Helper Functions

functions.php

/**
 * The main logging function
 *
 * @uses error_log
 * @param string $type type of the error. e.g: debug, error, info
 * @param string $msg
 */
public static function log( $type = '', $msg = '' ) {
    if ( WP_DEBUG == true ) {
        $msg = sprintf( "[%s][%s] %s\n", date( 'd.m.Y h:i:s' ), $type, $msg );
        error_log( $msg, 3, dirname( __FILE__ ) . '/log.txt' );
    }
}
/**
 * Helper function for converting a normal date string to unix date/time string
 *
 * @since 0.1
 * @param string $date
 * @param int $gmt
 * @return string
 */
function lddos_date2mysql( $date, $gmt = 0 ) {
    if (empty( $date ) ) {
        return;
    }
    $time = strtotime( $date );

    return ( $gmt ) ? gmdate( 'Y-m-d H:i:s', $time ) : gmdate( 'Y-m-d H:i:s', ( $time + ( get_option( 'timezone_string' ) * 3600 ) ) );
}
/**
 * Helper function for removing https or http from Google fonts. 
 *
 * @since 0.1
 * @param string $date
 * @param int $gmt
 * @return string
 */
add_filter( 'style_loader_tag',  'remove_https_http', 10, 4 );
function remove_https_http( $html, $handle, $href, $media ){
	$handles = array('et-gf-open-sans', 'divi-fonts', 'twentysixteen-fonts', 'open-sans');
	if( in_array( $handle, $handles) ){
		$html = str_replace('https:', '', $html);	
	}
	return $html;
}

/**
 * Helper function for path in 4.7 version including get_parent_theme_file_uri() and get_parent_theme_file_path(). 
 *
 * @since 0.1
 * @param string $date
 * @param int $gmt
 * @return string
 */
wp_enqueue_script(
    'my-script',
    get_theme_file_uri( 'js/my-script.js' ),
    array(),
    filemtime( get_theme_file_path( 'js/my-script.js' ) )
);