How To Create Dynamic Banners PHP

Video Tutorial: How To Create A Dynamic Banner in PHP

There are a lot of ways to create an image. PHP comes with a built-in library of functions we can call to create an image in the browser. This tutorial shows you how to create a dynamic banner using the PHP GD library.

References & Tools: – Set an image to your profile. We use the Gravatar email hash to generate a dynamic user image on our banner. – Steem Tools and bitcoin node. Hosts the dynamic banner created in this tutorial and a form to set dynamic parameters. – Has a list of all the PHP functions we used in the tutorial.
See below for Cheat Sheet from video.

Dynamic Banner Default

Dynamic Banner with Parameters (user/email)

Creating A Form

Instead of type ?u=myusername& in the URL, we can quickly create a form in HTML/PHP to pass those parameters and set to an image.

Cheat Sheet


PHP GD Image Functions We Will Be Using:

header('Content-type: image/png');
// Sets the browser output to display a png image

// Creates a base image to work with in size x (width) and y (height)

imagecreatefromstring( file_get_contents( $imagestring ) );
// This will create an image from a URL linked to another image.

imagecopy( $imagetocopy, $addnewstringimage, $placeat_x_onimage, $place_y_onimage, $orig_x, $orig_y, $width, $height);
// This allows us to add a new image as a layer on top of our starting image, with a basic crop option.

imagecreatefrompng( $image );
// We use this to create turn our imagecopy() function into an image format.

imagecopyresampled( $baseimage, $addedlayerimage, $placeat_x, $placeat_y, $orig_x, $orig_y, $new_w, $new_h, $orig_w, $orig_h );
// This function allows us to copy and resize the newly created image on our [background] image.

imagecolorallocate( $image, $red, $green, $blue );
// Creates a color to use for fonts or fills

imagecolorallocatealpha( $image, $red, $green, $blue, $alpha );
// Creates a color with transparency (0 = opaque; 255 = clear;)

imagefill( $image, $start_x, $start_y, $color );
// Fills in a background color for our image

imagettftext( $image, $font_size, $angle, $start_x, $start_y, $color, $font, $text );
// Creates, sizes and positions text with a TTF font on your image.
// *You want to specify the path to your font - You can download fonts for free and upload to a folder

imagepng( $image );
// Outputs your new image to the browser

imagedestroy( $image );
// Frees up your memory cache associated with the image

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