Php 上传后显示图像
有简单的形式上传图像，我想在上传后显示图像。一切正常，文件也上传，但照片不显示。请帮助。 表格：Php 上传后显示图像,php,Php,有简单的形式上传图像，我想在上传后显示图像。一切正常，文件也上传，但照片不显示。请帮助。 表格： 和php： <?php //define a maxim size for the uploaded images in Kb define ("MAX_SIZE","5060"); //This function reads the extension of the file. It is used to determine if the file i
<?php
//define a maxim size for the uploaded images in Kb
define ("MAX_SIZE","5060");
//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 errro 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 '<h2>Unknown extension!</h2>';
$errors=1;
}
else
{
//get the size of the image in bytes
//$_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 '<h2>You have exceeded the file size limit! Please reduce the image size to 100 Kb or less!</h2>';
$errors=1;
}
//we will give an unique name, for example the time in unix time format
$image_name=$filename;
//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 '<h2>Copy unsuccessful!</h2>';
$errors=1;
}
}
}
}
//If no errors registred, print the success message
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
?>
错误消息会准确地告诉您问题所在。您不能像这样混合使用HTML和PHP：
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
if(isset($_POST['Submit']) && !$errors)
{
echo "<img src=\"http://localhost/images/$image_name\" alt=\"There ya go\" />";
}
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
if(isset($_POST['Submit']) && !$errors)
{
echo "<img src=\"http://localhost/images/$image_name\" alt=\"There ya go\" />";
}
if（设置（$\u POST['Submit']）&&&！$errors）
{
“alt=”好了“/>
}
该标记需要包装在字符串文字中，并像任何其他标记一样进行回显。如下所示：
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
if(isset($_POST['Submit']) && !$errors)
{
echo "<img src=\"http://localhost/images/$image_name\" alt=\"There ya go\" />";
}
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
if(isset($_POST['Submit']) && !$errors)
{
echo "<img src=\"http://localhost/images/$image_name\" alt=\"There ya go\" />";
}
if（设置（$\u POST['Submit']）&&&！$errors）
{
回声“；
}
或者，如果您愿意，可以这样做：
if(isset($_POST['Submit']) && !$errors)
{
echo '<img src="http://localhost/images/' . $image_name . '" alt="There ya go" />';
}
if(isset($_POST['Submit']) && !$errors)
{
echo '<img src="http://localhost/images/' . $image_name . '" alt="There ya go" />';
}
if（设置（$\u POST['Submit']）&&&！$errors）
{
回声'；
}
这就是您的问题所在：
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
if（设置（$\u POST['Submit']）&&&！$errors）
{
“alt=”好了“/>
}
问题是，您在PHP代码中使用的是HTML语法。关闭PHP，添加HTML代码，然后重新打开PHP：
if(isset($_POST['Submit']) && !$errors)
{
?>
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
<?php
}
if（设置（$\u POST['Submit']）&&&！$errors）
{
?>
“alt=”好了“/>
if（设置（$\u POST['Submit']）&&&！$errors）
{
“alt=”好了“/>
}
该标记需要包装在字符串文字中，并像任何其他标记一样进行回显。如下所示：
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
if(isset($_POST['Submit']) && !$errors)
{
echo "<img src=\"http://localhost/images/$image_name\" alt=\"There ya go\" />";
}
if(isset($_POST['Submit']) && !$errors)
{
<img src="http://localhost/images/<?php echo $image_name; ?>" alt="There ya go" />
}
if(isset($_POST['Submit']) && !$errors)
{
echo "<img src=\"http://localhost/images/$image_name\" alt=\"There ya go\" />";
}
if（设置（$\u POST['Submit']）&&&！$errors）
{
回声“；
}
或者，如果您愿意，可以这样做：
if(isset($_POST['Submit']) && !$errors)
{
echo '<img src="http://localhost/images/' . $image_name . '" alt="There ya go" />';
}
if(isset($_POST['Submit']) && !$errors)
{
echo '<img src="http://localhost/images/' . $image_name . '" alt="There ya go" />';
}
if（设置（$\u POST['Submit']）&&&！$errors）
{
回声'；
}
问题是，您在php中使用的是html标记，它主要在if条件下不起作用
试试这个：
echo '<img src="http://localhost/images/' . $image_name . '" alt="There ya go" />';
echo'；
你也可以在这里参考：
if(file_exists($file)){
echo $file."</br>";
echo "<img src="<?php echo file_dir . '/' . $imageone; ?>" height="100" width="100"/>" ;
}
if（文件存在（$file））{
echo$文件“”；
回声“height=“100”width=“100”/>”；
}
在这种情况下，$file
将是文件的目标路径，您可以应用与相同的函数
在您的脚本中。使用一个开头echo=>“alt=”There ya go“/>并删除echo和php标记。第一个错误我看到localhost/images/“alt=”There ya go“/>您忘记使用echo并向所有帮助过的人引用stringThankx。我得到了解决方案。再次感谢。第二种方法是最好的。谢谢。