有人可以告诉我，当我在服务器上的网站上上传图片时，它会显着降低图像质量，但在我的本地主机上，这不会发生。我在网站上使用的其他图像和我的服务器上的主机显示正常。有谁知道为什么会这样。我浏览了脚本，但找不到问题所在。
这是我的上传脚本：
index.php（表格）：
<input type="file" class="droparea spot" name="xfile" data-post="upload.php" data-width="180" data-height="190" data-crop="true"/>
<form id="sampleform" action="post.php" method="post">
</form>
post.php：
<?php
// LOG
$log = '=== ' . @date('Y-m-d H:i:s') . ' ===============================' . "\n"
. 'FILES:' . print_r($_FILES, 1) . "\n"
. 'POST:' . print_r($_POST, 1) . "\n";
$fp = fopen('post-log.txt', 'a');
fwrite($fp, $log);
fclose($fp);
// Result object
$r = new stdClass();
// Result content type
header('content-type: application/json');
$data = $_POST['thumbnail'];
unset($_POST['thumbnail']);
if($data){
// Uploading folder
$folder = '../'. '../'. 'data/'. 'photos/'. $_SESSION['user_id'] . '/';
if (!is_dir($folder))
mkdir($folder);
// If specifics folder
$folder .= $_POST['folder'] ? $_POST['folder'] . '/' : '';
if (!is_dir($folder))
mkdir($folder);
$filename = $_POST['value'] ? $_POST['value'] :
$folder . sha1(@microtime() . '-' . $_POST['_default']) . '.jpg';
$data = split(',', $data);
file_put_contents($filename, base64_decode($data[1]));
}
die(json_encode(array_merge(array('url' => $filename), $_POST)));
?>
上传.php：
<?php
session_start()
?>
<?
// LOG
$log = '=== ' . @date('Y-m-d H:i:s') . ' ===============================' . "\n"
. 'FILES:' . print_r($_FILES, 1) . "\n"
. 'POST:' . print_r($_POST, 1) . "\n";
$fp = fopen('upload-log.txt', 'a');
fwrite($fp, $log);
fclose($fp);
// Result object
$r = new stdClass();
// Result content type
header('content-type: application/json');
// Maximum file size
$maxsize = 10; //Mb
// File size control
if ($_FILES['xfile']['size'] > ($maxsize * 1048576)) {
$r->error = "Max file size: $maxsize Kb";
}
// Uploading folder
$folder = '../'. '../'. 'data/'. 'photos/'. $_SESSION['user_id'] . '/';
if (!is_dir($folder))
mkdir($folder);
// If specifics folder
$folder .= $_POST['folder'] ? $_POST['folder'] . '/' : '';
if (!is_dir($folder))
mkdir($folder);
// PASS USER_ID HERE
$folder2 = '../'. '../'. 'data/'. 'photos/'. $_SESSION['user_id'] . '/';
if (!is_dir($folder2))
mkdir($folder2);
// New directory with 'files/USER_SESSION_ID/'
$folder = $newDir . $folder2;
// If the file is an image
if (preg_match('/image/i', $_FILES['xfile']['type'])) {
$filename = $_POST['value'] ? $_POST['value'] :
$folder . '_default.jpg';
} else {
$tld = split(',', $_FILES['xfile']['name']);
$tld = $tld[count($tld) - 1];
$filename = $_POST['value'] ? $_POST['value'] :
$folder . sha1(@microtime() . '-' . $_FILES['xfile']['name']) . $tld;
}
// Supporting image file types
$types = Array('image/png', 'image/gif', 'image/jpeg');
// File type control
if (in_array($_FILES['xfile']['type'], $types)) {
// Create an unique file name
// Uploaded file source
$source = file_get_contents($_FILES["xfile"]["tmp_name"]);
// Image resize
imageresize($source, $filename, $_POST['width'], $_POST['height'], $_POST['crop'], $_POST['quality']);
} else
// If the file is not an image
if (in_array($_FILES['xfile']['type'], $types))
move_uploaded_file($_FILES["xfile"]["tmp_name"], $filename);
// File path
$path = str_replace('upload.php', '', $_SERVER['SCRIPT_NAME']);
// Result data
$r->filename = $filename;
$r->path = $path;
$r->img = '<img src="' . $path . $filename . '" alt="image" />';
// Return to JSON
echo json_encode($r);
// Image resize function with php + gd2 lib
function imageresize($source, $destination, $width = 0, $height = 0, $crop = false, $quality = 80) {
$quality = $quality ? $quality : 80;
$image = imagecreatefromstring($source);
if ($image) {
// Get dimensions
$w = imagesx($image);
$h = imagesy($image);
if (($width && $w > $width) || ($height && $h > $height)) {
$ratio = $w / $h;
if (($ratio >= 1 || $height == 0) && $width && !$crop) {
$new_height = $width / $ratio;
$new_width = $width;
} elseif ($crop && $ratio <= ($width / $height)) {
$new_height = $width / $ratio;
$new_width = $width;
} else {
$new_width = $height * $ratio;
$new_height = $height;
}
} else {
$new_width = $w;
$new_height = $h;
}
$x_mid = $new_width * .5; //horizontal middle
$y_mid = $new_height * .5; //vertical middle
// Resample
error_log('height: ' . $new_height . ' - width: ' . $new_width);
$new = imagecreatetruecolor(round($new_width), round($new_height));
imagecopyresampled($new, $image, 0, 0, 0, 0, $new_width, $new_height, $w, $h);
// Crop
if ($crop) {
$crop = imagecreatetruecolor($width ? $width : $new_width, $height ? $height : $new_height);
imagecopyresampled($crop, $new, 0, 0, ($x_mid - ($width * .5)), 0, $width, $height, $width, $height);
//($y_mid - ($height * .5))
}
// Output
// Enable interlancing [for progressive JPEG]
imageinterlace($crop ? $crop : $new, true);
$dext = strtolower(pathinfo($destination, PATHINFO_EXTENSION));
if ($dext == '') {
$dext = $ext;
$destination .= '.' . $ext;
}
switch ($dext) {
case 'jpeg':
case 'jpg':
imagejpeg($crop ? $crop : $new, $destination, $quality);
break;
case 'png':
$pngQuality = ($quality - 100) / 11.111111;
$pngQuality = round(abs($pngQuality));
imagepng($crop ? $crop : $new, $destination, $pngQuality);
break;
case 'gif':
imagegif($crop ? $crop : $new, $destination);
break;
}
@imagedestroy($image);
@imagedestroy($new);
@imagedestroy($crop);
}
}
?>