Why strpos PHP not work with fsockopen response? - php

Question

Why strpos PHP not work with fsockopen response ?
When load this code. This code will be requests sdgsgsdgsfsdfsd.ca to whois.cira.ca server and find text Domain status: available with strpos PHP if found it's will be echo
{"domain":"sdgsgsdgsfsdfsdca","availability":"available"}
but if not found text. It's will be echo
{"domain":"sdgsgsdgsfsdfsdca","availability":"TAKEN"}
In this case found text but still echo
{"domain":"sdgsgsdgsfsdfsdca","availability":"TAKEN"}
How can i do ?
<?php
$server = "whois.cira.ca";
$response = "Domain status: available";
showDomainResult(sdgsgsdgsfsdfsd.ca,$server,$response);
function checkDomain($domain_check,$server,$findText)
{
$con = fsockopen($server, 43);
if (!$con) return false;
fputs($con, $domain_check."\r\n");
$response = ' :';
while(!feof($con))
{
$response .= fgets($con,128);
}
echo $response."<BR><BR><BR><BR><BR>";
fclose($con);
if (strpos($response, $findText))
{
return true;
}
else
{
return false;
}
}
function showDomainResult($domain_check,$server,$findText)
{
if (checkDomain($domain_check,$server,$findText))
{
class Emp
{
public $domain = "";
public $availability = "";
}
$e = new Emp();
$e->domain = $domain_check;
$e->availability = "available";
echo json_encode($e);
}
else
{
class Emp
{
public $domain = "";
public $availability = "";
}
$e = new Emp();
$e->domain = $domain_check;
$e->availability = "TAKEN";
echo json_encode($e);
}
}
?>

Answer 1

you're using strpos wrong, if the string START with what you're searching for, it will return int(0), which is "kinda false" by PHP's definition. explicitly check for false, like this
return false!==strpos($response, $findText);
and make sure you're using !== not !=
and as a rule of thumb, never use loose comparison operators in PHP if you can avoid it, hilarious bugs can occur if you do: https://3v4l.org/tT4l8