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problem with if statements

Posted on 2007-11-15
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Last Modified: 2010-05-18
in php., whats the difference between the 2 lines?

if ($HTTP_SESSION_VARS["section"] == "credit")

if ($HTTP_SESSION_VARS["section"] = "credit")
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Question by:markmchugh
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9 Comments
 
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Accepted Solution

by:
waygood earned 500 total points
ID: 20290421
the first one compares the values
the second checks the result of setting the value to "credit"

I suggest you use $_SESSION['section'] instead of $HTTP_SESSION_VARS['section']
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LVL 48

Expert Comment

by:hernst42
ID: 20290528
$HTTP_SESSION_VARS["section"] = "credit" is an assignment. You overwrite or set the content of variable $HTTP_SESSION_VARS["section"]  to credit. If youse in an if-statements it's typical a typo/bug

$HTTP_SESSION_VARS["section"] == "credit" is a comaprison if variable $HTTP_SESSION_VARS["section"] contains the value "credit"

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Author Comment

by:markmchugh
ID: 20290941
this seems to break my code?

      if ($_SESSION["section"] == "credit") {
      $_SESSION["var1"] = $frmloanamt;
      $_SESSION["var2"] = $loanterms;
      )
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LVL 48

Expert Comment

by:hernst42
ID: 20291021
what do you mean by breaking your code ?

Also to note that $HTTP_SESSION_VARS["section"] = "credit" is allways true when used in side if, as "credit" is a true value in php.
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LVL 21

Expert Comment

by:nizsmo
ID: 20291107
by break your code do you mean it doesn't execute the statements in the if statement? This is probably because $_SESSION["section"] == "credit" evaluates to false, try and echo out $_SESSION["section"] and see what value it contains.
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Author Comment

by:markmchugh
ID: 20291346
do i use $_SESSION["section"]  

or

$_SESSION['section']

to assign something?
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LVL 82

Expert Comment

by:hielo
ID: 20291723
The problem with:
 if ($_SESSION["section"] == "credit") {
      $_SESSION["var1"] = $frmloanamt;
      $_SESSION["var2"] = $loanterms;
      )
is that you have a closing parenthesis instead of brace }
Try:

session_start();
$_SESSION['section'] = 'credit';

 if ($_SESSION["section"] == "credit") {
      $_SESSION["var1"] = $frmloanamt;
      $_SESSION["var2"] = $loanterms;
}

On another note:
if ($HTTP_SESSION_VARS["section"] == "credit")
means: "is $HTTP_SESSION_VARS["section"]  equal to 'credit'?"
However:
if ($HTTP_SESSION_VARS["section"] = "credit")

is equivalent to the following two statements:
$HTTP_SESSION_VARS["section"] = "credit";
if( $HTTP_SESSION_VARS["section"] )
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LVL 21

Expert Comment

by:nizsmo
ID: 20291736
@markmchugh:

they are the same thing, and both will work :)
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LVL 21

Expert Comment

by:nizsmo
ID: 20291741
@hielo

Good spotting!
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