Multiple If Statements using variable

Question

I am trying to make some logic controls on input variables $ContentPicture1Title and $ContentPicture1URL. In particular I am trying to get two rules applied in a single if statement.

In the first piece of code was everything ok. Then I messed out the code as you can see in the second snippet.

First statement (OK):

<?php if (is_null($ContentPicture1Title)){ ?>
   <div class="letter-badge"><img src="image1.jpg"></div>
<?php } else { ?>
   <div class="letter-badge"><img src="image2.jpg"></div>
<?php }?>

Second (messed) statement:

<?php if (is_null($ContentPicture1Title) && ($ContentPicture1URL)){ ?>
   <div class="letter-badge"><img src="image1.jpg"></div>
<?php } else { ?>
   <div class="letter-badge"><img src="image2.jpg"></div>
<?php }?>

Thank you in advance for your help.

I guess your second is missing the is_null(...). But your question is not very clear! — TehSphinX
– TehSphinX, Commented Jun 21, 2016 at 12:04
yes my server does not give me correct errors ! both fields are being checked for null value.. in other words empty. — Cavemanharris
– Cavemanharris, Commented Jun 21, 2016 at 12:19

Ben M. · Accepted Answer · 2016-06-21 12:20:49Z

1

Unless $ContentPicture1URL is a boolean variable, you need to invoke a function that can be evaluated as a boolean and/or compare it to another variable/value.

e.g.

if(is_null($variable1) && is_null($variable2)) {
    //Do something
}

or

if(is_null($variable1) && $variable2 == 5) {
    //Do something
}

edited Jun 21, 2016 at 12:20

answered Jun 21, 2016 at 12:05

Ben M.

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2 Comments

Phiter Over a year ago

PHP will cast the variable as boolean and return a true or false from it. Not exactly sure what are the rules, but it does. No need to be exactly a boolean

Ben M. Over a year ago

True, but the variable is evaluated as a boolean either way. (e.g. 0 == false and 1 == true). It's unlikely he would want this unless it was a numeric or boolean value.

morels · Accepted Answer · 2016-06-21 12:06:24Z

0

As you can read in official documentation you need to use the second construct:

<?php if (is_null($ContentPicture1Title) && $ContentPicture1URL): ?>

   <div class="letter-badge"><img src="image1.jpg"></div>

<?php else: ?>

   <div class="letter-badge"><img src="image2.jpg"></div>

<?php endif; ?>

This will run if $ContentPicture1URL is a boolean, otherwise you need to use compare operators ( ==, !=, &&, ||, etc.) or boolean functions (is_null()) in order to verify the condition properly.

answered Jun 21, 2016 at 12:06

morels

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