[RESOLVED] combining 3 if statements

[Desbrina]

I'm trying to combine 3 if statements into one.

I can get two of them working but not when i add the third.

The three statements are (without the unneeded stuff):

if(isset($_POST['Submit'])) {
}
if($_POST['amount'] == '') {
}
if($_POST['amount'] == '0') {
}

The two i can get working

if((isset($_POST['Submit'])) && ($_POST['amount'] != '')) {

And when i try all three together, its acts as though the submit button has been pressed when it hasn't. I suspects its something to do with my brackets but not sure

if(((isset($_POST['Submit'])) && (($_POST['amount'] != '')) || ($_POST['amount'] != '0'))) {

What i'm trying to do is:
If the submit button has been pressed and amount doesn't equal 0 or has been left empty, submit the form, else do nothing

[laserlight]

Desbrina wrote:

If the submit button has been pressed and amount doesn't equal 0 or has been left empty, submit the form, else do nothing

I think you mean "process the form" rather than "submit the form". What you want to write is:

if (isset($_POST['Submit'], $_POST['amount']) && $_POST['amount'] != '' && $_POST['amount'] != 0) {
    // Process the form.
    // ...
}

However, you could also write it as:

if (isset($_POST['Submit']) && !empty($_POST['amount'])) {
    // Process the form.
    // ...
}

[Desbrina]

thanks, the first one worked perfectly. I don't think the second one would have been what i wanted since it didn't contain the check for if they had entered 0

[nrg_alpha]

Desbrina;10896120 wrote:

thanks, the first one worked perfectly. I don't think the second one would have been what i wanted since it didn't contain the check for if they had entered 0

Actually, I would consider Laserlight's second option the better of the two, as by using !empty(), this is basically killing two birds with one stone so-to-speak, as a variable equal to nothingness '' or zero '0' both are considered empty.

Consider the following test:

$str01 = '';
$str02 = '0';
if(!empty($str01) && !empty($str02)){
   echo 'not empty';
} else {
   echo 'empty';
}

The output will be empty, as the value of '' and '0' both consistitue as empty being true.

[bpat1434]

Desbrina, take a look at the manual page for [man]emtpy/man. The following items will return "true" (as in yes, it's considered empty):

*  "" (an empty string)
* 0 (0 as an integer)
* "0" (0 as a string)
* NULL
* FALSE
* array() (an empty array)
* var $var; (a variable declared, but without a value in a class)

The only other check that I'd run to make sure a string wasn't empty was to [man]trim/man the string. That would ensure a string with nothing but spaces, or tabs would not pass through and possibly muck up your program.