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php实现图片按比例截取的方法

墨辰丷

Lepaskan： 2023-03-28 07:44:02

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1226 orang telah melayarinya

这篇文章主要介绍了php实现图片按比例截取的方法,涉及php针对图形的读取、运算及生成相关操作技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了php实现图片按比例截取的方法。分享给大家供大家参考，具体如下：

filename = &#39;img/test.jpg&#39;;
$all_type = array(
"jpg"  => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg"  , "exn"=>".jpg"),
"gif"  => array("create"=>"ImageCreateFromGIF" , "output"=>"imagegif"  , "exn"=>".gif"),
"jpeg"  => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg"  , "exn"=>".jpg"),
"png"  => array("create"=>"imagecreatefrompng" , "output"=>"imagepng"  , "exn"=>".png"),
"wbmp"  => array("create"=>"imagecreatefromwbmp", "output"=>"image2wbmp" , "exn"=>".wbmp")
);
$imgtype = getimagesize($filename);
$width = $imgtype[0];
$height = $imgtype[1];
$type = str_replace(&#39;image/&#39;,&#39;&#39;,$imgtype[&#39;mime&#39;]);
$func_create = $all_type[$type][&#39;create&#39;];
$func_output = $all_type[$type][&#39;output&#39;];
$x = $y =0;
if(($width * 100)>($height * 120))
{
$newwidth = ceil($height * 120/100);
$newheight = $height;
$x = ($width-$newwidth)/2;
}
elseif(($width * 100)<($height * 120))
{
$newheight = ceil($width * 100/120);
$newwidth = $width;
$y = ($height-$newheight)/2;
}
else
{
$newheight = $height;
$newwidth = $width; 
}
// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = $func_create($filename);
// Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $newwidth, $newheight);
// Output
$func_output($thumb,&#39;a.jpeg&#39;);

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