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image_util.php
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<?php
function dealjpg($target_img, $w, $h,$x, $y, $original_width, $original_height, $target_width, $target_height,$filename)
{
// 剪裁
$source=imagecreatefromjpeg($target_img); //创建一个新图象
$croped=imagecreatetruecolor($w, $h); //新建一个真彩色图像
imagecopy($croped, $source, 0, 0, $x, $y, $original_width, $original_height); //拷贝图像的一部分
// 缩放
$scale = $target_width / $w;
$target = imagecreatetruecolor($target_width, $target_height); //新建一个真彩色图像
$final_w = intval($w * $scale);
$final_h = intval($h * $scale);
imagecopyresampled($target, $croped, 0, 0, 0, 0, $final_w,$final_h, $w, $h); //重采样拷贝部分图像并调整大小
// 保存
imagejpeg($target, 'user_headpic/'.$filename.'.jpg');
imagedestroy($target);
}
function dealpng($target_img,$w,$h,$x,$y,$original_width,$original_height,$target_width,$target_height,$filename)
{
// 剪裁
$source=imagecreatefrompng($target_img);
$croped=imagecreatetruecolor($w, $h); //新建一个真彩色图像
imagecopy($croped, $source, 0, 0, $x, $y, $original_width, $original_height); //拷贝图像的一部分
// 缩放
$scale = $target_width / $w;
$target = imagecreatetruecolor($target_width, $target_height); //新建一个真彩色图像
$final_w = intval($w * $scale);
$final_h = intval($h * $scale);
imagecopyresampled($target, $croped, 0, 0, 0, 0, $final_w,$final_h, $w, $h); //重采样拷贝部分图像并调整大小
// 保存
imagepng($target, 'user_headpic/'.$filename.'.png');
imagedestroy($target);
}
function deal($target_width,$target_height,$target_img,$filename)
{
$img_info=getimagesize($target_img); // 获取原图尺寸
$original_width=$img_info[0]; //原图片宽度
$original_height=$img_info[1]; //原图片高度
$original_mime=$img_info['mime'];
$type=substr($original_mime,6); //原本$original_mime值为'image/类型'，通过从第六位字符开始截取得到图片类型
$target_scale = $target_height/$target_width; //目标图像长宽比
$original_scale = $original_height/$original_width; // 原图片长宽比
if ($original_scale>=$target_scale){ // 过高
$w = intval($original_width);
$h = intval($target_scale*$w);
$x = 0;
$y = ($original_height - $h)/2;
} else { // 过宽
$h = intval($original_height);
$w = intval($h/$target_scale);
$x = ($original_width - $w)/2;
$y = 0;
}
switch($type){
case 'jpg':
case 'jpeg':
dealjpg($target_img, $w, $h,$x, $y, $original_width, $original_height, $target_width, $target_height, $filename); //调用处理jpg函数
break;
case 'png':
dealpng($target_img, $w, $h,$x, $y, $original_width, $original_height, $target_width, $target_height, $filename); //调用处理png函数
break;
default:
echo "图片类型不正确";
break;
}
}
function show_headpic_200($uid)
{
$file_prefix = 'user_headpic/'.$uid;
if(file_exists($file_prefix.'_200.jpg')) echo '<img src="'.$file_prefix.'_200.jpg">';
else if(file_exists($file_prefix.'_200.jpeg')) echo '<img src="'.$file_prefix.'_200.jpeg">';
else if(file_exists($file_prefix.'_200.png')) echo '<img src="'.$file_prefix.'_200.png">';
else echo '<img src="user_headpic/0_200.jpg">';
}
function show_headpic_60($uid)
{
$file_prefix = 'user_headpic/'.$uid;
if(file_exists($file_prefix.'_60.jpg')) echo '<img src="'.$file_prefix.'_60.jpg">';
else if(file_exists($file_prefix.'_60.jpeg')) echo '<img src="'.$file_prefix.'_60.jpeg">';
else if(file_exists($file_prefix.'_60.png')) echo '<img src="'.$file_prefix.'_60.png">';
else echo '<img src="user_headpic/0_60.jpg">';
}
?>