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PHP

Posted by Jeff Busch
Jeff Busch
19,287 Points

Single vs Double Quotes (I must have missed it in the tracks)

Below is an excerpt from THE JOY OF php PROGRAMMING.

In PHP, it matters if you create a string surrounded by single quotes or double quotes. If you enclose a string within single quotes PHP will return that exact string. When you enclose a string in double quotes, any variables within the string will be substituted for their values.

<?php

echo 'this is a string';
echo "<br>this is a string";
// both output the same thing
$icecream = "chocolate";
echo '<br>I like $icecream icecream'; // prints I like $icecream icecream
echo "<br>I like $icecream icecream"; // prints I like chocolate icecream

?>

3 Answers

Hampton Paulk
Hampton Paulk
5,093 Points

Jeff Busch - Good info.

I think about it like this:

double quotes are for anything that needs evaluation single quotes are for everything else

echo 'hey there fella!';

echo "hey there $name!";

if you want to get even more crafty how about evaluation inside of a string, or escape sequences.

This is where the docs come into play.

http://www.php.net/manual/en/language.types.string.php

php can handle some awesome stuff when it comes to strings...

Andrew McCormick
Andrew McCormick
17,730 Points
Andrew McCormick
Andrew McCormick
17,730 Points

indeed

Alan Mattan贸
Alan Mattan贸
12,329 Points
Alan Mattan贸
Alan Mattan贸
12,329 Points

" vs ' Can you expand the concept of, "evaluation", please.

Is apply to this ?

$_GET['value']; vs $_GET["value"];

or

header('Location: confirmed.php'); vr header("Location: confirmed.php");

Are the same?