在PHP中調整圖像大小我想編寫一些PHP代碼，自動調整通過表單上傳到147x147px的任何圖像的大小，但我不知道如何處理(我是一個相對的PHP新手)。到目前為止，我已經成功地上傳了圖片，文件類型被識別，名字被清理，但是我想在代碼中添加調整大小的功能。例如，我有一個測試映像，它是2.3MB，維度是1331x1331，我希望代碼能夠縮小它的大小，我猜這也會極大地壓縮圖像的文件大小。到目前為止，我得到了以下信息：if ($_FILES) {
//Put file properties into variables
$file_name = $_FILES['profile-image']['name'];
$file_size = $_FILES['profile-image']['size'];
$file_tmp_name = $_FILES['profile-image']['tmp_name'];
//Determine filetype
switch ($_FILES['profile-image']['type']) {
case 'image/jpeg': $ext = "jpg"; break;
case 'image/png': $ext = "png"; break;
default: $ext = ''; break;
}
if ($ext) {
//Check filesize
if ($file_size < 500000) {
//Process file - clean up filename and move to safe location
$n = "$file_name";
$n = ereg_replace("[^A-Za-z0-9.]", "", $n);
$n = strtolower($n);
$n = "avatars/$n";
move_uploaded_file($file_tmp_name, $n);
} else {
$bad_message = "Please ensure your chosen file is less than 5MB.";
}
} else {
$bad_message = "Please ensure your image is of filetype .jpg or.png.";
}
}$query = "INSERT INTO users (image) VALUES ('$n')";mysql_query($query) or die("Insert failed. " . mysql_error()
. "<br />" . $query);
3 回答
慕的地8271018
TA貢獻1796條經驗 獲得超4個贊
function resize_image($file, $w, $h, $crop=FALSE) {
list($width, $height) = getimagesize($file);
$r = $width / $height;
if ($crop) {
if ($width > $height) {
$width = ceil($width-($width*abs($r-$w/$h)));
} else {
$height = ceil($height-($height*abs($r-$w/$h)));
}
$newwidth = $w;
$newheight = $h;
} else {
if ($w/$h > $r) {
$newwidth = $h*$r;
$newheight = $h;
} else {
$newheight = $w/$r;
$newwidth = $w;
}
}
$src = imagecreatefromjpeg($file);
$dst = imagecreatetruecolor($newwidth, $newheight);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
return $dst;}$img = resize_image(‘/path/to/some/image.jpg’, 200, 200);
慕妹3146593
TA貢獻1820條經驗 獲得超9個贊
// for jpg function resize_imagejpg($file, $w, $h) {
list($width, $height) = getimagesize($file);
$src = imagecreatefromjpeg($file);
$dst = imagecreatetruecolor($w, $h);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $w, $h, $width, $height);
return $dst;}
// for pngfunction resize_imagepng($file, $w, $h) {
list($width, $height) = getimagesize($file);
$src = imagecreatefrompng($file);
$dst = imagecreatetruecolor($w, $h);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $w, $h, $width, $height);
return $dst;}// for giffunction resize_imagegif($file, $w, $h) {
list($width, $height) = getimagesize($file);
$src = imagecreatefromgif($file);
$dst = imagecreatetruecolor($w, $h);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $w, $h, $width, $height);
return $dst;} // jpg change the dimension 750, 450 to your desired values
$img = resize_imagejpg('path/image.jpg', 750, 450);$img
// again for jpg imagejpeg($img, 'path/newimage.jpg');
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