php实现图片按比例截取的方法_PHP教程

php实现图片按比例截取的方法

2021-04-19 16:40风起从容 PHP教程

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 = 'img/test.jpg';

									$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];

									$type = str_replace('image/','',$imgtype['mime']);

									$func_create = $all_type[$type]['create'];

									$func_output = $all_type[$type]['output'];

									$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,'a.jpeg');