显示一个文章自定义字段的列表。

function the_meta() {
	_deprecated_function( __FUNCTION__, '6.0.2', 'get_post_meta()' );
	$keys = get_post_custom_keys();
	if ( $keys ) {
		$li_html = '';
		foreach ( (array) $keys as $key ) {
			$keyt = trim( $key );
			if ( is_protected_meta( $keyt, 'post' ) ) {
				continue;
			}

			$values = array_map( 'trim', get_post_custom_values( $key ) );
			$value  = implode( ', ', $values );

			$html = sprintf(
				"

n”,
/* translators: %s: Post custom field name. */
esc_html( sprintf( _x( ‘%s:’, ‘Post custom field name’ ), $key ) ),
esc_html( $value )
);

/**
* Filters the HTML output of the li element in the post custom fields list.
*
* @since 2.2.0
*
* @param string $html The HTML output for the li element.
* @param string $key Meta key.
* @param string $value Meta value.
*/
$li_html .= apply_filters( ‘the_meta_key’, $html, $key, $value );
}

if ( $li_html ) {
echo “

n{$li_html}

n”;
}
}
}