如何在php中调整图像大小,使其适合自定义大小的框,并保持其纵横比?
我有一张400×350像素的图像。我必须把它装进一个90像素乘80像素的盒子里。每当我使用以下代码调整其大小时:如何在php中调整图像大小,使其适合自定义大小的框,并保持其纵横比?,php,Php,我有一张400×350像素的图像。我必须把它装进一个90像素乘80像素的盒子里。每当我使用以下代码调整其大小时: ****************** Create Thumbnails *************************************/ $imageEditor = new ImageEditor($image_name, $path); $imageEditor->resize(90, 80); $imageEditor->outputFile($ima
****************** Create Thumbnails *************************************/
$imageEditor = new ImageEditor($image_name, $path);
$imageEditor->resize(90, 80);
$imageEditor->outputFile($image_name, $paththumbnail);
$imageEditor->outputFile();
**************************************************************************/
在保持纵横比的情况下,输出图像在高度方面更小。
如何获得准确的图像大小?这是在php中调整图像大小的简单函数。
$thumb_width = 90;
$thumb_max_height = 80;
$imageEditor = new ImageEditor($image_name, $path);
// get the size of the image
list($width_orig, $height_orig, $image_type) = getimagesize($path . $image_name);
// calculate the aspect ratio
$aspect_ratio = (float) $height_orig / $width_orig;
// calculate new height
$thumb_height = round($thumb_width * $aspect_ratio);
while($thumb_height>$thumb_max_height)
{
$thumb_width -= 10;
$thumb_height = round($thumb_width * $aspect_ratio);
}
// resize
$imageEditor->resize($thumb_width, $thumb_height);
$imageEditor->outputFile($image_name, $paththumbnail);
$imageEditor->outputFile();
只需传递所需大小的图像
/***********************************************************
* Custom Image Resize and cropping function
***********************************************************/
function custom_resize($url, $width, $height = null, $crop = null, $single = true) {
//echo '<br>Width :'.$width.' Height'.$height;
//validate inputs
if (!$url OR !$width)
return false;
//define upload path & dir
$upload_info = wp_upload_dir();
$upload_dir = $upload_info['basedir'];
$upload_url = $upload_info['baseurl'];
//check if $img_url is local
if (strpos($url, $upload_url) === false)
return false;
//define path of image
$rel_path = str_replace($upload_url, '', $url);
$img_path = $upload_dir . $rel_path;
//check if img path exists, and is an image indeed
if (!file_exists($img_path) OR !getimagesize($img_path))
return false;
//get image info
$info = pathinfo($img_path);
$ext = $info['extension'];
list($orig_w, $orig_h) = getimagesize($img_path);
//get image size after cropping
$dims = image_resize_dimensions($orig_w, $orig_h, $width, $height, $crop);
$dst_w = $dims[4];
$dst_h = $dims[5];
//use this to check if cropped image already exists, so we can return that instead
$suffix = "{$dst_w}x{$dst_h}";
$dst_rel_path = str_replace('.' . $ext, '', $rel_path);
$destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";
if (!$dst_h) {
//can't resize, so return original url
//echo '<br>Width :'.$width.' Height'.$height;
$img_url = $url;
$dst_w = $orig_w;
$dst_h = $orig_h;
}
//else check if cache exists
elseif (file_exists($destfilename) && getimagesize($destfilename)) {
//echo '<br>Width :'.$width.' Height'.$height;
$img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
}
//else, we resize the image and return the new resized image url
else {
// Note: pre-3.5 fallback check
if (function_exists('wp_get_image_editor')) {
$editor = wp_get_image_editor($img_path);
if (is_wp_error($editor) || is_wp_error($editor->resize($width, $height, $crop)))
return false;
$resized_file = $editor->save();
if (!is_wp_error($resized_file)) {
$resized_rel_path = str_replace($upload_dir, '', $resized_file['path']);
$img_url = $upload_url . $resized_rel_path;
} else {
return false;
}
} else {
$resized_img_path = image_resize($img_path, $width, $height, $crop);
if (!is_wp_error($resized_img_path)) {
$resized_rel_path = str_replace($upload_dir, '', $resized_img_path);
$img_url = $upload_url . $resized_rel_path;
} else {
return false;
}
}
}
//return the output
if ($single) {
//str return
$image = $img_url;
} else {
//array return
$image = array(
0 => $img_url,
1 => $dst_w,
2 => $dst_h
);
}
return $image;
}
// **************** Use of these function *********************
<img src="<?php echo custom_resize($img_url,270,270,true); ?>" />
/***********************************************************
*自定义图像大小和裁剪功能
***********************************************************/
函数自定义调整大小($url、$width、$height=null、$crop=null、$single=true){
//回声'
宽度:'.$Width.'Height'.$Height;
//验证输入
如果(!$url或!$width)
返回false;
//定义上载路径&dir
$upload_info=wp_upload_dir();
$upload_dir=$upload_info['basedir'];
$upload_url=$upload_info['baseurl'];
//检查$img_url是否为本地
if(strpos($url,$upload\u url)==false)
返回false;
//定义图像的路径
$rel_path=str_replace($upload_url,,$url);
$img\u path=$upload\u dir.$rel\u path;
//检查img路径是否存在,是否确实是图像
如果(!file_存在($img_路径)或!getimagesize($img_路径))
返回false;
//获取图像信息
$info=pathinfo($img\u path);
$ext=$info['extension'];
list($orig_w,$orig_h)=getimagesize($img_path);
//获取裁剪后的图像大小
$dims=图像大小尺寸($orig\U w、$orig\U h、$width、$HEIGH、$crop);
$dst_w=$dims[4];
$dst_h=$dims[5];
//使用此选项检查裁剪后的图像是否已经存在,以便我们可以返回该图像
$suffix=“{$dst_w}x{$dst_h}”;
$dst_rel_path=str_replace('..$ext',,$rel_path);
$destfilename=“{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}”;
如果(!$dst_h){
//无法调整大小,因此返回原始url
//回声'
宽度:'.$Width.'Height'.$Height;
$img_url=$url;
$dst_w=$orig_w;
$dst_h=$orig_h;
}
//否则请检查缓存是否存在
elseif(文件存在($destfilename)&&getimagesize($destfilename)){
//回声'
宽度:'.$Width.'Height'.$Height;
$img_url=“{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}”;
}
//否则,我们将调整图像大小并返回新的调整大小的图像url
否则{
//注:3.5之前的回退检查
如果(函数_存在('wp_get_image_editor')){
$editor=wp\u get\u image\u editor($img\u path);
如果(is_wp_error($editor)| is_wp_error($editor->resize($width,$height,$crop)))
返回false;
$resized_file=$editor->save();
如果(!is_wp_error($resized_file)){
$resized_rel_path=str_replace($upload_dir,,$resized_file['path']);
$img\u url=$upload\u url.$resized\u rel\u path;
}否则{
返回false;
}
}否则{
$resized\u img\u path=image\u resize($img\u path,$width,$height,$crop);
如果(!is_wp_error($resized_img_path)){
$resized\u rel\u path=str\u replace($upload\u dir,,$resized\u img\u path);
$img\u url=$upload\u url.$resized\u rel\u path;
}否则{
返回false;
}
}
}
//返回输出
若有($单){
//str返回
$image=$img\u url;
}否则{
//数组返回
$image=array(
0=>$img\u url,
1=>$dst_w,
2=>$dst_h
);
}
返回$image;
}
//****************这些功能的使用*********************
" />
我对你的问题不太清楚。你想让你的缩略图精确到90 x 80像素吗?这意味着你必须在左右两边(80/350*400=91.4>90)剪切大约1px。这就是你想要的吗?