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int imagecolorclosestalpha ( resource $image , int $red , int $green , int $blue , int $alpha )

<?php
// Start with an image and convert it to a palette-based image
$im = imagecreatefrompng('figures/imagecolorclosest.png');
imagetruecolortopalette($im, false, 255);

// Colors to search (RGB)
$colors = array(
    array(254, 145, 154, 50),
    array(153, 145, 188, 127),
    array(153, 90, 145, 0),
    array(255, 137, 92, 84)
);

// Loop through each color, find the closest color in the palette
// and return the search count, searched RGB, and the closest match RGB
foreach($colors as $id => $rgb)
{
    $result = imagecolorclosestalpha($im, $rgb[0], $rgb[1], $rgb[2], $rgb[3]);
    $result = imagecolorsforindex($im, $result);
    $result = "({$result['red']}, {$result['green']}, {$result['blue']}, {$result['alpha']})";

    echo "#$id: Searched ($rgb[0], $rgb[1], $rgb[2], $rgb[3]); Closest match: $result.\n";
}

imagedestroy($im);
?>

#0: Searched (254, 145, 154, 50); Closest match: (252, 150, 148, 0).
#1: Searched (153, 145, 188, 127); Closest match: (148, 150, 196, 0).
#2: Searched (153, 90, 145, 0); Closest match: (148, 90, 156, 0).
#3: Searched (255, 137, 92, 84); Closest match: (252, 150, 92, 0).