confused with preg_match

[sonicfusion]

  

if (isset($_SERVER['HTTP_REFERER']) && !preg_match($_SERVER['HTTP_HOST'], $_SERVER['HTTP_REFERER']))
{
echo "Referer: ".$_SERVER['HTTP_REFERER'];
}

i want to check if $SERVER['HTTP_REFERER'] is set and if $SERVER['HTTP_REFERER'] is does not contain $_SERVER['HTTP_HOST'] then i want to echo out the referer.

where am i going wrong is preg_match even the correct function to use? :bemused:

sorry if this is a dumb question, i cant quite get my head round it.

[Drakla]

Preg match would be a real waste here - you're better off using strpos

if (strpos($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST']) === 0)
{
   echo "You came from here";
}

Notice there are three equals signs.

[sonicfusion]

    $referer = $_SERVER['HTTP_REFERER'];
    $host = "http://".$_SERVER['HTTP_HOST'];
    $pos = strpos($host, $referer);
    if ($pos === false) {
        echo "<br>\n you came from ".$referer;
    } else {
        echo "<br>\n you came from this site";
    }

this is what i came up with. it doesnt work correctly, $pos is ALWAYS evaluated as false, i cant find a reason for this, anyone got any ideas? thanks everyone!

[Weedpacket]

When strpos evaluates to false when it should evaluate to true:
What is the value of $referer?
What is the value of $host?

[Drakla]

point 1) I put in my example === 0, because that means it's the first thing in the string

point 2) the order of arguments are (haystack, needle) translating to (referrer, host)