鏈接家長記錄與兒童圖像文件

Question

我想知道是否有人可以幫助我請。

我創建了this表單，它允許用戶記錄他們訪問的特定位置的詳細信息，並且每個位置都保存着一個唯一的增量'locationid'作爲mySQL記錄的一部分保存。

我已經進一步擴展了這一點，當他們點擊添加'添加圖像'按鈕時，他們將能夠保存連接到創建'位置'記錄的圖像文件。這是通過下面的代碼完成的，它將原始圖像文件和縮略圖版本保存到我的服務器上的文件夾中。

<?php 
//define a maxim size for the uploaded images 
//define ("MAX_SIZE","100"); 
// define the width and height for the thumbnail 
// note that theese dimmensions are considered the maximum dimmension and are not fixed, 
// because we have to keep the image ratio intact or it will be deformed 
define ("WIDTH","150"); 
define ("HEIGHT","100"); 

// this is the function that will create the thumbnail image from the uploaded image 
// the resize will be done considering the width and height defined, but without deforming the image 
function make_thumb($img_name,$filename,$new_w,$new_h) 
{ 
//get image extension. 
$ext=getExtension($img_name); 
//creates the new image using the appropriate function from gd library 
if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext)) 
$src_img=imagecreatefromjpeg($img_name); 

if(!strcmp("png",$ext)) 
$src_img=imagecreatefrompng($img_name); 

//gets the dimmensions of the image 
$old_x=imageSX($src_img); 
$old_y=imageSY($src_img); 

// next we will calculate the new dimmensions for the thumbnail image 
// the next steps will be taken: 
// 1. calculate the ratio by dividing the old dimmensions with the new ones 
// 2. if the ratio for the width is higher, the width will remain the one define in WIDTH variable 
// and the height will be calculated so the image ratio will not change 
// 3. otherwise we will use the height ratio for the image 
// as a result, only one of the dimmensions will be from the fixed ones 
$ratio1=$old_x/$new_w; 
$ratio2=$old_y/$new_h; 
if($ratio1>$ratio2) { 
$thumb_w=$new_w; 
$thumb_h=$old_y/$ratio1; 
} 
else { 
$thumb_h=$new_h; 
$thumb_w=$old_x/$ratio2; 
} 

// we create a new image with the new dimmensions 
$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h); 

// resize the big image to the new created one 
imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 

// output the created image to the file. Now we will have the thumbnail into the file named by $filename 
if(!strcmp("png",$ext)) 
imagepng($dst_img,$filename); 
else 
imagejpeg($dst_img,$filename); 

//destroys source and destination images. 
imagedestroy($dst_img); 
imagedestroy($src_img); 
} 

// This function reads the extension of the file. 
// It is used to determine if the file is an image by checking the extension. 
function getExtension($str) { 
$i = strrpos($str,"."); 
if (!$i) { return ""; } 
$l = strlen($str) - $i; 
$ext = substr($str,$i+1,$l); 
return $ext; 
} 

// This variable is used as a flag. The value is initialized with 0 (meaning no error found) 
//and it will be changed to 1 if an error occurs. If the error occures the file will not be uploaded. 
$errors=0; 
// checks if the form has been submitted 
if(isset($_POST['Submit'])) 
{ 

$title = ($_POST['title']); 

if ($title == '') // if title is not set 
$title = '(No Title Provided)';// use (empty title) string 

//reads the name of the file the user submitted for uploading 
$image=$_FILES['image']['name']; 
// if it is not empty 
if ($image == '') 
{ 
echo '<b> Error! </b> - You <b> must </b> select a file to upload before selecting the <b> "Upload image" </b> button. Please try again.'; 
$errors=1; 
} 
else 
if ($image) 
{ 
// get the original name of the file from the clients machine 
$filename = stripslashes($_FILES['image']['name']); 

// get the extension of the file in a lower case format 
$extension = getExtension($filename); 
$extension = strtolower($extension); 
// if it is not a known extension, we will suppose it is an error, print an error message 
//and will not upload the file, otherwise we continue 
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png")) 
{ 
echo '<b> Error! </b> - The image that you attempted to upload is not in the correct format. The file format <b> must </b> be one of the following: <b> "jpg", "jpeg" </b> or <b> "png" </b>. Please try again.'; 
$errors=1; 
} 
else 
{ 
// get the size of the image in bytes 
// $_FILES[\'image\'][\'tmp_name\'] is the temporary filename of the file in which the uploaded file was stored on the server 
$size=getimagesize($_FILES['image']['tmp_name']); 
$sizekb=filesize($_FILES['image']['tmp_name']); 

//compare the size with the maxim size we defined and print error if bigger 
if ($sizekb > 1150000) 
{ 
echo '<b> Error! </b> - The file that you are attempting to upload is greater than the prescribed <b> 1MB </b> limit. Please try again.'; 
$errors=1; 
} 

//we will give an unique name, for example the time in unix time format 
$image_name=$title.'.'.$extension; 
//the new name will be containing the full path where will be stored (images folder) 
$newname="images/".$image_name; 
$copied = copy($_FILES['image']['tmp_name'], $newname); 
//we verify if the image has been uploaded, and print error instead 
if (!$copied) 
{ 
echo '<b> Error! </b> Your file has not been loaded'; 
$errors=1; 
} 
else 
{ 
// the new thumbnail image will be placed in images/thumbs/ folder 
$thumb_name='images/thumbs/'.$image_name; 
// call the function that will create the thumbnail. The function will get as parameters 
//the image name, the thumbnail name and the width and height desired for the thumbnail 
$thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT); 
}} }} 

//If no errors registred, print the success message and show the thumbnail image created 
if(isset($_POST['Submit']) && !$errors) 
{ 
echo '<br><b> Success! </b> - Your image has been uploaded</br>'; 
echo '<img src="'.$thumb_name.'">'; 
} 

?> 
<!-- next comes the form, you must set the enctype to "multipart/form-data" and use an input type "file" --> 

<form name="newad" method="post" enctype="multipart/form-data" action=""> 
<table> 
<tr><td><input type="text" name="title" ></td></tr> 
<tr><td><input type="file" name="image" ></td></tr> 
<tr><td><input name="Submit" type="submit" value="Upload image"></td></tr> 
</table> 
</form> 

我遇到的問題是，我無法找到鏈接「位置（父）」記錄和「圖片（孩子）」記錄的方式。由於圖片上傳是父記錄創建的一部分，因此尚未創建唯一的'locationid'字段。

我只是想知道是否有人，也許有更多的經驗，我可以建議一種方法來克服這個問題？

許多的感謝和親切的問候

Answer 1

1. 然後上傳圖片，保存它是在服務器路徑一些存儲（例如PHP會議）
2. 當保存您的位置，從會話鏈接的圖像與生成場所和將它們從會話中刪除（但不是從服務器存儲中刪除）
3. 如果操作被取消 - 從會話和服務器存儲中刪除保存的圖像。
4. 如果用戶僅在關閉瀏覽器而不按任何「取消」按鈕的情況下，您還需要一些垃圾回收。