php 使用php代码从URL下载图像？
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Download image from URL using php code?
提问by Sarah
How can I use php to download an image from URL (eg: https://www.google.com/images/srpr/logo3w.png) then save it? This is what I came up with so far, it gives me an error in 'file_put_contents' function.
如何使用 php 从 URL 下载图像（例如：https://www.google.com/images/srpr/logo3w.png）然后保存它？到目前为止，这是我想出的，它给了我'file_put_contents'函数的错误。
<form method="post" action="">
<textarea name="text" cols="60" rows="10">
</textarea><br/>
<input type="submit" class="button" value="submit" />
</form>
<?php
$img = "no image";
if (isset($_POST['text']))
{
$content = file_get_contents($_POST['text']);
$img_path = '/images/';
file_put_contents($img_path, $content);
$img = "<img src=\"".$img_path."\"/>";
}
echo $img;
?>
It gives me the error:
它给了我错误：
[function.file-put-contents]: failed to open stream: No such file or directory in C:\wamp\www\img.php
[function.file-put-contents]: failed to open stream: No such file or directory in C:\wamp\www\img.php
The /images/directory is located in the same directory of the php file and is writable.
该/images/目录位于php文件的同一目录下，是可写的。
回答by Jon
You cannot save the image with your existing code because you do not provide a file name. You need to do something like:
您无法使用现有代码保存图像，因为您没有提供文件名。您需要执行以下操作：
$filenameIn = $_POST['text'];
$filenameOut = __DIR__ . '/images/' . basename($_POST['text']);
$contentOrFalseOnFailure = file_get_contents($filenameIn);
$byteCountOrFalseOnFailure = file_put_contents($filenameOut, $contentOrFalseOnFailure);
回答by NeeL
What is your error ? But you have the right way to do what you want to do.
你的错误是什么？但是你有正确的方法去做你想做的事。
Just take care in your code, I can see file_put_contents($img_path,but $img_pathis a path to a folder.
You need to write something like :
请注意您的代码，我可以看到file_put_contents($img_path,但它$img_path是文件夹的路径。你需要写一些类似的东西：
example
例子
$img_path="home/downloads/my_images";
file_put_contents($img_path."/flower.jpg");
回答by Rohit Vipin Mathews
file_put_contents($img_path, $content);
To what are you putting to?? i think you have made a mistake with getand put. or missed to specify the full path including the file name and extension
你要干什么？？我认为你在get和 上犯了一个错误put。或错过指定完整路径，包括文件名和扩展名
回答by Janith Chinthana
I added one condition to accepted answer to check the image type as follows,
我在接受的答案中添加了一个条件来检查图像类型，如下所示，
if (exif_imagetype($_POST['text']) == IMAGETYPE_PNG) {
$filename = './images/'.basename($_POST['text']);
file_put_contents($filename, $content);
}
from above example I show how to check png images before download the files and for more content types you can find here.
从上面的示例中，我展示了如何在下载文件之前检查 png 图像以及更多内容类型，您可以在此处找到。
回答by heyanshukla
file_put_contents()requires first parameter to be file name not the path.
file_put_contents()要求第一个参数是文件名而不是路径。
