2024年4月29日发(作者：)

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( '/'. 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;

}