Remove inline style css

/**
 * Strip attribute Class
 * Remove attributes from XML elements
 * @author David (semlabs.co.uk)
 * @version 0.2.1
 */

class StripAttributes {

    public $str            = '';
    public $allow        = array();
    public $exceptions    = array();
    public $ignore        = array();

    function reg_escape( $str ) {
        $conversions = array( "^" => "\^", "[" => "\[", "." => "\.", "$" => "\$", "{" => "\{", "*" => "\*", "(" => "\(", "\\" => "\\\\", "/" => "\/", "+" => "\+", ")" => "\)", "|" => "\|", "?" => "\?", "<" => "\<", ">" => "\>" );
        return strtr( $str, $conversions );
    }


    public function strip( $str ) {
        $this->str = $str;

        if( is_string( $str ) && strlen( $str ) > 0 ) {
            $res = $this->findElements();
            if( is_string( $res ) )
                return $res;
            $nodes = $this->findAttributes( $res );
            $this->removeAttributes( $nodes );
        }

        return $this->str;
    }

    private function findElements() {

        # Create an array of elements with attributes
        $nodes = array();
        preg_match_all( "/<([^ !\/\>\n]+)([^>]*)>/i", $this->str, $elements );
        foreach( $elements[1] as $el_key => $element ) {
            if( $elements[2][$el_key] ) {
                $literal = $elements[0][$el_key];
                $element_name = $elements[1][$el_key];
                $attributes = $elements[2][$el_key];
                if( is_array( $this->ignore ) && !in_array( $element_name, $this->ignore ) )
                    $nodes[] = array( 'literal' => $literal, 'name' => $element_name, 'attributes' => $attributes );
            }
        }

        # Return the XML if there were no attributes to remove
        if( !$nodes[0] )
            return $this->str;
        else
            return $nodes;
    }

    private function findAttributes( $nodes ) {

        # Extract attributes
        foreach( $nodes as &$node ) {
            preg_match_all( "/([^ =]+)\s*=\s*[\"|']{0,1}([^\"']*)[\"|']{0,1}/i", $node['attributes'], $attributes );
            if( $attributes[1] ) {
                foreach( $attributes[1] as $att_key => $att ) {
                    $literal = $attributes[0][$att_key];
                    $attribute_name = $attributes[1][$att_key];
                    $value = $attributes[2][$att_key];
                    $atts[] = array( 'literal' => $literal, 'name' => $attribute_name, 'value' => $value );
                }
            }
            else
                $node['attributes'] = null;

            $node['attributes'] = $atts;
            unset( $atts );
        }

        return $nodes;
    }

    private function removeAttributes( $nodes ) {

        # Remove unwanted attributes
        foreach( $nodes as $node ) {

            # Check if node has any attributes to be kept
            $node_name = $node['name'];
            $new_attributes = '';
            if( is_array( $node['attributes'] ) ) {
                foreach( $node['attributes'] as $attribute ) {
                    if( ( is_array( $this->allow ) && in_array( $attribute['name'], $this->allow ) ) || $this->isException( $node_name, $attribute['name'], $this->exceptions ) )
                        $new_attributes = $this->createAttributes( $new_attributes, $attribute['name'], $attribute['value'] );
                }
            }
            $replacement = ( $new_attributes ) ? "<$node_name $new_attributes>" : "<$node_name>";
            $this->str = preg_replace( '/'. $this->reg_escape( $node['literal'] ) .'/', $replacement, $this->str );
        }

    }

    private function isException( $element_name, $attribute_name, $exceptions ) {
        if( array_key_exists($element_name, $this->exceptions) ) {
            if( in_array( $attribute_name, $this->exceptions[$element_name] ) )
                return true;
        }

        return false;
    }

    private function createAttributes( $new_attributes, $name, $value ) {
        if( $new_attributes )
            $new_attributes .= " ";
        $new_attributes .= "$name=\"$value\"";

        return $new_attributes;
    }

}
?>

Usage Example
$content = strip_tags($content, '<div><br><strong><em><b><img><span><p><table><tr><td>');

$sa = new StripAttributes(); $sa->allow = array('id', 'class'); $sa->exceptions = array(     'img' => array('src', 'alt'),     'a' => array('href', 'title'), ); $sa->ignore = array(); $content = $sa->strip($content);