Help - I need Opera detection

**martin** · Sep 15, 2003, 05:23

Hi All,

I need to do a quick test to see if a users browser is Opera. I fully understand that the end user can change the headers so that it masks itself, but I would still like to do an automatic detection if possible.

Doing a quick search of this forum and PHP.net I have managed to uncover some stuff, but basically all scripts are doing detection for all browsers, and I only need Opera.

I'm no php scripter, but I put this together copying bits and pieces (although it does not work!)

PHP Code:


<?php 

    If ( strpos ($HTTP_USER_AGENT,"Opera" ) == "1")

        $browser = "opera.css";

        $type = "Opera";

    

    else

    

        $browser = "gecko.css";

        $type = "Not Opera";



?>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>

    <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />

    

    <?php

    echo("<link rel="stylesheet" href="$browser" type="text/css" media="all" />");

    ?>

    

    <title>Detect Opera</title>

</head>

<body>

<h2>This browser is:-</h2>



<?php 

    echo ("<p>$type</p>");

?>

    

</body>

</html>

I'm trying to detect the user string and if it contains Opera then I will echo out an alternative, slightly modified css file. I understand this will not work if the user is masking as IE for example.

Thanks for any help!

**vgarcia** · Sep 15, 2003, 06:21

Use stristr() to check for Opera in the UA string. Even when identifying as another browser, the phrase "Opera" always appears in the user agent string. However, if you use standard HTML and CSS you wouldn't need to send different stylesheets based on user agents!

**martin** · Sep 15, 2003, 06:34

Yes this is true, unfortunatley Opera 7 has a bug that if you use

position: fixed;

then you do not get a horizontal scroll bar, and guess what I need that scroll bar! (this bug only appears in Opera 7).

Hence I want to send a slightly modified css for Opera. Thanks for the advance I'll give it a go.

**martin** · Sep 15, 2003, 07:16

O.K. Tried replacing 'strpos' with 'stristr' but now getting no page at all, I suspect syntax error? Here is code currently

PHP Code:


<?php 

**** If ( stristr ($HTTP_USER_AGENT ,"Opera" ) == "1" )

******** $browser ="opera.css" ;

******** $type ="Opera" ;

**** 

****else 

**** 

******** $browser ="gecko.css" ;

******** $type ="Not Opera" ;



?> 



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 

********"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 

<head> 

****<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" /> 

**** 

**** <?php 

**** echo( "<link rel=" stylesheet " href=" $browser " type=" text /css " media=" all " />" ); 

**** ?> 

**** 

****<title>Detect Opera</title> 

</head> 

<body> 

<h2>This browser is:-</h2> 



<?php 

**** echo ( "<p>$type</p>" ); 

?> 

**** 

</body> 

</html>

Any other ideas? - Thanks!

**martin** · Sep 15, 2003, 07:18

ignore the **** in the above post, these are not in my code!!

**vgarcia** · Sep 15, 2003, 16:17

Code:

If ( stristr ($HTTP_USER_AGENT ,"Opera" ) == "1" )

stristr() won't return a number, it will return the remainder of the string (the "haystack") from the phrase (the "needle") you're looking for. More info here.

What you can do is search for the existence of opera at all and work accordingly:

PHP Code:


if (stristr($_SERVER['HTTP_USER_AGENT'], "Opera")) {

  //code for true condition goes here.

}

**martin** · Sep 16, 2003, 03:59

Hi Vgarcia,

Thanks for your help with this but I am still getting no where. Currently my code reads:

PHP Code:


<?php

    if (stristr($_SERVER['HTTP_USER_AGENT'], "Opera")) {

        //code for true condition.

        $browser = "Opera" ;

    }**** 

    else {

**    //code for false condition.* 

        $browser = "Not Opera" ;

    }

?>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>

    <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />

    <title>Detect Opera</title>

</head>

<body>

<h2>This browser is:-</h2>



<?php 

    echo ("<p>$browser</p>");

?>

    

</body>

</html>

But there must be an error as I am not getting anything appearing in the browser. If I cut out the detection php at the top of the page at least I get the html part of the page, so I am assuming I have some syntax error in the php code? Sorry to be a pain but I really would like to understand why this is not working!

**martin** · Sep 16, 2003, 04:22

O.K. finally got it working, thanks for your help vgarcia. Just for anyone else interested, this code works (and will load in a different css file if required.

PHP Code:


<?php

    if (stristr($_SERVER['HTTP_USER_AGENT'], "Opera")) {

    //code for true condition

    $browser = "Opera";

    $css = "opera.css";

}

    else {

    //code for false condition

    $browser = "Not Opera";

    $css = "gecko.css";

}

?>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>

    <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />

    

    <?php

    echo("<link rel=\"stylesheet\" href=\"$css\" type=\"text/css\" media=\"all\" />");

    ?>

    

    <title>Detect Opera</title>

</head>

<body>

<h2>This browser is:-</h2>



<?php 

    echo ("<p>$browser</p>");

?>

    

</body>

</html>

thanks for all the help!

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