说 明:$maxwidth和$maxheight只能传递一个,如果传最大宽度将自动计算高度,如果传最大高度将自动计算宽度 * 返 回 值:如果创建成功返回文件保存的地址,否则返回false
说 明:$maxwidth和$maxheight只能传递一个,如果传最大宽度将自动计算高度,如果传最大高度将自动计算宽度
* 返 回 值:如果创建成功返回文件保存的地址,否则返回false
/************************************************************************
* 函数名称:createSmallImg()
* 函数说明:创建等比例图片
* 输入参数:
$dir 保存路径
$source_img 原图片名称
$small_ex 缩率图文件名后缀
$maxwidth 最大宽度
$maxheight 最大高度
* 说 明:$maxwidth和$maxheight只能传递一个,如果传最大宽度将自动计算高度,如果传最大高度将自动计算宽度
* 返 回 值:如果创建成功返回文件保存的地址,否则返回false
* 编 写 者:李小宇
* 编写时间:2011/8/18
**************************************************************************/
function createSmallImg($dir,$source_img,$small_ex="_s",$maxwidth='',$maxheight='') {
if(!empty($maxwidth) && !empty($maxheight)) {
return false;
}
$img_name=substr($source_img,0,-4);
$img_ex = strtolower(substr(strrchr($source_img,"."),1));
/*注释的这段用作直接在浏览器上显示图片
$im=imagecreatefromjpeg($file);
header("Content-type: image/jpeg");
imagejpeg($im);*/
switch($img_ex) {
case "jpg":
$src_img=imagecreatefromjpeg($dir.$source_img);
break;
case "gif":
$src_img=imagecreatefromgif($dir.$source_img);
break;
case "png":
$src_img=imagecreatefrompng($dir.$source_img);
break;
}
$old_width=imagesx($src_img);
$old_height=imagesy($src_img);
if(!empty($maxheight) && $old_height>=$maxheight) {
$new_height=$maxheight;
$new_width=round(($old_width*$new_height)/$old_height);
} elseif(!empty($maxwidth) && $old_width>=$maxwidth) {
$new_width=$maxwidth;
$new_height=round(($old_height*$new_width)/$old_width);
}
if(!empty($new_width) || !empty($new_height)) {
if($img_ex=="jpg" || $img_ex=="png") {
$dst_img=imagecreatetruecolor($new_width,$new_height);
} else {
$dst_img=imagecreate($new_width,$new_height);
}
imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_width,$new_height,$old_width,$old_height);
$smallname=$dir.$img_name.$small_ex.".".$img_ex;
switch($img_ex) {
case "jpg":
imagejpeg($dst_img,$smallname,100);
break;
case "gif":
imagegif($dst_img,$smallname);
break;
case "png":
imagepng($dst_img,$smallname);
break;
}
}
return $smallname;
}

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