D-talk (Entries tagged as references)

PHP Quiz part 3

nospam@example.com (Mark van der Velden) — Mon, 21 Sep 2009 17:35:00 +0200

Welcome to another part of the PHP Quiz series, again some interesting questions to crack your brain about. If you have some nice additions or questions, be sure to leave a comment. Enjoy part three!

As always, think of the answer before you execute the code or look it up. You can find round two here.

Unset cast

What is the type of $a and what is the type of $b

$a = "A";
$b = (unset) $a;
var_dump($a, $b);

Form fun

What will the output be?

Fun with strings

Strings in PHP are versatile, but how versatile are they... What will the output be?

$juggling = "Itffkhmf";
$rox = "Spy";
$b = $c = "";
for ($i=0; $i<strlen($juggling); $i++) {
$b .= $juggling[ $i ];
$b++;
}
for ($i=0; $i<strlen($rox); $i++) {
$c .= $rox[ $i ];
$c--;
}

var_dump( $b, $c );

Continue reading "PHP Quiz part 3"

Did you know... part two

nospam@example.com (Mark van der Velden) — Thu, 25 Jun 2009 19:14:00 +0200

In these blog series I'd like to talk a bit about some "Did you knows". These series contain information I came across along the way and I mention them here to give you insight or just to make you aware of it's existence. The information is by no means in chronological order and mostly not even covering "state of the art" or "brand new" items for that matter. Some are directly code related, others are just brief descriptions. Basically it's just a pile of PHP and web related information. You can find part one here.

Continue reading "Did you know... part two"

PHP Quiz part 2

nospam@example.com (Mark van der Velden) — Thu, 14 May 2009 10:41:00 +0200

A short quiz this time, but that doesn't make it less fun. Do you know the answer to all of them? Get a cup of coffee and kill 10 minutes with round two...

As always, think of the answer before you execute the code or look it up. You can find round one here.

Array pointer

What will the output be ?

$array = range(0,5);
next($array);
foreach($array as $v) {
echo $v;
}

ArrayAccess and isset fun

isset or not isset, thats the question.

$a = new ArrayObject;
$a['fubar'] = NULL;
$null = NULL;

if (isset($null)) {
echo 1;
} else {
echo 2;
}

if (isset($a['fubar'])) {
echo 1;
} else {
echo 2;
}

if (array_key_exists('fubar', $a)) {
echo 1;
} else {
echo 2;
}

Typo?

The output might be confusing..

array(4>'a')

References

How many notices will be thrown?

error_reporting(E_ALL);
function a( & $array) {}
function b($array) {}
a($array);
b($array);

Continue reading "PHP Quiz part 2"

PHP and - not so real - references

nospam@example.com (Mark van der Velden) — Sat, 04 Aug 2007 09:15:00 +0200

A while ago I read somewhere about the (what I thought was a neat feature of PHP5) auto-references in PHP5. Bottom line is that it's best to not self-define referencing because the engine outsmarts you! Sara Golemon wrote a nice entry in her log here: http://blog.libssh2.org/index.php?/archives/51-Youre-being-lied-to..html. Might not be entirely true (since there is a difference), but until I read deeper into this matter I'll take these informative words as is. More internal information can be found here: http://devzone.zend.com/node/view/id/1024 Where Sara takes us into the internals of References in her tutorial "Extension Writing Part III: Resources".