Here is how to create an image in PHP with background in two colors. First create a background for the image, with imagefill() function, then draw a rectangle on the half of the image, with imagefilledrectangle() function.
Three examples are presented in this page, with the colors for background displayed: horizontally, vertically, and diagonally (on half-diagonal).

1. - Example, PNG image with background in red and white, horizontally. The image is displayed directly in browser.
<?php
// http://coursesweb.net/php-mysql/

// Create a 160x80 image
$width = 160;
$height = 80;
$im = imagecreatetruecolor($width, $height);

// sets red color for background
$red = imagecolorallocate($im, 255, 0, 0);
imagefill($im, 0, 0, $red);

// sets and draw a white rectangle
$white = imagecolorallocate($im, 255, 255, 255);
imagefilledrectangle($im, 0, $height/2, $width, $width/2, $white);

// sets and adds a text
$text = 'CoursesWeb.net';
$text_color = imagecolorallocate($im, 0, 1, 255);
imagestring($im, 5, 12, $height/3.3, $text, $text_color);

// Display directly the image
header('Content-Type: image/png');
imagepng($im);
?>
Results:
PHP image in two colors horizontally
2. - Another example, PNG image with background in two colors, vertically. The image is saved on server.
<?php
// http://coursesweb.net/php-mysql/

// Create a 160x80 image
$width = 160;
$height = 80;
$im = imagecreatetruecolor($width, $height);

// sets a color for background
$red = imagecolorallocate($im, 80, 120, 250);
imagefill($im, 0, 0, $red);

// sets and draw a green rectangle in left half
$white = imagecolorallocate($im, 0, 245, 1);
imagefilledrectangle($im, 0, 0, $width/2, $height, $white);

// sets and adds a red text
$text = 'CoursesWeb.net';
$text_color = imagecolorallocate($im, 225, 0, 1);
imagestring($im, 5, 12, $height/3, $text, $text_color);

// Saves the image in 'imgs' folder
imagepng($im, 'imgs/image.png');
?>
Results:
PHP image in two colors vertically
3. To create the background with two colors on half-diagonal, draw a triangle on the image, on the half-diagonal, with the imagefilledpolygon() function.
- Example:
<?php
// http://coursesweb.net/

// Create a 160x80 image
$width = 160;
$height = 80;
$im = imagecreatetruecolor($width, $height);

// sets red color for background
$red = imagecolorallocate($im, 255, 0, 0);
imagefill($im, 0, 0, $red);

// sets and draw a green triangle on the half-diagonal
$white = imagecolorallocate($im, 8, 235, 9);
imagefilledpolygon($im, array(0, 0, 0, $height, $width, $height), 3, $white);

// sets and adds a text
$text = 'CoursesWeb.net';
$text_color = imagecolorallocate($im, 0, 1, 255);
imagestring($im, 5, 12, $height/3.3, $text, $text_color);

// Saves the image in 'imgs' folder
imagepng($im, 'imgs/image.png');
?>
Results:
PHP image in two colors diagonally

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag create a highlighted bolded text?
<q> <strong> <em>
<p>Address: <strong>http://CoursesWeb.net/</strong> - Tutorials.</p>
Which of these CSS codes displays the text bolded?
text-size: 18px; font-style: italic; font-weight: 800;
#id {
  font-weight: 800;
}
What JavaScript function can be used to call another function multiple times, to a specified time interval?
setInterval() setTimeout() push()
function someFunction() { alert("CoursesWeb.net"); }
setInterval("someFunction()", 2000);
Click on the correctly defined variable in PHP.
var vname = 8; $vname = 8; $vname == 8;
$vname = 8;
echo $vname;
Image in PHP with background in two colors

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