only echo html if a $get condition is met
Question
I am redirecting various messages from a header and echoing them onto a new page. How can I change this so that the html only appears if there is a message variable to echo. ie, if one of the $_GET conditions are met? Thanks
$message="";
if(isset($_GET['pw']))
{
$message = "first message";
}
else if(isset($_GET['em']))
{
$message = "second message";
}
else if(isset($_GET['fn']))
{
$message = "third message";
}
else if(isset($_GET['ln']))
{
$message = "forth message";
}
?>
<html>
<body>
<table class='tab2'>
<td class='td2'><?php echo $message; ?></td>
</table>
</body>
<html>
5 answers
solution1
2 2012-07-18 23:54:38
<?php
if($message)
{
?>
<html>
....
</html>
<?php
}
?>
solution2
1 2012-07-19 00:13:12
You can use this:
<?php
$message="";
if(isset($_GET['pw']) && !empty($_GET['pw']))
{
$message = "first message";
}
else if(isset($_GET['em']) && !empty($_GET['em']))
{
$message = "second message";
}
else if(isset($_GET['fn']) && !empty($_GET['fn']))
{
$message = "third message";
}
else if(isset($_GET['ln']) && !empty($_GET['ln']))
{
$message = "forth message";
}
echo $message;
?>
Demo: http://shaquin.tk/experiments/get-conditions.php
It checks to see if a $_GET variable is defined, and if it is not empty, sets $message to the appropriate message.
See empty - PHP Manual and isset - PHP Manual .
EDIT:
If you want to display multiple messages, use this code:
$message=array();
if(isset($_GET['pw']) && !empty($_GET['pw']))
{
$message[] = "first message";
}
if(isset($_GET['em']) && !empty($_GET['em']))
{
$message[] = "second message";
}
if(isset($_GET['fn']) && !empty($_GET['fn']))
{
$message[] = "third message";
}
if(isset($_GET['ln']) && !empty($_GET['ln']))
{
$message[] = "forth message";
}
echo implode("\n", $message);
Demo: http://shaquin.tk/experiments/get-conditions2.php
It initializes $message as an array, then adds to the array if a condition is met.
Before printing the message, it implode s it, using a newline character as 'glue'.
See implode - PHP Manual .
For an HTML page, you would probably want to set the 'glue' as a <br /> element, like this:
echo implode('<br />', $message);
(or if you are using HTML4):
echo implode('<br>', $message);
solution3
0 2012-07-18 23:51:58
<?php if (!empty($message)) { echo $message;}?>
or
<?php if (isset($message)) { echo $mssage;}?>
or
<?php if (($message !== "") || (isset($message)) { echo $message; } ?>
or anything to do if message exists then do this
solution4
0 2012-07-18 23:59:11
You can do
if ($message != "") { ?>
All your HTML code (including echo $message) goes here
<?php
} else { do nothing here }
?>
solution5
-1 2012-07-19 00:11:10
Everyone's answer has pretty much the same idea but, specifically, here is how you can do it:
$message="";
if(isset($_GET['pw']))
{
$message = "first message";
}
else if(isset($_GET['em']))
{
$message = "second message";
}
else if(isset($_GET['fn']))
{
$message = "third message";
}
else if(isset($_GET['ln']))
{
$message = "forth message";
}
?>
<?php if ($message) :?>
<html>
<head>
<style type='text/css'>
.tab2
{
width:400px; height:40px;
position: absolute; right: 300px; top: 70px;
}
.td2
{
background-color:pink;
color:blue;
text-align:center;
}
</style>
</head>
<body>
<table class='tab2'>
<td class='td2'><?php echo $message; ?></td>
</table>
</body>
<html>
<?php endif;?>
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