redirect with variable php using header function

Question

how do i send a php variable (boolean) with a redirect. For example a flag is set if a condition is true

if($url = 'someurl.com'){
   $flag = true;
    header('Location: newpage.php?$flag');
    exit();
}

then mypage.php needs to check if its true or false to execute a function

i tried this but it doesn't work

header('Location: mypage.php?$flag');

perhaps there is a better way of doing it?, this is the 2nd redirect on the page, the first redirect checks checks for a login, then it proceeds to check the $flag variable, no output has been done at this stage

thanks in advance for any advice

Variables don't get expanded (interpolated) when they're in single-quotes. Use double-quotes instead. — Amal
– Amal, Commented Jun 13, 2014 at 9:29
Isn't newpage.php?flag=1 something you see every day? That's how. — Jon
– Jon, Commented Jun 13, 2014 at 9:29

Fluffeh · Accepted Answer · 2014-06-13 09:43:11Z

2

Variables don't work in single quotes - Also you need to use a comparison operator in an if statement - not an assignment:

if($url == 'someurl.com')
{
    $flag = 'someText';
    header("Location: newpage.php?$flag");
    exit();
}

or

header('Location: mypage.php?'.$flag);

edited Jun 13, 2014 at 9:43

answered Jun 13, 2014 at 9:29

Fluffeh

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1 Comment

Fluffeh Over a year ago

@bartek LMAO, I had it right but then went back to improve the answer. Copied the wrong stuff again. Good show!

robinp7720 · Accepted Answer · 2014-06-13 09:34:18Z

0

Sending true in a variable wont work for this, you have to set it to $flag="true" and you have to use double quotes.

And a single equals means your setting a variable 2 equals means your checking if a variable is equal to something

if($url == 'someurl.com'){
   $flag = "true";
    header("Location: newpage.php?$flag");
    exit();
}

answered Jun 13, 2014 at 9:34

robinp7720

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1 Comment

user1899802 Over a year ago

thank you, the double quotes done the trick i also had some basic syntax errors that i didn't see after spending to long looking at it, sometime the most basic errors are hardest to find because you think you couldn't make such a mistake,

Think Different · Accepted Answer · 2014-06-13 09:31:59Z

0

Change your if condition to

 if($url == 'someurl.com'){ ....

And the set the header as

 header('Location: mypage.php?flag='.$flag);

answered Jun 13, 2014 at 9:31

Think Different

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Comments

xdazz · Accepted Answer · 2014-06-13 09:33:09Z

0

$flag = '1';
header('Location: newpage.php?flag='.$flag);

Then in newpage.php, check with $_GET['flag'].

answered Jun 13, 2014 at 9:33

xdazz

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Comments

Rakesh Sharma · Accepted Answer · 2014-06-13 09:34:55Z

0

try == operator to check in if() and variable need to correct add with header url use concat(.)

if($url == 'someurl.com'){

and

header('Location: newpage.php?'.$flag);

edited Jun 13, 2014 at 9:34

answered Jun 13, 2014 at 9:29

Rakesh Sharma

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Comments

Ranjith · Accepted Answer · 2014-06-13 09:35:34Z

0

You need to concatenate php variable with string using dot(.) operator.

Try this.

header('Location: newpage.php?'.$flag);

Also check your condition with comparison operator(==)

  if($url == 'someurl.com') {
     ....
  }

$url = 'someurl.com' it means assigning a string into $url

edited Jun 13, 2014 at 9:35

answered Jun 13, 2014 at 9:29

Ranjith

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