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PHP, 24 25 27 bytes <?=do{echo$i;}while($i); // Also 24b <?=$i;for(;$i&1;)echo$i; // 24b, added PHP's short echo, actually made it less echo$i;for(;$i&1;)echo$i; // 25b echo$i;while($i&1)echo$i; // 2 …

PHP, 158 151 function r($a,$b){$a=explode('/',$a);$b=explode('/',$b);foreach($a as $k=>$v){if($v==$b[$k])$b[$k]='..';else break;}unset($b[0]);echo implode('/',$b);} Ungolfed: function r($a,$b){ …

PHP - 75/115 68/109 Two versions, newer php versions can do this: echo preg_replace_callback("/\d+/",function($m){return$m[0]*$f;},$s); Older php versions: I did not count the newline, added those …

PHP, 47,43,40 38 bytes <?=sqrt($w*$w+$h*$h)/$d>300?'Retina':'Trash'?>! <?=sqrt($w*$w+$h*$h)/$d>300?Retina:Trash?>! <?=$w*$w+$h*$h>9e4*$d*$d?Retina:Trash?>! <?=hypot($w,$h)/$d>300?Retina:Trash?> …

PHP, 10 8 bytes The for(;;) solution has been posted enough, Time for this one: while(1) while(1){}

PHP, no separator - 62, 61,59,58,52,49 47 It doesn't say there should be a space/newline/separator between them, without: while(++$i<501)echo$i%3*!strpbrk($i,3)?$i:bzzt; With the separator, 68,67, …

PHP, 76, 70, 65, 62 51 bytes Legen... wait for it... <?while(+date(is));?>dary! Previous logic (63b): Legen... wait for it... <?for($h=date(G);date(G)==$h;)?>dary! This kind of coding makes you loos …

PHP, 26 23 31 bytes <?=join(' ',range(1,$argv[1])); // 31 if using N isnt allowed <?=join(' ',range(1,$n)); // 25 if using $n is allowed <?=join(' ',range(1,N)); // 24 bytes, join() is an alias o …

PHP, 38 35 bytes <?=strlen(join(range(0,$argv[1]))); // 35 bytes <?=strlen(join("",range(0,$argv[1]))); // 38 bytes Useage: php file.php 8 The join is a little used alias of implode(), and php can ea …

PHP, 27 bytes Not a very serieus answer, it requires a change in the php.ini settings as pi() defaults to 14 digits, not 200, but for once the PHP solution is fairly elegant: <?=strpos(pi(),$_GET[n])- …

php, 41 bytes Where $s is the string: str_replace(array(1,0,2),array(2,1,0),$s) This works because the str_replace() function is just a loop when given an array. This works like this: replace al …

PHP - 84 79 78 bytes <?php define('N',3); // <- didnt count these bytes as TS said I could take var N as input ?> <?="__ \ \ \ \ ".str_repeat(" __\ \ \ __\ \ \ ",N-1)." \ \ \/" View the re …

PHP error via a warning(), 62, 52 46 bytes I feel dirty for these, but it isn't about pretty: function g($s){echo$s!=google?strlen($s):g();} This will give "Warning: Missing argument 1 for g()" wh …

PHP, 10 bytes. Not very special, but it's rare for PHP to be short :) <?=1#1-=?<

PHP, 56-25 = 31 bytes I wanted one where size of the code doesn't matter: <?=str_repeat(file_get_contents(__FILE__),$n!=''?$n:2)?> Or a more modern version: <?=str_repeat(file_get_contents(__FILE__), …