/wp-content/plugins/master-slider/admin/includes/msp-admin-functions.php

<?php // admin related functions


/**
 * Get all master slider admin screen ids
 *
 * @return array
 */
function msp_get_screen_ids() {
	$the_screen_id = sanitize_title( MSWP_SLUG );

    return apply_filters( 'masterslider_admin_screen_ids', array(
    	'toplevel_page_' . $the_screen_id
    ) );
}




function msp_get_sliders_custom_css( $slider_status = 'published' ) {
	global $mspdb;
	$slider_status = sprintf( "status='%s'", $slider_status );
	$sliders_result = $mspdb->get_sliders( 0, 0, 'ID', 'DESC', $slider_status );

	$sliders_custom_css = array();

	if( $sliders_result ) {
		foreach ( $sliders_result as $slider ) {
			$sliders_custom_css[] = msp_get_slider_background_css( $slider['ID'] );
			$sliders_custom_css[] = $slider['custom_styles'];
		}
		// remove empty records from array
		$sliders_custom_css = array_filter( $sliders_custom_css );
	}

	return apply_filters( 'masterslider_get_sliders_custom_css', implode( "\n", $sliders_custom_css ), $sliders_custom_css, $sliders_result );
}


// get stored slider's custom css code from database
function msp_get_slider_custom_css( $slider_id ) {
	global $mspdb;
	$slider_custom_css = $mspdb->get_slider_field_val( $slider_id, 'custom_styles' );
	return $slider_custom_css ? $slider_custom_css : '';
}


function msp_get_slider_background_css( $slider_id ) {
	$slider_data = get_masterslider_parsed_data( $slider_id );

	$the_slider_bg  = empty( $slider_data['setting']['bg_color'] ) ? '' : $slider_data['setting']['bg_color'];
	$the_slider_bg .= empty( $slider_data['setting']['bg_image'] ) ? '' : sprintf( ' url( %s ) repeat top left', msp_get_the_absolute_media_url( $slider_data['setting']['bg_image'] ) );
	$the_slider_bg  = empty( $the_slider_bg ) ? '' : 'background:' . $the_slider_bg . ";";

	return empty( $the_slider_bg ) ? '' : sprintf( ".ms-parent-id-%d > .master-slider{ %s }", $slider_id, $the_slider_bg );
}


function msp_get_all_custom_css () {
	return apply_filters( 'masterslider_get_all_custom_css', msp_get_sliders_custom_css() );
}


/*-----------------------------------------------------------------------------------*/

/**
 * Get custom styles and store them in custom.css file or use inline css fallback
 * This function will be called by masterslider save handler
 *
 * @return void
 */
function msp_save_custom_styles() {

    $uploads   = wp_upload_dir();

	$css_dir   = apply_filters( 'masterslider_custom_css_dir', $uploads['basedir'] . '/' . MSWP_SLUG );
	$css_file  = $css_dir . '/custom.css';

    $css_terms = "/*
===============================================================
 # CUSTOM CSS
 - Please do not edit this file. this file is generated by server-side code
 - Every changes here will be overwritten
===============================================================*/\n
";
    // Get all custom css styles
    $css = msp_get_all_custom_css();

    /**
     * Initialize the WP_Filesystem
     */
    global $wp_filesystem;
    if ( empty( $wp_filesystem ) ) {
        require_once ( ABSPATH.'/wp-admin/includes/file.php' );
        WP_Filesystem();
    }

    if ( wp_mkdir_p( $css_dir ) && ! $wp_filesystem->put_contents( $css_file, $css_terms.$css, 0644 ) ) {
        // if the directory is not writable, try inline css fallback
        msp_update_option( 'custom_inline_style' , $css ); // save css rules as option to print as inline css
    } else {
    	$custom_css_ver = msp_get_option( 'masterslider_custom_css_ver', '1.0' );
    	$custom_css_ver = (float)$custom_css_ver + 0.1;
        msp_update_option( 'masterslider_custom_css_ver' , $custom_css_ver ); // disable inline css output
        msp_update_option( 'custom_inline_style' , '' );
    }

}












/**
 * Prints Pretty human-readable information about a variable (developer debug tool)
 * @param  mixed             The expression to be printed.
 * @param  boolean $dump     Whether to dump information about a variable or not
 * @param  boolean $return   When this parameter is set to TRUE, it will return the information rather than print it.
 * @return bool              When the return parameter is TRUE, this function will return a string. Otherwise, the return value is TRUE.
 */
if ( ! function_exists( 'axpp' ) ) {

	function axpp ( $expression, $dump = false, $return = false ) {
		if ( $return ) {
			return '<pre>' . print_r( $expression , true ) . '</pre>';
		} elseif ( $dump ) {
			echo '<pre>'; var_dump( $expression ); echo '</pre>';
		} else {
			echo '<pre>'; print_r ( $expression ); echo '</pre>';
		}
		return true;
	}

}