php echo only if variable is exist

Question

I have two variables

<?php 
    $male = $_GET["male"];
    $female = $_GET["female"];  
 ?>

I'm trying to echo only if the variable is exist so I wrote this statement

<?php if ( $male && $female ) { ?>
    <h1>Welcome, <?php echo $male; ?> & <?php echo $female; ?></h1>
<?php } elseif ( $male ) { ?>
    <h1>Welcome, <?php echo $male; ?></h1>
<?php } elseif ( $female ) { ?>
    <h1>Welcome, <?php echo $female; ?></h1>
<?php } else { ?>
    <h1>Weclome</h1>
<?php } ?>

But now when $male and $female exist
the elseif is also true, How can I fix it?

VolkerK · Accepted Answer · 2015-12-24 23:14:34Z

2

echo '<h1>Welcome';
$sep = array(', ', ' &amp; ');
foreach (array('male', 'female') as $param) {
    if ( isset($_GET[$param]) ) {
        echo array_shift($sep), htmlentities($_GET[$param]);
    }
}
echo '</h1>';

answered Dec 24, 2015 at 23:14

VolkerK

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1 Comment

user5051310 Over a year ago

Seems a bit like overkill but I've always thought overkill is underrated

Funk Forty Niner · Accepted Answer · 2015-12-24 23:30:24Z

2

You can use the isset() to test if the variable exist or null

if(isset($male)&&isset($male)){
<h1>Welcome, <?php echo $male; ?> & <?php echo $female; ?></h1>
}

edited Dec 24, 2015 at 23:30

Funk Forty Niner

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answered Dec 24, 2015 at 23:19

Seydou Loum

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1 Comment

mickmackusa Over a year ago

if(isset($male)&&isset($male)){ looks like a perfect way to SUPER check if the variable really, REALLY exists. /s

user5051310 · Accepted Answer · 2015-12-25 05:30:19Z

1

You could use implode. You can also throw in some error checking.

$greeting = array();
if (!empty($_GET["male"]))
    $greeting[] = $_GET["male"];
if (!empty($_GET["male"]))
    $greeting[] = $_GET["male"];

if (count($greeting) > 0)
    echo "<h1>Welcome, " . implode(" & ", $greeting) . "!</h1>";
else
    echo "<h1>Who's there?</h1>";

answered Dec 25, 2015 at 5:30

user5051310

Comments

Poul Kruijt · Accepted Answer · 2015-12-24 23:11:45Z

0

Add not male and not female to the elseif. Like this:

<?php if ( $male && $female ) { ?>
    <h1>Welcome, <?php echo $male; ?> & <?php echo $female; ?></h1>
<?php } elseif ( $male && !$female ) { ?>
    <h1>Welcome, <?php echo $male; ?></h1>
<?php } elseif ( $female && !$male ) { ?>
    <h1>Welcome, <?php echo $female; ?></h1>
<?php } else { ?>
    <h1>Weclome</h1>
<?php } ?>

answered Dec 24, 2015 at 23:11

Poul Kruijt

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4 Comments

user4571629 Over a year ago

OK, but I get also error when I'm defining the 2 variables, for example if the female is not exist I get:"Undefined index: female in .... "

VolkerK Over a year ago

Your problem already starts with $male = $_GET["male"];. If there is no GET parameter male you'll get an undefined index error.

user4571629 Over a year ago

OK, what is the suggestion? to use what?

VolkerK Over a year ago

My solution, obviously ;-) For your solution you should replace $male = $_GET["male"]; by $male = $_GET['male'] ?? null; (see Null coalescing operator for a pre php7 version of that) and $female = ... correspondingly.

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