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bool imagealphablending ( resource $image , bool $blendmode )

<?php
// Create an image
$im = imagecreatetruecolor(100, 100);

// Enable blending mode
imagealphablending($im, true);

// Draw a square
imagefilledrectangle($im, 30, 30, 70, 70, imagecolorallocate($im, 255, 0, 0));

// Output
header('Content-type: image/png');

imagepng($im);
imagedestroy($im);
?>