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<?php
/*
Article Title: How to Use the imagexbm Function to Create XBM Images? A Step-by-Step Guide to Generate Black and White Image Format
*/
// XBM is a black-and-white image format commonly used for embedded systems or early web icons. PHP provides the imagexbm() function, which can save GD image resources as XBM files. Below is a step-by-step guide on how to use it.
echo " First, you need to use PHP's GD library to create an image resource. XBM images can only be black and white, so you can create an image using imagecreatetruecolor(), then convert it to black and white.1. Create a Black-and-White Image Resource
";
echo "
// Create a 100x100 pixel image
$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);
// Fill the background with white
$white = imagecolorallocate($image, 255, 255, 255);
imagefilledrectangle($image, 0, 0, $width, $height, $white);
// Draw some black patterns
$black = imagecolorallocate($image, 0, 0, 0);
imageline($image, 10, 10, 90, 90, $black);
imagerectangle($image, 20, 20, 80, 80, $black);
echo " You can save the GD image resource as an XBM file using the imagexbm() function. The syntax of the function is as follows: Here, $foreground is the color index for black pixels, with a default value of 0.2. Save the Image as an XBM File using imagexbm()
";
echo "
echo "bool imagexbm ( resource $image , string $filename [, int $foreground = 0 ] )
";
echo "
// Save as an XBM file
$filename = 'example.xbm';
imagexbm($image, $filename);
// Free the image resource
imagedestroy($image);
echo " The XBM image has been generated: $filename
echo " XBM files are commonly used as web icons or background images in CSS:3. Use the XBM Image in HTML
";
echo "
echo "<br>
<img src='example.xbm' alt='XBM Image'><br>
";
echo " Using PHP's imagexbm() function, you can quickly save black-and-white GD images as XBM format, suitable for embedded systems, vintage web icons, and other scenarios. The steps include:4. Summary
";
echo "
echo "
