wp_rel_callback( array $matches, string $rel )
Callback to add a rel attribute to HTML A element.
Description Description
Will remove already existing string before adding to prevent invalidating (X)HTML.
Parameters Parameters
- $matches
-
(array) (Required) Single match.
- $rel
-
(string) (Required) The rel attribute to add.
Return Return
(string) HTML A element with the added rel attribute.
Source Source
File: wp-includes/formatting.php
function wp_rel_callback( $matches, $rel ) {
$text = $matches[1];
$atts = wp_kses_hair( $matches[1], wp_allowed_protocols() );
if ( ! empty( $atts['href'] ) ) {
if ( in_array( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_SCHEME ) ), array( 'http', 'https' ), true ) ) {
if ( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_HOST ) ) === strtolower( wp_parse_url( home_url(), PHP_URL_HOST ) ) ) {
return "<a $text>";
}
}
}
if ( ! empty( $atts['rel'] ) ) {
$parts = array_map( 'trim', explode( ' ', $atts['rel']['value'] ) );
$rel_array = array_map( 'trim', explode( ' ', $rel ) );
$parts = array_unique( array_merge( $parts, $rel_array ) );
$rel = implode( ' ', $parts );
unset( $atts['rel'] );
$html = '';
foreach ( $atts as $name => $value ) {
if ( isset( $value['vless'] ) && 'y' === $value['vless'] ) {
$html .= $name . ' ';
} else {
$html .= "{$name}=\"" . esc_attr( $value['value'] ) . '" ';
}
}
$text = trim( $html );
}
return "<a $text rel=\"" . esc_attr( $rel ) . '">';
}
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Changelog Changelog
| Version | Description |
|---|---|
| 5.3.0 | Introduced. |