我正在开发一个网站，用户可以将多个图像上传到服务器/网站，在我的上传脚本中，我将图像大小限制为10MB。这是因为我认为很多现代相机会拍摄大量图像。
上传脚本每次拍摄一张图像，并调整为3个不同版本，900x600,600x450和较小的缩略图，并在2张较大图像的顶部放置水印图像。
我将php.ini memory_limit设置为96MB，我认为这很容易。
经过一些测试后，我上传的是jpg图像，大小为6.38MB，分辨率为6143 x 3855像素。我收到错误消息“致命错误：允许的内存大小为100663296字节耗尽（试图分配24572字节）”
你觉得上传和处理这么大的图像需要这么多内存是否合理？或者你认为我的剧本编码更可能是一个问题吗？
96 MB内存限制对我来说似乎很重要。处理大型图片上传的其他人有哪些经验？我应该将内存限制设置为128MB或更高？或者我应该重新编写上传脚本？
我的代码添加如下：
//If a new image has been added, resize and upload to filesystem
if ($_FILES['new_image']['name'] !=''){
$allowed_types=array(
'image/gif' => '.gif',
'image/jpeg' => '.jpg',
'image/png' => '.png',
'image/x-png' => '.png',
'image/pjpeg' => '.jpg'
);
$img = $_FILES['new_image'];
// Check the file to be uploaded is the correct file type and is under 9MB
if ((array_key_exists($img['type'], $allowed_types)) && ($img['size'] < 9000000)) {
// File to be uploaded is Valid
// File to be uploaded is Valid
$imagename = stripslashes($_FILES['new_image']['name']);
// make the random file name
$randName = md5(rand() * time());
$ext = pathinfo($imagename, PATHINFO_EXTENSION);
$imagename = $randName . "." . $ext;
$source = $_FILES['new_image']['tmp_name'];
// Check if Directory Exists, if not create it
if(!file_exists("images/breeds/".$trimmed['profile_id']))
{
mkdir("images/breeds/".$trimmed['profile_id']) or die("Could not create images folder for article ".$trimmed['profile_id']);
}
// Check if thumbnail Directory Exists
if(!file_exists("images/breeds/".$trimmed['profile_id']."/thumbs"))
{
mkdir("images/breeds/".$trimmed['profile_id']."/thumbs") or die("Could not create thumbnail folder for article ".$trimmed['profile_id']);
}
// Check if thumbnail Directory Exists
if(!file_exists("images/breeds/".$trimmed['profile_id']."/large"))
{
mkdir("images/breeds/".$trimmed['profile_id']."/large") or die("Could not create thumbnail folder for article ".$trimmed['profile_id']);
}
$LargeImage = "images/breeds/".$trimmed['profile_id']."/large/".$imagename;
$NormalImage = "images/breeds/".$trimmed['profile_id']."/".$imagename;
$SmallImage = "images/breeds/".$trimmed['profile_id']."/thumbs/".$imagename;
//uploaded temp file
$file = $_FILES['new_image']['tmp_name'];
//Get Image size info
list($width, $height, $image_type) = getimagesize($file);
//SourceImage
switch ($image_type)
{
case 1: $image = imagecreatefromgif($file); break;
case 2: $image = imagecreatefromjpeg($file); break;
case 3: $image = imagecreatefrompng($file); break;
default: trigger_error('Unsupported filetype!', E_USER_WARNING); break;
}
// Constraints for Large Image
$max_width = 900;
$max_height = 600;
$ratioh = $max_height/$height;
$ratiow = $max_width/$width;
$ratio = min($ratioh, $ratiow);
if (($height < $max_height) && ($width < $max_width)) {
//keep same dimensions
$modwidth = $width;
$modheight = $height;
} else {
// New dimensions
$modwidth = intval($ratio*$width);
$modheight = intval($ratio*$height);
}
$tmpLarge = imagecreatetruecolor( $modwidth, $modheight );
imagecopyresampled($tmpLarge, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;
// Add Watermark to large image at top right
$wm = "images/p4h-wm-200.png";
$wmImage = imagecreatefrompng($wm);
$wmW = imagesx($wmImage);
$wmH = imagesy($wmImage);
$photoW = imagesx($tmpLarge);
$photoH = imagesy($tmpLarge);
$dest_x = $photoW - $wmW - 10;
$dest_y = 10;
// imagecopymerge($tn, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH, 100);
imagecopy($tmpLarge, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH);
switch ($image_type)
{
case 1: imagegif($tmpLarge,$LargeImage); break;
case 2: imagejpeg($tmpLarge,$LargeImage, 80); break;
case 3: imagepng($tmpLarge,$LargeImage, 0); break;
default: trigger_error('Failed resize image!', E_USER_WARNING); break;
}
// Destroy tmp images to free memory
imagedestroy($tmpLarge);
imagedestroy($wmImage);
// Constraints for Normal Image
$max_width = 550;
$max_height = 413;
$ratioh = $max_height/$height;
$ratiow = $max_width/$width;
$ratio = min($ratioh, $ratiow);
if (($height < $max_height) && ($width < $max_width)) {
//keep same dimensions
$modwidth = $width;
$modheight = $height;
} else {
// New dimensions
$modwidth = intval($ratio*$width);
$modheight = intval($ratio*$height);
}
$tmpNormal = imagecreatetruecolor( $modwidth, $modheight );
imagecopyresampled($tmpNormal, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;
// Add Watermark to large image at top right
$wm = "images/p4h-wm-150.png";
$wmImage = imagecreatefrompng($wm);
$wmW = imagesx($wmImage);
$wmH = imagesy($wmImage);
$photoW = imagesx($tmpNormal);
$photoH = imagesy($tmpNormal);
$dest_x = $photoW - $wmW - 10;
$dest_y = 10;
// imagecopymerge($tn, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH, 100);
imagecopy($tmpNormal, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH);
switch ($image_type)
{
case 1: imagegif($tmpNormal,$NormalImage); break;
case 2: imagejpeg($tmpNormal,$NormalImage, 90); break;
case 3: imagepng($tmpNormal,$NormalImage, 0); break;
default: trigger_error('Failed resize image!', E_USER_WARNING); break;
}
// Destroy tmp images to free memory
imagedestroy($tmpNormal);
imagedestroy($wmImage);
// Now that the full size image has been saved, resize the thumbnail one to a fixed size for homepage display
// Constraints
$thumb_width = 150;
$thumb_height = 112.5;
// Calculate stuff and resize image accordingly
$src_ratio = $width/$height;
$dst_ratio = $thumb_width/$thumb_height;
if($src_ratio < $dst_ratio) // trim top and bottom
{
$ratio = $width/$thumb_width;
$crop_height = $thumb_height*$ratio;
$src_y = round(($height-$crop_height)/2);
$crop_width = $width;
$src_x = 0;
}
else // trim left and right
{
$ratio = $height/$thumb_height;
$crop_width = $thumb_width*$ratio;
$src_x = round(($width-$crop_width)/2);
$crop_height = $height;
$src_y = 0;
}
$tmpSmall = imagecreatetruecolor( $thumb_width, $thumb_height );
imagecopyresampled($tmpSmall, $image, 0, 0, $src_x, $src_y, $thumb_width, $thumb_height, $crop_width, $crop_height);
switch ($image_type)
{
case 1: imagegif($tmpSmall,$SmallImage); break;
case 2: imagejpeg($tmpSmall,$SmallImage, 90); break;
case 3: imagepng($tmpSmall,$SmallImage, 0); break;
default: trigger_error('Failed resize image!', E_USER_WARNING); break;
}
// Destroy images to free memory
imagedestroy($image);
imagedestroy($tmpSmall);
答案 0 :(得分：0)
jpg是6.38MB，但是要转换图像，使用的内部表示是未压缩的原始表示。
您的图片是23.6百万像素
它的未压缩表示可能是每像素32位（4Bytes），即：4 * 23.6MBytes = 94 MBytes。
所以，我想说，你需要有这么大的图像来处理吗？
如果是，请将memory_limit放高 如果不是，请将可上载的图像大小限制为更合理的内容设置。
答案 1 :(得分：0)
您可能需要在释放内存时向PHP提供更多提示。一个简单的$some_variable = null;通常就足够了。
完成图像（主图像及其每个缩略图）后，将引用变量设置为null以帮助释放内存。
否则，请尝试在脚本顶部和脚本中的各个位置打印或记录memory_get_usage()（http://www.php.net/manual/en/function.memory-get-usage.php）的结果，以追踪内存陷入困境的位置。
答案 2 :(得分：0)
对于原始像素数据（每像素3个字节），6143x3855图像将需要至少 71,043,795字节的内存。然后你创建了一系列其他图像来保存原始版本的大小调整等......
难怪你的内存不足。