What is the PHP fsockopen function return value

Ask PHP Fsockopen function return value
Ask the following code. How to tell if the Fsockopen connection is successful?

Because if it fails, fwrite will generate a lot of error messages in my space.
PHP warning:fwrite (): supplied argument is not a valid stream resource in/home2/

I want to add judgment, if Fsockopen fail to skip, avoid error execution fwrite

Thank you! Please help

$fp = Fsockopen ("www.example.com", $errno, $errstr, 30);
if (! $fp) {
echo "$errstr ($errno) \ n ";
} else {
$out = "get/http/1.1\r\n";
$out. = "host:www.example.com\r\n";
$out. = "connection:close\r\n\r\n";


Fwrite ($fp, $out);
while (!feof ($fp)) {
Echo fgets ($FP, 128);
}
Fclose ($FP);
}


------Solution--------------------
The code is no problem, this is the PHP official website example. You should stick your code out.

Alternatively, you can try this, if (Get_resource_type ($fp) = = ' stream ') fwrite ($fp, $out);
------Solution--------------------
You are not judging here. You can just add a withdrawal.

if (! $fp) {
echo "$errstr ($errno)
\ n ";
Exit
} else {
....
------Solution--------------------
while (!ereg (' $ OK ', $banreturn) && (!ereg (' 302 Found ', $banreturn)) && ($attemp <2)) {
$connection = Fsockopen ($hostname, $port, $errno, $errstr, $timeout);
Stream_set_timeout ($connection, 5);
Fwrite ($connection, $headers); The error record is generated here, but not every time.

Why not first check if Open is successful or write?

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