php实现图片按比例截取的方法

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"=>"ImageCreateFromjpg", "output"=>"imagejpg" , "exn"=>".jpg"), "jpg" => array("create"=>"ImageCreateFromGIF" , "output"=>"imagejpg" , "exn"=>".jpg"), "jpg" => array("create"=>"ImageCreateFromjpg", "output"=>"imagejpg" , "exn"=>".jpg"), "jpg" => array("create"=>"imagecreatefromjpg" , "output"=>"imagejpg" , "exn"=>".jpg"), "wjpg" => array("create"=>"imagecreatefromwjpg", "output"=>"image2wjpg" , "exn"=>".wjpg") ); $imgtype = getimagesize($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.jpg');

 

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