Get HTTP response code in server side

Try $_SERVER['REDIRECT_STATUS']

$_SERVER['REDIRECT_STATUS'] seems always 200 there.

might be better to use custom error documents with .htaccess

ErrorDocument 400 /errors/badrequest.html
ErrorDocument 401 /errors/authreqd.html
ErrorDocument 403 /errors/forbid.html
ErrorDocument 404 /errors/notfound.html
ErrorDocument 500 /errors/serverr.html

Instead of html files you could use php files. Have the php files store or email the info you are wanting to capture then display a response to the user.

Could you give more details and an example ?

Here you go. I did this on a 404

404.php

<?php

print "Sorry the file you were looking for does not exist.<br>\n";

// Now we can capture info
$visitor_ip = $_SERVER['REMOTE_ADDR'];

// Get browser
$browser = $_SERVER['HTTP_USER_AGENT'];

// Send an email to admin
$subj = "404 on my domain";
$msg = "A 404 error has on my site<br>
Visitor: $visitor_ip<br>
Browser: $browser<br>";

mail("robert@**********.com",$subj,$msg);
?>

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.htaccess

ErrorDocument 404 /404.php

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Log File sending email:
root@mx [/home/*****/www]# tail -f /var/log/exim_mainlog | grep robert
2013-06-04 16:47:59 1Ujy99-002IIz-1J <= rsaylor@mx.*******.com U=rsaylor P=local S=595 T="404 on my domain" for robert@*******.com
2013-06-04 16:47:59 1Ujy99-002IIz-1J => robert <robert@*******.com> R=virtual_user T=virtual_userdelivery

Note: For this test I did not pass email headers but you would want to define headers. If you need some I can post a good working set later.

Sorry forgot: then goto http://www.yourdomain.com/fakefile.html and a 404 should be generated. You can do this on all except actual response codes that would return a proper file. IE: 200 you would not want to use the error handling but if your file is displayed then it got a 200 and you could put code in to track your visitors.

Why do you want to do this?  What's the big-picture issue?  It is a very, very rare pursuit!  If you can tell us the business logic issues, we might be able to help with a solution.

I have a API application.
When users call/use the API, sometimes something goes wrong, and we can figure out where/why.
So I want to log the API call.
I want to log:
user request
our response
response code
.....

Usually the client/user application gets the response and also can get the response code.
I want to get this response code in server side when we send the response back to client/user.

$_SERVER['REDIRECT_STATUS'] gives the response code, but I am not sure if this is the response code the client/user application program will get in their side.
From internet discuss, someone mentioned that $_SERVER['REDIRECT_STATUS']  always 200.

If $_SERVER['REDIRECT_STATUS']  is really the response code that the client/user gets, then this is the solution and will use this. So just need to confirm about this.

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answered

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Thanks, ~Ray

Recommend C.  These are the useful answers:
https://www.experts-exchange.com/questions/28147581/Get-HTTP-response-code-in-server-side.html?anchorAnswerId=39222127#a39222127
https://www.experts-exchange.com/questions/28147581/Get-HTTP-response-code-in-server-side.html?anchorAnswerId=39220414#a39220414