Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
adrien kovanic
5,727 PointsHi I can't figure out the use of the empty braquets : echo "The number " . $checker->number . " "; thanks a lot
the question says it all :)
<?php
require_once("class.palprimechecker.php");
$checker = new PalprimeChecker();
$checker->number = 17;
echo "The number " . $checker->number . " ";
echo "(is|is not)";
echo " a palprime.";
?>
2 Answers
Benjamin Payne
8,142 PointsHey Adrien,
This could also be written like this.
<?php
require_once("class.palprimechecker.php");
$checker = new PalprimeChecker();
$checker->number = 17;
echo "The number 17 {$checker->number } a palprime"
?>
You can uaw concatenation like you are doing, using periods to bring strings together.
I cannot remember what the palprime checker returns but my example assumes it returns 'is or is not'. If it returns true / false you can use this example.
<?php
require_once("class.palprimechecker.php");
$checker = new PalprimeChecker();
$palprime = $checker->number = 17
$palprime = ($palprime === true) ? 'is' : 'is not';
echo "The number 17 $palprime a palprime"
?>
Let me know if that helps.
Best,
Ben
jpxayhijta
8,353 Pointsecho "The number " . $checker->number;