[英]php resize image after upload and crop it to the center
我在php中有一個用戶個人資料,我想給用戶選擇更改其個人資料圖片的選擇。 但是當他們通過$ _POST提交新圖片時,我希望將圖片調整為:
高度:110像素| 寬度:與高度有關(如果寬度大於高度)
寬度:110像素| height:與寬度有關(如果高度大於寬度)
調整大小后,我想裁剪圖片,使其變為110px x 110px,但我希望將其居中。
例如,如果用戶上載寬度為110像素,高度為200像素(調整尺寸后的尺寸)的圖片,則裁剪后的新圖像將為110x110,從右側裁剪90像素。 我想要的是從左側裁切45px,從右側裁切另一個45px,以便將其居中
該函數將接受.png
, .gif
和.jpg
圖像,並且無論初始格式是什么,都將僅以jpg格式保存新圖像。
我進行了很多搜索以創建這樣的函數,並且找到了答案,但是每當我嘗試更改一些細微的細節時,一切都會停止正常工作。
<?php
$userfile_name = $_FILES["sgnIMG"]["name"];
$userfile_tmp = $_FILES["sgnIMG"]["tmp_name"];
$userfile_size = $_FILES["sgnIMG"]["size"];
$filename = basename($_FILES["sgnIMG"]["name"]);
$file_ext = substr($filename, strrpos($filename, ".") + 1);
$large_image_location = $target_path . $filename;
$ext = '';
if ($file_ext == 'jpg') {
$ext = 1;
} else if ($file_ext == 'gif') {
$ext = 2;
} else if ($file_ext == 'png') {
$ext = 3;
} else {
$ext = 0;
}
$target = $target_path . basename($_FILES["sgnIMG"]["name"]);
if (move_uploaded_file($userfile_tmp, $target)) {
$newImg = resize110($target, $ext);
if (isset($_POST['imupd']) && ($_POST['imupd'] == 'up')) {
$sql = "UPDATE users SET avatar='" . str_replace('im/users/', '', $newImg) . "' WHERE id=" . $_SESSION['sesID'] . "";
$result = mysql_query($sql);
if ($result) {
echo '<img src="' . $newImg . '" width="110" title="' . $file_ext . '"/>';
} else {
echo '<img src="im/avatars/px.png" width="110" title="' . $file_ext . '"/>';
}
}
} else {
}
function getHeight($image)
{
$sizes = getimagesize($image);
$height = $sizes[1];
return $height;
}
function getWidth($image)
{
$sizes = getimagesize($image);
$width = $sizes[0];
return $width;
}
function resize110($image, $ext)
{
chmod($image, 0777);
$oldHeight = getHeight($image);
$oldWidth = getWidth($image);
if ($oldHeight < $oldWidth) {
$newImageHeight = 110;
$newImageWidth = ceil((110 * $oldWidth) / $oldHeight);
imagecopyresampled($newImage, $source, -ceil(($newImageWidth - 110) / 2), 0, 0, 0, $newImageWidth, $newImageHeight, $oldWidth, $oldHeight);
} else {
$newImageHeight = ceil((110 * $oldHeight) / $oldWidth);
$newImageWidth = 110;
imagecopyresampled($newImage, $source, 0, -ceil(($newImageHeight - 110) / 2), 0, 0, $newImageWidth, $newImageHeight, $oldWidth, $oldHeight);
}
$newImage = imagecreatetruecolor(110, 110);
chmod($image, 0777);
return $image;
switch ($ext) {
case 1;
$source = imagecreatefromjpeg($image);
break;
case 2;
$source = imagecreatefromgif($image);
break;
case 3;
$source = imagecreatefrompng($image);
break;
}
imagejpeg($newImage, $image, 90);
return $image;
}
我四處張望,並組合了發現的代碼的不同部分。 因此,此腳本將采用jpg,gif的png圖像,如果寬度較大則將其大小調整為110px寬度,如果高度較大則將其調整為110px高度。 寬高比將保持不變,因此剩余像素將被2除以將圖像居中。
對於不同的大小,只需在各處更改110。
================================================== ================================
<?php
// pfpic -> the name of the <input type="file" name="pfpic"/> where user chooses file
$target_path = "im/users/"; // the directory to store the uploaded and then resampled image
$userfile_name = $_FILES["pfpic"]["name"]; // the name that the image file will have once uploaded
$userfile_tmp = $_FILES["pfpic"]["tmp_name"]; // the temporary name the server uses to store the file
$userfile_size = $_FILES["pfpic"]["size"]; // the size of the file that we want to upload
$filename = basename($_FILES["pfpic"]["name"]); // the full name of the file
$file_ext = substr($filename, strrpos($filename, ".") + 1); // the file extension
$large_image_location = $target_path.$filename; // the full path to the file
$ext='';
if($file_ext=='jpg')
{
$ext=1;
}
else if ($file_ext=='gif')
{
$ext=2;
}
else if ($file_ext=='png')
{
$ext=3;
}
else
{
$ext=0;
}
$target = $target_path.basename(sha1($_SESSION['sesID']).'.'.'jpg');
if($ext!=0)
{
if(move_uploaded_file($userfile_tmp,$target))
{
$newImg=resize110($target,$ext);
echo '<img src="'.$newImg.'"/>';
}
else
{
echo 'the file could not be uploaded, please try again';
}
}
else
{
echo 'this file extension is not accepted, please use "jpg", "gif" or "png" file formats';
}
function getHeight($image)
{
$sizes = getimagesize($image);
$height = $sizes[1];
return $height;
}
function getWidth($image)
{
$sizes = getimagesize($image);
$width = $sizes[0];
return $width;
}
function resize110($image,$ext)
{
chmod($image, 0777);
$oldHeight=getHeight($image);
$oldWidth=getWidth($image);
switch ($ext)
{
case 1;
$source = imagecreatefromjpeg($image);
break;
case 2;
$source = imagecreatefromgif($image);
break;
case 3;
$source = imagecreatefrompng($image);
break;
}
$newImage = imagecreatetruecolor(110,110);
$bgcolor = imagecolorallocate($newImage, 255, 255, 255);
imagefill($newImage, 0, 0, $bgcolor); // use this if you want to have a white background instead of black
// we check tha width and height and then we crop the image to the center
if($oldHeight<$oldWidth)
{
$newImageHeight = 110;
$newImageWidth = ceil((110*$oldWidth)/$oldHeight);
imagecopyresampled($newImage,$source,-ceil(($newImageWidth-110)/2),0,0,0,$newImageWidth,$newImageHeight,$oldWidth,$oldHeight);
}
else
{
$newImageHeight = ceil((110*$oldHeight)/$oldWidth);
$newImageWidth = 110;
imagecopyresampled($newImage,$source,0,-ceil(($newImageHeight-110)/2),0,0,$newImageWidth,$newImageHeight,$oldWidth,$oldHeight);
}
//we save the image as jpg resized to 110x110 px and cropped to the center. the old image will be replaced
imagejpeg($newImage,$image,90);
return $image;
}
?>
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