if statement - all variables false?

[rmaij]

I am writing this update page to update one or more items in a table. I know this

if ($var1 && $var2 && $var3) {

will check if all variables are true. How do you do the same, but all variables are false.

I tried

if (!($var1 && $var2 && $var3) {

and that did not work. I also tried to start it out without the extra ()

if (!$var1....

When the form is submited, I am checking the submited variables to the original. If they equal each other then I want to say that $var1 = FALSE;
just doesn't seem right to say $var1 = TRUE;

If all are false then echo 'oops....forgot to change something'

Thanks for any help

[LordShryku]

What if there's vars aren't set? Then you'd be checking undefined variables...

You can do a false check with [man]empty[/man], and hold off the undefined variables.

if(empty($var)) {
  do_something();
}
# This will equate true is the variable is 
# not set, is 0, is false or is ''

If you wanted to be strict about it

if(isset($var) && $var === false) {
# Would only euate true if the variable is set and is false

[rmaij]

But the variables aren't empty. They are being posted via a form and are equal to something.

First I am checking each one

 if (!($_POST['var1_updated'] == $_POST['var1_original'])) {
               \\update the query
                $query .= "column='{$_POST['var1_updated']}'";
  }else{
                 $var1 = FALSE;
   }

so then at the end I want to check if all the variables I said were equal to false are all false. So

if $var1 and $var2 and $var3 are all equal to FALSE then the user did not make any changes.

Thanks for input though LordShryku.

[LordShryku]

Here's another method that would probably be easier. Actually two, depending what you want to do. Not to say yours can't be done, this just saves else statements and lookups towards the end.

First way: If you don't need to keep track of what's being updated.

$counter = 0;
if(first_check) {
   $sql .= ' blah blah blah';
   $counter++;
}

if(second_check) {
   $sql .= ' blah blah blah';
   $counter++;
}

if(third_check) {
   $sql .= ' blah blah blah';
   $counter++;
}

# Now check the count
if($count == 0) {
   // no updates were done
}

Now if you did need to keep track, change it up to an array.

$check = array();
if(first_check) {
   $sql .= ' blah blah blah';
   $check[] = 'first_check';
}

if(second_check) {
   $sql .= ' blah blah blah';
   $check[] = 'second_check';
}

if(third_check) {
   $sql .= ' blah blah blah';
   $check[] = 'third_check';
}

# Now do the count
if(count($check) == 0) {
   // no updates were done
}
else {
   // echo what updates were done
}

[SD-Syndicate]

I Know Im Still A Newbie With Php But Ive Done Something Rather Similar To What Yous Are Talking About.

$update1 = $_POST['var1_updated'];
$original1 = $_POST['var1_original'];
$update2 = $_POST['var2_updated'];
$original2 = $_POST['var2_original'];

// Check First Variable
if ($update1 <> $original1) { 
mysql_query("UPDATE table SET column='$update1' WHERE name='joe'");
}else{ 
$var1 = false; 
} 

// Check Second Variable
if ($update2 <> $original2) { 
mysql_query("UPDATE table SET column='$update2' WHERE name='joe'");
}else{ 
$var2 = false; 
} 

if ($var1=='false' || $var2=='false'){
echo 'oops....forgot to change something';
}

I Havent Exactly Tested This But Im Sure It Should Work, In Theory.....

[rmaij]

SWEET! Thanks for the input guys........

I see the line now