Optional $_GET argument

[cheesecaker]

In this random practice script I was doing, I was passing some variables to the script with the URL, which means the $_GET method.

[PHP]<?php

header("Content-type: image/png");

$textinput = $_GET['input'];

if ($_GET['size'] == '')
{
$textsize = 24;
}

else
{
$textsize = $_GET['size'];
}


$height = $textsize + 30;
$canvas = imagecreate(800,$height);
$white = imagecolorallocate($canvas,255,255,255);
$black = imagecolorallocate($canvas,0,0,0);;

$ycoord = $height * (3/4);

Imagettftext($canvas,$textsize,0,0,$ycoord,$black, 'SEGOEUI.TTF',$textinput);

imagepng($canvas);


?>[/PHP]

It's a image generation script that outputs some text as an image. (Obviously)
It works perfectly, all except for this problem:

I want the $_GET['size'] argument to be optional. However, if you don't pass "&size=" to the script, it dies because of the undefined index of $_GET['size'].

Basically, I want to make it optional so that if I don't pass it a size, it should just set the size to a default of 24 and continue on.

[jx2]

well it does work well on my server... (except for a font )

i dont see any problems so it might be due to configration of your PHP

if u believe that unspecify size cos truble u might try : if(!$_GET['size'])

regards
jx2

[ronnil]

you can always use isset().

<?php
if(isset($_GET['size']))
{
    $size = $_GET['size'];
} else {
    $size = my_standard_size
}
?>

in other cases where you might wanna swallow a possible error, you can always use '@' in front of the variable/function. e.g. @$_GET['size'] won't produce an error even if there is one, I believe it returns null...?