[PHP] Helper function for retrieving Google Fonts stylesheet URLs

cameronjonesweb-google-fonts.php

<?php
/**
* Generates a URL for getting a Google Font stylesheet URL
* 
* @copyright 2017 Cameron Jones
* @license MIT
* @param array $args 
* @return string URL of the Google Font family
*/
function cameronjonesweb_google_fonts( $args ) {

	$return = false;

	if( !empty( $args ) && is_array( $args ) ) {

		$return = 'https://fonts.googleapis.com/css?family=';
		$i = 0;

		foreach( $args as $key => $val ) {

			// If the key is numeric there are no weights and val is actually the family
			if( is_numeric( $key ) ) {

				$family = $val;
				$weights = array();

			} else {

				$family = $key;
				$weights = $val;

			}

			$return .= str_replace( ' ', '+', $family );

			if( !empty( $weights ) && is_array( $weights ) ) {

				$return .= ':';

				for( $j = 0; $j < count( $weights ); $j++ ) {

					$return .= $weights[$j];

					if( $j+1 < count( $weights ) ) {

						$return .= ',';

					}

				}

			}

			if( $i+1 < count( $args ) ) {

				// We have multiple families so add a seperator.
				$return .= '|';

			}

			$i++;

		}

	}

	return $return;

}

examples.php

<?php

/**
 * Get a single font with no weights.
 * Google Fonts will just return a stylesheet for the 'normal' font weight if no weights are provided.
 * @returns https://fonts.googleapis.com/css?family=Open+Sans
 */
$fonts = cameronjonesweb_google_fonts( array(
	'Open Sans'
) );

/**
 * Get a single font with weights.
 * Note weights must be an array.
 * @returns https://fonts.googleapis.com/css?family=Open+Sans:300,400
 */
$fonts = cameronjonesweb_google_fonts( array(
	'Open Sans' => array( 300, 400 )
) );

/**
 * Get multiple fonts with no weights.
 * Google Fonts will just return a stylesheet for the 'normal' font weight if no weights are provided.
 * @returns https://fonts.googleapis.com/css?family=Open+Sans|Roboto
 */
$fonts = cameronjonesweb_google_fonts( array(
    'Open Sans', 'Roboto'
) );

/**
 * Get multiple fonts with weights.
 * Note weights must be an array.
 * @returns https://fonts.googleapis.com/css?family=Open+Sans:300,400|Roboto:300,400,700
 */
$fonts = cameronjonesweb_google_fonts( array(
	'Open Sans' => array( 300, 400 ),
	'Roboto' => array( 300, 400, 700 )
) );

/**
 * Get multiple fonts, some with weights and some without.
 * Note weights must be an array.
 * Google Fonts will just return a stylesheet for the 'normal' font weight if no weights are provided.
 * @returns https://fonts.googleapis.com/css?family=Open+Sans:300,400|Lato|Roboto:300,400,700
 */
$fonts = cameronjonesweb_google_fonts( array(
	'Open Sans' => array( 300, 400 ),
	'Lato',
	'Roboto' => array( 300, 400, 700 )
) );

/**
 * Enqueue a stylesheet in WordPress
 */
function enqueue_google_fonts() {

	wp_enqueue_style( 
		'google-fonts', 
		cameronjonesweb_google_fonts( array(
			'Open Sans' => array( 300, 400 ),
			'Lato',
			'Roboto' => array( 300, 400, 700 )
		) ) 
	);

}

add_action( 'wp_enqueue_scripts', 'enqueue_google_fonts' );