecreatetruecolor($zoom_w, $zoom_h);

imagecopyresampled($zoom_img,$src_img,0,0,0,0,$zoom_w,$zoom_h,$src_w,$src_h);

$new_img=imagecreatetruecolor($dst_width,$dst_height);

$x = ($dst_width-$zoom_w)/2;

$y = ($dst_height-$zoom_h)/2+1;

imagecopy($new_img,$zoom_img,$x,$y,0,0,$dst_width,$dst_height);

switch($type) {

ca imagetype_jpeg :

imagejpeg($new_img,$dst_file,100);

break;

ca imagetype_png :

imagepng($new_img,$dst_file);

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ca imagetype_gif :

imagegif($new_img,$dst_file);

break;

default:

break;

}

}

}