Border.php

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<?php

class HTMLPurifier_AttrTransform_Border extends HTMLPurifier_AttrTransform {

    public function transform($attr, $config, $context) {
        if (!isset($attr['border'])) return $attr;
        $border_width = $this->confiscateAttr($attr, 'border');
        // some validation should happen here
        $this->prependCSS($attr, "border:{$border_width}px solid;");
        return $attr;
    }

}

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