I was curious to know if there was a way to download a file from SERVER A and put it on SERVER B where SERVER A has the ability to dynamically change what's in the downloaded file.
The point behind it is that I'm trying to build an error handler for a tool that will be used when a file that is a needed part of a tool goes missing. It would be like WordPress realizing there is a file missing on your site and your site sends a request to wordpress.com to get the missing files like this:
(SERVER B): PHP spits out error on include
(SERVER B): PHP tries to get a file installer for the missing files from SERVER A by saying SERVER B is missing FILE A, FILE B, FILE C, etc...
for the step above I was thinking it could be done using this:
file_put_contents("missing_installer.php", "http://SERVER_A.com/mi_inst_installer.php?query-asking-for-missing-item(s)=missing-item", 'r'));
NOTE (only if you don't understand what the above code does): The above code is supposed to tell SERVER A's PHP file, mi_inst_installer.php, to spit out data (the installer) and put it into file, missing_installer.php, on SERVER B
(SERVER B): PHP installs missing files using the newly obtained missing_installer.php
Any ideas on what to do?
You can also use cURL for dynamics on SERVER A's Side:
function curl($url){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
$return = curl_exec($ch);
curl_close ($ch);
return $return;
}
file_put_contents('missing_installer.php', curl('http://SERVER_A.com/mi_inst_installer.php?query-asking-for-missing-item(s)=missin-item'));
Jacky's answer is good only if allow_url_fopen is set to 1.
also use PHP's reference for cURL transfer options (lets you customize how the the request is sent and/or returned). Also, it's a good idea to get used to how cURL works generally; see the other PHP reference (client URL library)
try something like this:
$mycontent = file_get_contents('http://SERVER_A.com/mi_inst_installer.php?query-asking-for-missing-item(s)=missin-item');
file_put_contents('missing_installer.php', $mycontent));
you need to get (using file_get_contents()) the contents of the downloaded file first and then put it into the second parameter of file_put_contents() first.
Related
I am using file_get_contents in PHP to get information from a client's collections on contentDM. CDM has an API so you can get that info by making php queries, like, say:
http://servername:port/webutilities/index.php?q=function/arguments
It has worked pretty well thus far, across computers and operating systems. However, this time things work a little differently.
http://servername/utils/collection/mycollectionname/id/myid/filename/myname
For this query I fill in mycollection, myid, and myname with relevant values. myid and mycollection have to exist in the system, obviously. However, myname can be anything you want. When you run the query, it doesn't return a web page or anything to your browser. It just automatically downloads a file with myname as the name of the file, and puts it in your local /Downloads folder.
I DON'T WISH TO DOWNLOAD THIS FILE. I just want to read the contents of the file it returns directly into PHP as a string. The file I am trying to get just contains xml data.
file_get_contents works to get the data in that file, if I use it with PHP7 and Apache on my laptop running Ubuntu. But, on my desktop which runs Windows 10, and XAMPP (Apache and PHP5), I get this error (I've replaced sensitive data with ###):
Warning:
file_get_contents(###/utils/collection/###/id/1110/filename/1111.cpd):
failed to open stream: No such file or directory in
D:\Titus\Documents\GitHub\NativeAmericanSCArchive\NASCA-site\api\update.php
on line 18
My coworkers have been unable to help me so I am curious if anyone here can confirm or deny whether this is an operating system issue, or a PHP version issue, and whether there's a solid alternative method that is likely to work in PHP5 and on both Windows and Ubuntu.
file_get_contents() is a simple screwdriver. It's very good for getting data by simply GET requests where the header, HTTP request method, timeout, cookiejar, redirects, and other important things do not matter.
fopen() with a stream context or cURL with setopt are powerdrills with every bit and option you can think of.
In addition to this, due to some recent website hacks, we had to secure our sites more. In doing so, we discovered that file_get_contents failed to work, where curl still would work.
Not 100%, but I believe that this php.ini setting may have been blocking the file_get_contents request.
; Disable allow_url_fopen for security reasons
allow_url_fopen = 0
Either way, our code now works with curl.
reference :
http://25labs.com/alternative-for-file_get_contents-using-curl/
http://phpsec.org/projects/phpsecinfo/tests/allow_url_fopen.html
So, You can solve this problem by using PHP cURL extension. Here is an example that does the same thing you were trying:
function curl($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
$url = 'your_api_url';
$data = curl($url);
And finally you can check your data by print_r($data). Hope it you it will works and you will understand.
Reference : http://php.net/manual/en/book.curl.php
I've tried looking for a solution to this issue for a few days now and am getting quite confused.
Aim:
To have a PHP server ("Server A") communicate directly to another PHP
server ("Server B") when Server A is visited by user. It then sends a
query string to Server B to add in to Server B's database.
Full story:
A visitor will visit Server A and register to their website, as part
of their registration Server A will write to Server A's database with
all the visitors information. At this point I'd like Server A to load
a .php file on Server B and send a query string with it, for example:
http://example.com/api/add.php?name=Craig&age=21&key=32r932r9832yr813hr813rh1389ry13r7y31r.
Server B, having a PHP file requested from it, will take the variables
and run the script on add.php (take the variables and add it to it's
database).
Important note: I don't want the client machine to know this, initially I wanted to use JQUERY but realised this sends the request from the client machine and not the server directly.
What is the best way to do this?
Many thanks in advance!
Craig
Learn cURL. Here is an example to get you started:
<?php
$ch = curl_init('http://example.com/api/add.php?name=Craig&age=21&key=32r932r9832yr813hr813rh1389ry13r7y31r');
curl_setopt($ch, CURLOPT_HEADER, 0);
$response = curl_exec($ch);
curl_close($ch);
?>
According to the description of the Google Custom Search API you can invoke it using the GET verb of the REST interface, like with the example:
GET https://www.googleapis.com/customsearch/v1?key=INSERT-YOUR-KEY&cx=017576662512468239146:omuauf_lfve&q=lectures
I setup my API key and custom search engine, and when pasted my test query directly on my browser it worked fine, and I got the JSON file displayed to me.
Then I tried to invoke the API from my PHP code by using:
$json = file_get_contents("$url") or die("failed");
Where $url was the same one that worked on the browser, but my PHP code was dying when trying to open it.
After that I tried with curl, and it worked. The code was this:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$body = curl_exec($ch);
Questions:
How come file_get_contents() didn't work and curl did?
Could I use fsocket for this as well?
Question 1:
At first you should check ini setting allow_url_fopen, AFAIK this is the only reason why file_get_contents() shouldn't work. Also deprecated safe_mode may cause this.
Oh, based on your comment, you have to add http:// to URL when using with file system functions, it's a wrapper that tells php that you need to use http request, without it function thinks you require to open ./google.com (the same as google.txt).
Question 2:
Yes, you can build almost any cURL request with sockets.
My personal opinion is that you should stick with cURL because:
timeout settings
handles all possible HTTP states
easy and detailed configuration (there is no need for detailed knowledge of HTTP headers)
file_get_contents probably will rewrite your request after getting the IP, obtaining the same thing as:
file_get_contents("xxx.yyy.www.zzz/app1",...)
Many servers will deny you access if you go through IP addressing in the request.
With cURL this problem doesn't exists. It resolves the hostname leaving the request as you set it, so the server is not rude in response.
This could be the "cause", too..
1) Why are you using the quotes when calling file_get_contents?
2) As it was mentioned in the comment, file_get_contents requires allow_url_fopen to be enabled on your php.ini.
3) You could use fsockopen, but you would have to handle HTTP requests/responses manually, which would be to reinvent the wheel when you have cURL. The same goes for socket_create.
4) Regarding the title of this question: cURL can be more customizable and useful to work with complex HTTP transactions than file_get_contents. Though, it should be mentioned, that working with stream contexts allows you to make a lot of settings for your file_get_contents calls. However, I think cURL is still more complete since it gives you, for instance, the possibility of working with multiple parallel handlers.
I am trying to pass some information of a server in which the script is running to next url or server.
I tried using curl. I have following two disadvantages:
if cannot locate file it will tell file not found
it waits till the remote file execution is completed.
How can I overcome both of the things either by using curl or other commands?
Edit:
Now I would like to suppress the file not found message error message being displayed by curl even if the file really doesn't exists.
I do not want output from destination page so I don't want to wait till the execution of the destination page is finished. I just want to trigger the code and continue with another scripts remaining
Example:
I am trying to build a log system which will have its everything in next webserver. The client website which implements the log system will be sending some of the data required for the system by calling a file in my webserver.
Code I am using:
// create a new cURL resource
$ch = curl_init();
// set URL and other appropriate options
curl_setopt($ch, CURLOPT_URL, "http://example.com/log.php?data=data");
curl_setopt($ch, CURLOPT_HEADER, 0);
// grab URL and pass it to the browser
curl_exec($ch);
// close cURL resource, and free up system resources
curl_close($ch);
Why don't you want to use standard PHP features?
<?php
$logpage = file_get_contents('http://example.com/log.php?data=data');
echo $logpage;
?>
We are using shared hosting and the follow features are disabled.
file_uploads = Off
allow_url_fopen = Off
allow_url_include = Off
We are unable to change hosting and need to figure out some workarounds. The hosting co is also not able/willing to enable these features.
For example:
We are calling 1 server from another in order to get content. So we do an include but since URL file include is disabled we are not sure what options we have to get the content on that second server and store it there using some kind of cache.
We control the content server fully (dedicated) so we can do whatever necessary just not sure if there is some easy solution to the problem.
Since you're looking to retrieve remote content the easiest way will be to write the functionality to fetch the content yourself with something like curl (php.net/curl)
Have you tried something like this:
http://www.humanumbrella.com/2007/12/08/how-to-download-a-remote-file-in-php-and-then-save-it/
It depends on how locked down the server is. The given examples (using curl functions or fsockopen) should not be hampered by the restrictions you mentioned.
You can solve your problem like this
a) Create mechanism in dedicated server to fetch any file (plus some kind of key based authentication and restrictions on paths where files can be fetched from)
eg: A url that says get_file?path=/path/to/file&key=security_key
b) Write a function to fetch this as if from a local file
function fetch_file($path) {
$ch = curl_init("http://www.example.com/get_file?path=$path&key=security_key");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
$output = curl_exec($ch);
curl_close($ch);
return $output;
}
Then you can eval the returned string and that would be like including the file
eval fetch_file($path);
Another solution to write to the server if php file upload is prevented is to ftp the file on to your server and include the file.