ultimatemember/includes/core/class-validation.php

<?php
namespace um\core;

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) exit;

if ( ! class_exists( 'Validation' ) ) {
    class Validation {

        function __construct() {

            $this->regex_safe = '/\A[\w\-\.]+\z/';
            $this->regex_phone_number = '/\A[\d\-\.\+\(\)\ ]+\z/';

        }

        /***
         ***	@removes html from any string
         ***/
        function remove_html($string) {
            return wp_strip_all_tags( $string );
        }

        /***
         ***	@normalize a string
         ***/
        function normalize($string) {
            $string = preg_replace('~&([a-z]{1,2})(acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);~i', '$1', htmlentities($string, ENT_QUOTES, 'UTF-8'));
            return $string;
        }

        /***
         ***	@safe name usage ( for url purposes )
         ***/
        function safe_name_in_url( $name ) {
            $name = strtolower( $name );
            $name = preg_replace("/'/","", $name );
            $name = stripslashes( $name );
            $name = $this->normalize($name);
            $name = rawurldecode( $name );
            return $name;
        }

        /***
         ***	@password test
         ***/
        function strong_pass($candidate) {
            $r1='/[A-Z]/';
            $r2='/[a-z]/';
            $r3='/[0-9]/';
            if(preg_match_all($r1,$candidate, $o)<1) return false;
            if(preg_match_all($r2,$candidate, $o)<1) return false;
            if(preg_match_all($r3,$candidate, $o)<1) return false;
            return true;
        }

        /***
         ***	@space, dash, underscore
         ***/
        function safe_username( $string ) {

            $regex_safe_username = apply_filters('um_validation_safe_username_regex',$this->regex_safe );

            if ( is_email( $string ) )
                return true;
            if ( !is_email( $string) && !preg_match( $regex_safe_username, $string ) )
                return false;
            return true;
        }

        /***
         ***	@dash and underscore (metakey)
         ***/
        function safe_string($string){

            $regex_safe_string = apply_filters('um_validation_safe_string_regex',$this->regex_safe );

            if ( !preg_match( $regex_safe_string, $string) ){
                return false;
            }
            return true;
        }

        /***
         ***	@is phone number
         ***/
        function is_phone_number( $string ){
            if ( !$string )
                return true;
            if ( !preg_match( $this->regex_phone_number, $string) )
                return false;
            return true;
        }

        /***
         ***	@is url
         ***/
        function is_url( $url, $social = false ){
            if ( !$url ) return true;

            if ( $social ) {

                if ( !filter_var($url, FILTER_VALIDATE_URL) && strstr( $url, $social )  ) { // starts with social requested
                    return true;
                } else {

                    if ( filter_var($url, FILTER_VALIDATE_URL) && strstr( $url, $social ) ) {
                        return true;
                    } elseif ( preg_match( $this->regex_safe, $url) ) {

                        if ( strstr( $url, '.com' ) ){
                            return false;
                        } else {
                            return true;
                        }

                    }

                }

            } else {

                if ( strstr( $url, 'http://') || strstr( $url, 'https://') )
                    return true;

            }

            return false;
        }

        /***
         ***	@get a random string
         ***/
        function randomize( $length = 10 ) {
            $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
            $result = '';
            for ($i = 0; $i < $length; $i++) {
                $result .= $characters[rand(0, strlen($characters) - 1)];
            }
            return $result;
        }

        /***
         ***	@generate a password, hash, or similar
         ***/
        function generate( $length = 40 ) {
            return wp_generate_password( $length, false );
        }

        /***
         ***	@random numbers only
         ***/
        function random_number($len = false) {
            $ints = array();
            $len = $len ? $len : rand(2,9);
            if($len > 9)
            {
                trigger_error('Maximum length should not exceed 9');
                return 0;
            }
            while(true)
            {
                $current = rand(0,9);
                if(!in_array($current,$ints))
                {
                    $ints[] = $current;
                }
                if(count($ints) == $len)
                {
                    return implode($ints);
                }
            }
        }

        /***
         ***	@To validate given date input
         ***/
        function validate_date( $date, $format='YYYY/MM/D' ) {
            if ( strlen( $date ) < strlen($format) ) return false;
            if ( $date[4] != '/' ) return false;
            if ( $date[7] != '/' ) return false;
            if ( false === strtotime($date) ) return false;
            return true;
        }

    }
}