(PHP 4, PHP 5)
imagesx — Get image width
Returns the width of the given image resource.
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
Return the width of the image or FALSE on errors.
Example#1 Using imagesx()
<?php
// create a 300*200 image
$img = imagecreatetruecolor(300, 200);
echo imagesx($img); // 300
?>