How can I write the following statement in PHP:
If body ID = "home" then insert some html, e.g.
<h1>I am home!</h1>
Otherwise, insert this html:
<p>I'm not home.</p>
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6 Answers
Doing it with native PHP templating:
<?php if ($bodyID==='home') { ?>
<h1>I am home!</h1>
<?php } else { ?>
<p>I'm not home!</p>
<?php } ?>
7 Comments
RobertPitt
At 92K you should know your comparison operators sir, should always use
== as a Equal check rather then an Identical, you don'y know if the OP is using objects that uses __tostring() ?
bobince
Why would I want an object that uses
__tostring() to be equal? That would seem to cause more bugs that it would solve. (Personally, I would prefer an exception if I compare a string to a non-string, as it would almost certainly mean I've made a mistake.) Meanwhile, the equality operator brings with it some seriously bad baggage (like string-as-number comparison) that I definitely don't want. The more-often-likely-to-be-correct comparator is ===.
lnvrt
Thanks bobince. I have tried this but it is not working for me either. I am inserting it into a header.php template file. Is there anything I'm missing?
bobince
What are you getting as output? What does
$bodyID actually contain? Is it even being executed?lnvrt
The body ID is <body id="home"> with all the HTML in it. Other pages have <body class="internal"> and they are all reading from the same header.php file which I am inserting your code into. The output I'm getting from your code is the same on all pages, "I'm not home".
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You can try using this :
$html = '';
if ( $body_id === 'home' )
{
$html .= '<h1>I am home!</h1>';
}
else
{
$html .= '<p>I\'m not home.</p>';
}
echo $html;
This will echo the html code depending on the $body_id variable and what it contains.
6 Comments
Oxyrubber
depending on how newbie the OP is, you probably want to use the "<?php" at the beginning of the file.
Etienne Marais
Its always good practice to assign the HTML code to a variable and dump it all at once when execution is done, but thats debatable for different types of output required
Etienne Marais
@Hannes Its good practice to always type check in an if-statement. It keeps your code to a standard and does not affect performance in any way what so ever for a script this small.
bobince
@Hannes: the double-equals operator is crazy and quite unsatisfactory.
'123'==' 123'. @etbal: I would avoid putting output HTML in strings. You just give yourself an extra layer of escaping to worry about. PHP is a templating language, might as well use it.
Hannes
@etbal @bobince but in this particular case the typecheck serves no purpose and in fact under certain conditions can even break the code, please consider this example pastebin.com/01TCMebV if you check
$body_id == 'home' for all intense and purposes $body_id must be a string |
You can use a switch command like so:
switch($body)
{
case 'home': //$body == 'home' ?
echo '<h1>I am home!</h1>';
break;
case 'not_home':
default:
echo '<p>I'm not home.</p>';
break;
}
The default means that if $body does not match any case values, then that will be used, the default is optional.
Another way is as you say, if/else statements, but if within template / view pages you should try and use like so:
<?php if ($body == 'home'):?>
<h1>I am home!</h1>
<?php else:?>
<p>I'm not home!</p>
<?php endif; ?>
4 Comments
lnvrt
Thanks, the last piece of code looks like the cleanest, but I can't get it to work. I'm inserting it into a header.php file... Is there something I'm missing?
RobertPitt
Update with what code you have at the moment, and echo out
$body to see what it contains ?lnvrt
Sorry Robert, I don't get you?
RobertPitt
If you update your quest with the code that your trying to fix, we can take a look at it
Assuming $bodyID is a variable:
<?php
if ($bodyID==='home') {
echo "<h1>I am home!</h1>";}
else {
echo "<p>I'm not home!</p>";}
?>
Comments
Personally I think that the best way to do that without refreshing and without having to set a variable (like $body or something like that) is to use a javascript code, this because "communications" between JS & PHP is a one-way communication.
<script language="javascript">
<!--
if( document.body.id === "home" ){
window.document.write("<h1>I am home!</h1>") ;
}
else{
window.document.write("<p>I'm not home!</p>") ;
}
-->
</script>
otherwise you can build a form and then take the body.id value using $_GET function... It always depends on what you've to do after you now body.id value.
Hope this will be usefull & clear.
1 Comment
lnvrt
Thanks iDiot, I wish I could use javascript! This client I've got is strictly no js, so it's a tough one!
you can try in the following way:
$body_id = "home";
if ($body_id == "home") {
echo "I am home!";
} else {
echo "I am not home!";
}
or
$body_id = "home";
if (strcmp($body_id, "home") !== 0) {
echo 'I am not home!';
}
else {
echo 'I am home!';
}
Reference:
https://www.geeksforgeeks.org/string-comparison-using-vs-strcmp-in-php/
Comments
