navigation.php
/**
* Display SVG icons in social links menu.
*
* @param string $item_output The menu item output.
* @param WP_Post $item Menu item object.
* @param int $depth Depth of the menu.
* @param array $args wp_nav_menu() arguments.
* @return string $item_output The menu item output with social icon.
*/
function ea_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
// Change SVG icon inside social links menu if there is supported URL.
if ( 'site-footer' === $args->theme_location ) {
$svg = ea_get_social_link_svg( $item->url, 16 );
if ( ! empty( $svg ) ) {
$item_output = $svg . $item_output;
}
}
return $item_output;
}
add_filter( 'walker_nav_menu_start_el', 'ea_nav_menu_social_icons', 10, 4 );social-icons.php
<?php
/**
* Social Icons
*
* @package ClientName
* @author Bill Erickson
* @since 1.0.0
* @license GPL-2.0+
**/
/**
* Detects the social network from a URL and returns the SVG code for its icon.
*
*/
function ea_get_social_link_svg( $uri, $size = 24 ) {
return EA_Social_Icons::get_social_link_svg( $uri, $size );
}
class EA_Social_Icons {
/**
* Detects the social network from a URL and returns the SVG code for its icon.
*/
public static function get_social_link_svg( $uri, $size ) {
static $regex_map; // Only compute regex map once, for performance.
if ( ! isset( $regex_map ) ) {
$regex_map = array();
$map = &self::$social_icons_map; // Use reference instead of copy, to save memory.
$icons = scandir( get_template_directory() . '/assets/icons/social' );
$icons = array_diff( $icons, array( '..', '.' ) );
$icons = array_values( $icons );
foreach( $icons as $i => $icon ) {
$icons[ $i ] = substr( $icon, 0, -4 );
}
foreach ( $icons as $icon ) {
$domains = array_key_exists( $icon, $map ) ? $map[ $icon ] : array( sprintf( '%s.com', $icon ) );
$domains = array_map( 'trim', $domains ); // Remove leading/trailing spaces, to prevent regex from failing to match.
$domains = array_map( 'preg_quote', $domains );
$regex_map[ $icon ] = sprintf( '/(%s)/i', implode( '|', $domains ) );
}
}
foreach ( $regex_map as $icon => $regex ) {
if ( preg_match( $regex, $uri ) ) {
return ea_icon( array( 'icon' => $icon, 'size' => $size, 'group' => 'social' ) );
}
}
return null;
}
/**
* Social Icons – domain mappings.
*
* By default, each Icon ID is matched against a .com TLD. To override this behavior,
* specify all the domains it covers (including the .com TLD too, if applicable).
*
* @var array
*/
static $social_icons_map = array(
'facebook' => array(
'facebook.com',
'fb.me',
),
'feed' => array(
'feed',
),
);
}