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Bug #24456 fgets returning different result
Submitted: 2003-07-02 06:25 UTC Modified: 2003-07-02 06:29 UTC
From: chris dot baxter at ic24 dot net Assigned:
Status: Not a bug Package: Sockets related
PHP Version: 4.3.1 OS: Windows XP and Redhat 7.2
Private report: No CVE-ID: None
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From: chris dot baxter at ic24 dot net
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 [2003-07-02 06:25 UTC] chris dot baxter at ic24 dot net
Description:
------------
PHP 4.2.3 works as I would expect. When doing an fgets($string,3) I get 3 char's returned, in my instance ACK.

as from 4.3.1 up to and including the new 5.0b the same code only returns AC I then have to do a further fgets to collect the K of my packet.


Reproduce code:
---------------
<?php
	$connect_to = "localhost";
	print "Connecting To: $connect_to <br>";
	$fp = fsockopen ($connect_to,2100,&$error,$errdesc,60);
	$out_data = "This is a test. Expecting 'ACK' returned followed a string of data";
	fputs($fp,$out_data);
	$page = fgets($fp,3);
	print "in1: $page <br>";
	$page = fgets($fp,512);
	print "in2: $page <br>";
?>

Expected result:
----------------
in1: ACK
in2: The rest of my data

Actual result:
--------------
in1: AC
in2: KThe rest of my data

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 [2003-07-02 06:29 UTC] wez@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Please read the manual carefully:

\"Returns a string of up to length - 1 bytes read from the file pointed to by handle. Reading ends when length - 1 bytes have been read, on a newline (which is included in the return value), or on EOF (whichever comes first).\"

versions < 4.3 were not following this behaviour.

However, what this really means is that your script is broken;  if you are expecting \"ACK\\r\\n\", you should be using fread() to read 5 bytes and then check the return value.
 
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