[英]Changing a Image source file using php
我基本上想简单上传图片,然后将第一张图片更改为新上传的照片
邮递区号:(为您的协助加注)
<?php
//define a maxim size for the uploaded images in Kb
define ("MAX_SIZE","100");
//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 errror occures.
//If the error occures the file will not be uploaded.
$errors=0;
//checks if the form has been submitted
if(isset($_POST['Submit']))
{
//reads the name of the file the user submitted for uploading
$image=$_FILES['image']['name'];
//if it is not empty
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 and will not upload the file,
//otherwise we will do more tests
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif"))
{
//print error message
echo "";
$errors=1;
}
else
{
//get the size of the image in bytes
//$_FILES['image']['tmp_name'] is the temporary filename of the file
//in which the uploaded file was stored on the server
$size=filesize($_FILES['image']['tmp_name']);
//compare the size with the maxim size we defined and print error if bigger
if ($size > MAX_SIZE*1024)
{
echo "";
$errors=1;
}
//we will give an unique name, for example the time in unix time format
$image_name=time().'.'.$extension;
//the new name will be containing the full path where will be stored (images folder)
$newname="images/".$image_name;
//we verify if the image has been uploaded, and print error instead
$copied = copy($_FILES['image']['tmp_name'], $newname);
if (!$copied)
{
echo "";
$errors=1;
}}}}
//If no errors registred, print the success message
if(isset($_POST['Submit']) && !$errors)
{
echo "";
}
?>
-照片部
<div id="photo1div">
<img id="photo1" src="" alt="No Image" width="251" height="146" />
</div>
-按钮(上传和浏览)
<form name="newad" method="post" enctype="multipart/form-data" action="">
<table>
<tr><td><table>
<tr>
<td><input type="file" name="image" /></td>
</tr>
<tr>
<td><input name="Submit" id="upload" type="submit" value="Upload image" onclick"load_images()" /></td>
</tr>
</table></td></tr>
</table>
</form>
-如果您有更好的方法(例如jquery或ajax),请务必告诉我如何
PHP和所有文件都在同一个文件中(.php分机)。
因此,请查看:
当我单击“浏览”并选择一个图像时,它将保存到一个名为“ image” /的目录文件夹中,然后当我单击“提交”时,我希望它将“图像源”(photo1)更改为刚刚上传的图像。
我有什么办法可以做到这一点?
谢谢-朱利安
这是我的解决方案
在页面中,您具有表单元素:-
<form id="imageUploadForm" action="storeImage.php" method="POST" enctype="multipart/form-data">
<input type="file"name="imgFile" >
<input type="submit value="Upload">
</form>
在storeImage.php
执行以下操作
if($_SERVER["REQUEST_METHOD"]=="POST"&&isset($_REQUEST["imgFile"]))
{
$name=$_FILES["imgFile"]["name"];
$tempName=$_FILES["imgFile"]["tmp_name"]; // temporary location
$size=$_FILES["imgFile"]["size"];
$type=$_FILES["imgFile"]["type"];
if(($type=="image/jpg"||$type=="image/jpeg"||$type=="image/png")&&($size>0&&$size<=4096000))
{
$dir="thisImageFolder"; //folder name in your current directory where the file will be stored
$fullDirectory=$dir;
$realPath=$dir."/".$name;
if(is_dir($fullDirectory)) //if directory exists then move the file to this plae
{
move_uploaded_file($tempName, $realPath);
}
else //else make the directory and the move the file to this place
{
mkdir($fullDirectory,0777,true);
move_uploaded_file($tempName, $realPath);
}
header("Location:backToMyPage.php"); //takes the user back to this page.
}
else
{
print "File not of an image type or has exceeded size limit";
}
}
返回页面后,只需使用图像的相对路径即可加载该图像。
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