TalkPHP - Foreach

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- - Foreach (http://www.talkphp.com/tips-tricks/2490-foreach.html)

Orc	03-19-2008 04:54 AM

Foreach

Just another method I guess :P

PHP Code:


		
			
<?php
error_reporting(E_ALL);
$_GET = array();

$_GET['a'] = "Hello World!";

if ($_GET['a'])
{
    extract($_GET);
    $t [] = $a;
    foreach(array_keys($t) As $val)
    {
        echo $t[$val];
    }
}
?>

Instead of $key => $val xD

This can be simplified but I was just having fun. :]

Wildhoney

03-20-2008 08:22 PM

...Or you can do:

php Code:

$aItems = array
(
    'Wildhoney' => 'Adam',
    'Salathe' => 'Peter',
    'Bluesaga' => 'Will'
);

while(list($szKey, $szValue) = each($aItems))
{
    printf('Key = "%s" and Value = "%s"<br />', $szKey, $szValue);
}

TlcAndres

03-20-2008 08:25 PM

Anyone care to benchmark? I'm almost sure the foreach is faster but it's nice to know none-the-less. (I'd do it but I'm shamlessly browsing whilst I'm supposed to be working)

Orc	03-20-2008 08:35 PM

Quote:

Originally Posted by Wildhoney (Post 12595)

...Or you can do:

php Code:

$aItems = array
(
    'Wildhoney' => 'Adam',
    'Salathe' => 'Peter',
    'Bluesaga' => 'Will'
);

while(list($szKey, $szValue) = each($aItems))
{
    printf('Key = "%s" and Value = "%s"<br />', $szKey, $szValue);
}

Erm.. Mine is only

PHP Code:


		
			


foreach(array_keys($array) As $key)

{

   echo $array[$key];

}

You're just making it complicated xD

Wildhoney

03-20-2008 08:39 PM

It'll be the $key => $value way by a long way, in terms of speed. We're just being silly :-)

Orc	03-20-2008 08:45 PM

Quote:

Originally Posted by Wildhoney (Post 12599)

It'll be the $key => $value way by a long way, in terms of speed. We're just being silly :-)

lol alright.

PHP Code:


		
			


foreach ($array As $key => $val)

{

   // Wildhoney >:o

   printf('%s => %s',$key,$val);

}

sjaq	03-20-2008 09:02 PM

Actually, there is a faster way for doing a foreach with key and value:

PHP Code:


		
			
$key = array_keys($aHash);
$size = count($key);
for ($i=0; $i<$size; $i++) $aHash[$key[$i]] .= "a";

source

Orc	03-20-2008 09:13 PM

Quote:

Originally Posted by sjaq (Post 12602)

Actually, there is a faster way for doing a foreach with key and value:

PHP Code:


		
			
$key = array_keys($aHash);

$size = count($key);

for ($i=0; $i<$size; $i++) $aHash[$key[$i]] .= "a";

source

I can never tell why there is a 'faster' way of doing anything in php, I mean.. The page renders fast for me, and it does so every time I refresh the browser, so meh, fast?

Wildhoney

03-20-2008 09:50 PM

Readability/Organisation > Speed.

Aaron

03-20-2008 10:26 PM

What about array_walk()?

freenity

03-20-2008 10:58 PM

Not sure what are you doing here. Why don't you like foreach ?? :S

Well, if you want some weird stuff:

PHP Code:


		
			
$ar = array();
$num = 0;

go();

function go()
{
    echo $ar[$num];
    $num ++;
    if ($num < count($ar))
        go();
}

lol :)

Orc	03-20-2008 10:59 PM

PHP Code:


		
			
$ar = array();

$num = 0;



go();



function go()

{

    echo $ar[$num];

    ++ $num;

    if ($num < count($ar))

        go();

}

Figure out what I changed xD

freenity

03-20-2008 11:05 PM

Quote:

Originally Posted by Orc (Post 12610)

PHP Code:


		
			
$ar = array();

$num = 0;



go();



function go()

{

    echo $ar[$num];

    ++ $num;

    if ($num < count($ar))

        go();

}

Figure out what I changed xD

It would give the same result.... (++$num)

Of course I forgot to put global $num, $ar....

Orc	03-20-2008 11:07 PM

Quote:

Originally Posted by freenity (Post 12612)

It would give the same result.... (++$num)

Of course I forgot to put global $num, $ar....

Of course but Im just bored :P

Wildhoney

03-21-2008 01:16 AM

How about it in a for loop?

php Code:

for
(
    $iIndex = 0, $aValue = $aItems, $aKey = array_flip($aItems);
    $iIndex < count($aItems);
    next($aValue), next($aKey), $iIndex++
) printf('Key = "%s" and Value = "%s"<br />', current($aKey), current($aValue));

maZtah

03-25-2008 09:10 AM

Damn, you guys got too much spare time.

:-)

Morishani

03-29-2008 06:41 PM

Quote:

Originally Posted by sjaq (Post 12602)

Actually, there is a faster way for doing a foreach with key and value:

PHP Code:


		
			
$key = array_keys($aHash);

$size = count($key);

for ($i=0; $i<$size; $i++) $aHash[$key[$i]] .= "a";

source

Hi, Thanks for the benchmarks ^^

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