function imageresize2($width, $height, $targetw, $targeth)
{
$percentage = 1;
if (($width > $targetw) || ($height > $targeth))
{
$width_diff = $width - $targetw;
$height_diff = $height - $targeth;
if ($width_diff >= $height_diff)
{
$percentage = ($targetw / $width);
}
else
{
$percentage = ($targeth / $height);
}
}
//gets the new value and applies the percentage, then rounds the value
$width = round($width * $percentage);
$height = round($height * $percentage);
$resize[0] = $width;
$resize[1] = $height;
return $resize;
} //方法二 if (!$max_width)
$max_width = 240;
if (!$max_height)
$max_height = 200;
$size = getimagesize($image);
$width = $size[0];
$height = $size[1];
$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;
if ( ($width <= $max_width) && ($height <= $max_height) ) {
$tn_width = $width;
$tn_height = $height;
}
else if (($x_ratio * $height) < $max_height) {
$tn_height = ceil($x_ratio * $height);
$tn_width = $max_width;
}
else {
$tn_width = ceil($y_ratio * $width);
$tn_height = $max_height;
}
$src = imagecreatefrompng($image);
$dst = imagecreate($tn_width,$tn_height);
imagecopyresized($dst, $src, 0, 0, 0, 0,
$tn_width,$tn_height,$width,$height);
header("content-type: image/png");
imagepng($dst, null, -1);
imagedestroy($src);
imagedestroy($dst); //方法三 /*
函數原型如下：
參數說明：
$oldwidth:原圖片寬度
$oldheight:原圖片高度
$imgwidth:縮小或放大的圖片寬度
$imgheight:縮小或放大的圖片高度
返回：wwww.111cn.net
數組：arraysize ,其中索引為：width 和height 即：arraysize['width']、arraysize['height']
*/
function getimgsize($oldwidth,$oldheight,$imgwidth,$imgheight)
{
//$oldwidth設定的寬度，$oldheight設定的高度，$imgwidth圖片的寬度，$imgheight圖片的高度； //儲存格裝得能裝得進圖片，則按圖片的真實大小顯示；
if($imgwidth<=$oldwidth&&$imgheight<=$oldheight)
{
$arraysize=array('width'=>$imgwidth,'height'=>$imgheight);
return $arraysize;
}
else
{
$suoxiaowidth=$imgwidth-$oldwidth;
$suoxiaoheight=$imgheight-$oldheight;
$suoxiaoheightper=$suoxiaoheight/$imgheight;
$suoxiaowidthper=$suoxiaowidth/$imgwidth;
if($suoxiaoheightper>=$suoxiaowidthper)
{
//儲存格高度為準；
$aftersuoxiaowidth=$imgwidth*(1-$suoxiaoheightper);
$arraysize=array('width'=>$aftersuoxiaowidth,'height'=>$oldheight);
return $arraysize;
}
else
{
//儲存格寬度為準；
$aftersuoxiaoheight=$imgheight*(1-$suoxiaowidthper);
$arraysize=array('width'=>$oldwidth,'height'=>$aftersuoxiaoheight);
return $arraysize;
}
}
} |
