(PECL imagick 2, PECL imagick 3)
Imagick::borderImage — Surrounds the image with a border
public Imagick::borderImage ( mixed $bordercolor , int $width , int $height ) : bool
Surrounds the image with a border of the color defined by the bordercolor ImagickPixel object.
bordercolor
ImagickPixel object or a string containing the border color
width
Border width
height
Border height
 Returns true on success. 
| Version | Description | 
|---|---|
| PECL imagick 2.1.0 | Now allows a string representing the color as the first parameter. Previous versions allow only an ImagickPixel object. | 
Example #1 Imagick::borderImage()
<?php
function borderImage($imagePath, $color, $width, $height) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->borderImage($color, $width, $height);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}
?> 
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    https://www.php.net/manual/en/imagick.borderimage.php