Mobile detection for NGINX Synthesis accounts

gistfile1.php

<?php
/**
 * Basic mobile detection for Synthesis accounts with NGINX caching.
 *
 * @since 1.0.0
 * @return boolean
 */
function ja_is_mobile() {

	if ( empty( $_SERVER['HTTP_USER_AGENT'] ) )
		return false;

	$agent          = strtolower( $_SERVER['HTTP_USER_AGENT'] );
	$mobile         = false;
	$mobile_devices = array( 'android', 'iphone', 'ipod', 'winphone8' );
	$tablet_devices = array( 'tablet', 'tablet-android' );

	// Check for mobile device user agent
	foreach ( $mobile_devices as $device ) {
		if ( false !== strrpos( $agent , $device ) ) {
			$mobile = true;
		}
	}

	// Check for tablet user agent part, which will override the first check
	foreach ( $tablet_devices as $device ) {
		if ( false !== strrpos( $agent , $device ) ) {
			$mobile = false;	
		}
	}

	return $mobile;
}

/**
 * Load mobile changes and tweaks if needed.
 */
if ( ja_is_mobile() ) {
	require_once( CHILD_DIR . '/inc/mobile.php' );
}