On Wed, Jul 30, 2008 at 6:51 PM, Stephen <stephen-d@xxxxxxxxxx> wrote:
> I have traditionally used double quotes going back to my PASCAL days.
>
> I see many PHP examples using single quotes, and I began to adopt that
> convention.
>
> Even updating existing code.
>
> And I broke some stuff that was doing variable expansion. So I am back to
> using double quotes.
>
> But I wonder, is there any reason to use single quotes?
Single quotes means literal, whereas double quotes means translated.
For example:
<?php
// This returns exactly the same data:
$foo_a = "bar";
$foo_b = 'bar';
echo $foo_a; // bar
echo $foo_b; // bar
// This returns different data:
$foo = "bar"; // Single quotes can be used here just the same.
echo "The answer is $foo"; // The answer is bar
echo 'The answer is $foo'; // The answer is $foo
/* And if you want to use special
characters like newlines, you
MUST use double quotes. */
echo "This echoes a newline.\n"; // This echoes a newline. [newline]
echo 'This echoes a literal \n'; // This echoes a literal \n
?>
Basically, double quotes evaluate certain things and return the
evaluation, while single quotes return EXACTLY what's typed between
them.
--
</Daniel P. Brown>
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