/** * * *等比缩放 * @param unknown_type $srcimage 源图片路径 * @param unknown_type $tofile 目标图片路径 * @param unknown_type $maxwidth 最大宽 * @param unknown_type $maxheight 最大高 * @param unknown_type $imgquality 图片质量 * @return unknown */ function resize($srcimage,$tofile,$maxwidth = 100,$maxheight = 100,$imgquality=100) { list($width, $height, $type, $attr) = getimagesize($srcimage); if($width switch ($type) { case 1: $img = imagecreatefromgif($srcimage); break; case 2: $img = imagecreatefromjpeg($srcimage); break; case 3: $img = imagecreatefrompng($srcimage); break; } $scale = min($maxwidth/$width, $maxheight/$height); //求出绽放比例 if($scale $newwidth = floor($scale*$width); $newheight = floor($scale*$height); $newimg = imagecreatetruecolor($newwidth, $newheight); imagecopyresampled($newimg, $img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); $newname = ; $tofile = preg_replace(/(.gif|.jpg|.jpeg|.png)/i,,$tofile); switch($type) { case 1: if(imagegif($newimg, $tofile$newname.gif, $imgquality)) return $newname.gif; break; case 2: if(imagejpeg($newimg, $tofile$newname.jpg, $imgquality)) return $newname.jpg; break; case 3: if(imagepng($newimg, $tofile$newname.png, $imgquality)) return $newname.png; break; default: if(imagejpeg($newimg, $tofile$newname.jpg, $imgquality)) return $newname.jpg; break; } imagedestroy($newimg); } imagedestroy($img); return false; }
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