Value=0 is not a value?
 

Hi there,

<?php

if ($b03 && $b04 && $b05 && $b07 && $b07 && $b09 && $b10)

{

?>

display this line

<?php
//endif
}?>

$b03 has a value of "0" - Why does php treat "0" as no value? No value would be if nothing is entered in this case. 0 is a possible value.

Can someone explain this to me? Also, if I'm coding things the wrong way here please tell me!

Thanks,

Gil

What's the error? I'm not that familiar with the 0 thing, but if its a string, it should be handled correctly. When you set $B03, was it with quotes or just the value. Actually, that shouldn't be the problem but...maybe its treated as a null value since 0 does nothing in PHP. Try making it a string.

Hi There,

There's no error. It's quite a simple little script with if/else statements.

$bo3 is a textfield without a default value. I'm checking 5 textfields here for a value and "0" is treated as empty/no value. It doesn't matter if I leave this field empty or enter "0".

Unfortunately, I'm not too good with strings yet, just my guitar strings.

Thanks,

Gil

That manual section explains it all:
http://www.php.net/manual/en/languag...oolean.casting

So if you have a string "0" and do an implicit cast to boolean (in the if statement), you've got bad luck. Try to use strlen() to determine if a string length is greater than 0 - which indicates that the user has set a value for this input field.

Try this:

Do not create a variable for $test (as in, do not give it a value( and enter this:

if ($test == '0') {
echo "weird!";
}

Notice, it prints weird. 0 is given to any variable without a value. Thus, I guess it got confused! :D

Hi,
You are right but the example below shows that "" is not always handled as 0 nor is zero handled as "". I can use this.


<?php

$test1 ="0";
if ($test1=="0"){
$test1=true;
}
if ($test1){
echo "<p>true";
}
else {
echo "<p>false";
}

$test2 ="";
if ($test2==""){
$test2=true;
}
if ($test2){
echo "<p>true";
}
else {
echo "<p>false";
}

$test3 ="";
if ($test3=="0"){
$test3=true;
}
if ($test3){
echo "<p>true";
}
else {
echo "<p>false";
}

?>

Bye bye

Gil

What you can do to see if a variable contains a zero is use the isset(); function :
SHould work.....