/wp-content/plugins/ninja-forms/includes/Helper.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * Class WPN_Helper
 *
 * The WP Ninjas Static Helper Class
 *
 * Provides additional helper functionality to WordPress helper functions.
 */
final class WPN_Helper
{
    /**
     * @param $value
     * @return array|string
     */
    public static function addslashes( $value )
    {
        $value = is_array($value) ?
            array_map(array( 'self', 'addslashes' ), $value) :
            addslashes($value);
        return $value;
    }

    /**
     * @param $input
     * @return array|string
     */
    public static function utf8_encode( $input ){
        if ( is_array( $input ) )    {
            return array_map( array( 'self', 'utf8_encode' ), $input );
        }else{
            return utf8_encode( $input );
        }
    }

    /**
     * @param $input
     * @return array|string
     */
    public static function utf8_decode( $input ){
        if ( is_array( $input ) )    {
            return array_map( array( 'self', 'utf8_decode' ), $input );
        }else{
            return utf8_decode( $input );
        }
    }

    /**
     * @param $search
     * @param $replace
     * @param $subject
     * @return mixed
     */
    public static function str_replace( $search, $replace, $subject ){
        if( is_array( $subject ) ){
            foreach( $subject as &$oneSubject )
                $oneSubject = WPN_Helper::str_replace($search, $replace, $oneSubject);
            unset($oneSubject);
            return $subject;
        } else {
            return str_replace($search, $replace, $subject);
        }
    }

    /**
     * @param $value
     * @param int $flag
     * @return array|string
     */
    public static function html_entity_decode( $value, $flag = ENT_COMPAT ){
        $value = is_array($value) ?
            array_map( array( 'self', 'html_entity_decode' ), $value) :
            html_entity_decode( $value, $flag );
        return $value;
    }

    /**
     * @param $value
     * @return array|string
     */
    public static function htmlspecialchars( $value ){
        $value = is_array($value) ?
            array_map( array( 'self', 'htmlspecialchars' ), $value) :
            htmlspecialchars( $value );
        return $value;
    }

    /**
     * @param $value
     * @return array|string
     */
    public static function stripslashes( $value ){
        $value = is_array($value) ?
            array_map( array( 'self', 'stripslashes' ), $value) :
            stripslashes($value);
        return $value;
    }

    /**
     * @param $value
     * @return array|string
     */
    public static function esc_html( $value )
    {
        $value = is_array($value) ?
            array_map( array( 'self', 'esc_html' ), $value) :
            esc_html($value);
        return $value;
    }

    /**
     * @param $value
     * @return array|string
     */
    public static function kses_post( $value )
    {
        $value = is_array( $value ) ?
            array_map(  array( 'self', 'kses_post' ), $value ) :
            wp_kses_post($value);
        return $value;
    }

    /**
     * @param $value
     * @return array|string
     */
    public static function strip_tags( $value )
    {
        $value = is_array( $value ) ?
            array_map( array( 'self', 'strip_tags' ), $value ) :
            strip_tags( $value );
        return $value;
    }

    /**
     * String to Bytes
     *
     * Converts PHP settings from a string to bytes.
     *
     * @param $size
     * @return float
     */
    public static function string_to_bytes( $size )
    {
        // Remove the non-unit characters from the size.
        $unit = preg_replace('/[^bkmgtpezy]/i', '', $size);

        // Remove the non-numeric characters from the size.
        $size = preg_replace('/[^0-9\.]/', '', $size);

        if ( $unit && is_array( $unit ) ) {
            // Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
            $size *= pow( 1024, stripos( 'bkmgtpezy', $unit[0] ) );
        }

        return round($size);
    }

    public static function str_putcsv( $array, $delimiter = ',', $enclosure = '"', $terminator = "\n" ) {
        // First convert associative array to numeric indexed array
        $workArray = array();
        foreach ($array as $key => $value) {
        $workArray[] = $value;
        }

        $returnString = '';                 # Initialize return string
        $arraySize = count( $workArray );     # Get size of array

        for ( $i=0; $i<$arraySize; $i++ ) {
            // Nested array, process nest item
            if ( is_array( $workArray[$i] ) ) {
                $returnString .= self::str_putcsv( $workArray[$i], $delimiter, $enclosure, $terminator );
            } else {
                switch ( gettype( $workArray[$i] ) ) {
                    // Manually set some strings
                    case "NULL":     $_spFormat = ''; break;
                    case "boolean":  $_spFormat = ($workArray[$i] == true) ? 'true': 'false'; break;
                    // Make sure sprintf has a good datatype to work with
                    case "integer":  $_spFormat = '%i'; break;
                    case "double":   $_spFormat = '%0.2f'; break;
                    case "string":   $_spFormat = '%s'; $workArray[$i] = str_replace("$enclosure", "$enclosure$enclosure", $workArray[$i]); break;
                    // Unknown or invalid items for a csv - note: the datatype of array is already handled above, assuming the data is nested
                    case "object":
                    case "resource":
                    default:         $_spFormat = ''; break;
                }
                $returnString .= sprintf('%2$s'.$_spFormat.'%2$s', $workArray[$i], $enclosure);
                $returnString .= ($i < ($arraySize-1)) ? $delimiter : $terminator;
            }
        }
        // Done the workload, return the output information
        return $returnString;
    }

    public static function get_query_string( $key, $default = FALSE )
    {
        if( ! isset( $_GET[ $key ] ) ) return $default;

        $value = self::htmlspecialchars( $_GET[ $key ] );

        if( is_array( $value ) ) $value = $value[ 0 ];

        return $value;
    }

    public static function sanitize_text_field( $data )
    {
        if( is_array( $data ) ){
            return array_map( array( 'self', 'sanitize_text_field' ), $data );
        }
        return sanitize_text_field( $data );
    }

    public static function get_plugin_version( $plugin )
    {
        $plugins = get_plugins();

        if( ! isset( $plugins[ $plugin ] ) ) return false;

        return $plugins[ $plugin ][ 'Version' ];
    }

    public static function is_func_disabled( $function )
    {
        if( ! function_exists( $function ) ) return true;
        $disabled = explode( ',',  ini_get( 'disable_functions' ) );
        return in_array( $function, $disabled );
    }

    public static function maybe_unserialize( $original )
    {
        // Repalcement for https://codex.wordpress.org/Function_Reference/maybe_unserialize
        if ( is_serialized( $original ) ){
            // Ported with php5.2 support from https://magp.ie/2014/08/13/php-unserialize-string-after-non-utf8-characters-stripped-out/
            $parsed = preg_replace_callback( '!s:(\d+):"(.*?)";!s', array( 'self', 'parse_utf8_serialized' ), $original );
            return unserialize( $parsed );
        }
        return $original;
    }

    private static function parse_utf8_serialized( $matches )
    {
        if ( isset( $matches[2] ) ){
            return 's:'.strlen($matches[2]).':"'.$matches[2].'";';
        }
    }

} // End Class WPN_Helper