[Tut] Automatically Get Width & Height Of An Image

[risker]

Automatically Get Width & Height Of An Image

If you are working with file uploads, or if you simply need the width and height of an image/flash file, then this magical function in PHP is a must use: getimagesize

If you require to get the width and height of a image or flash file, or your working with file uploads,then this is your PHP script you want to use which the function we are going to use is : Getimagesize

 <?

//Here's our file. It's a flash animation with the name of animation.swf
$file = "Files/animation.swf";

//To get the height and width automatically, we use the "getimagesize" function built into PHP
//We use the list function to get the width and height values from the getimagesize function. Width goes first, height second.
list($width, $height) = getimagesize($file);

//Display the width and height
echo "Width = $width and Height = $height";

?>  

This very useful function can be used to make very simple uploaders. It also can be used to dynamically resize images. Here's how we'll resize an image to half of its size, no matter what the size is:

 <?

//Our image file. (It could be a flash file if you wanted, but for this example, we'll use an image)
$file = "Images/Big/20303991/image.jpg";

//Get width and height of the image.
list($width, $height) = getimagesize($file);

//Now make the width and height half their values
$width = $width/2;
$height = $height/2;

//Now display the image
echo "<img src='$file' width='$width' height='$height' />";

?>  

I hope you've learnt something from this

[Wynthar]

Extension to your tutorial. Some logic to reduce an image to a set height and width proportionally.

     $size = getimagesize($image);
    $width = 160; // Max Width
    $height = 120; // Max Height
    if ($size[0] > $size[1] * $width / $height ) {
        $height = round($size[1]*width/$size[0]);
    } else {
        $width = round($size[0]*$height/$size[1]);
    }
    echo "<img src=\"".$image."\" height=\"$height\" width=\"$width\" />"; 
  

Nice Mini Tutorial Risker.

Peace,
-Wynthar

[risker]

Thanks wyntha ^^

+Rep

[Serverman]

yay ^^ Finally someone else that know php ^^

[dog_keeper]

we should make a php group <3 xD

[risker]

we should make a php group <3 xD

You ain't welcome zack..
Just.. not .. welcome..

BTW WE HAVNT TALKED MUCH LATELY
I miss you

[Serverman]

uhm.... pwnd

[risker]

I declare me and server the presidents of the club ;D