UserSpice Validate.php - custom version

<?php
/*
UserSpice 4
An Open Source PHP User Management System
by the UserSpice Team at http://UserSpice.com

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
class Validate
{
    public
            $_errors = [],
            $_db     = null;

    public function __construct()  {
        $this->_db = DB::getInstance();
    }

    public function check($source, $items=[], $sanitize=true) {
        $this->_errors = [];

        foreach ($items as $item => $rules) {
            $item    = sanitize($item);
            $display = $rules['display'];

            foreach ($rules as $rule => $rule_value) {
                $value = $source[$item];

                if ($sanitize)
                    $value = sanitize(trim($value));

                $length = is_array($value) ? count($value) : strlen($value);
                $verb   = is_array($value) ? "are"         : "is";

                if ($rule=='required'  &&  $length==0) {
                    if ($rule_value)
                        $this->addError(["{$display} {$verb} required",$item]);
                }
                else
                if ($length != 0) {
                    switch ($rule) {
                        case 'min':
                            if (is_array($rule_value))
                                $rule_value = max($rule_value);

                            if ($length < $rule_value)
                                $this->addError(["{$display} must be a minimum of {$rule_value} characters",$item]);
                            break;

                        case 'max':
                            if (is_array($rule_value))
                                $rule_value = min($rule_value);

                            if ($length > $rule_value)
                                $this->addError(["{$display} must be a maximum of {$rule_value} characters",$item]);
                            break;

                        case 'matches':
                            if (!is_array($rule_value))
                                $rule_value = [$rule_value];

                            foreach ($rule_value as $current_item)
                                if ($value != $source[$current_item])
                                    $this->addError(["{$items[$current_item]['display']} and {$display} must match",$item]);
                            break;

                        case 'unique':
                            $table  = is_array($rule_value) ? $rule_value[0] : $rule_value;
                            $fields = is_array($rule_value) ? $rule_value[1] : [$item, '=', $value];

                            if ($this->_db->get($table, $fields)) {
                                if ($this->_db->count())
                                    $this->addError(["{$display} already exists. Please choose another {$display}",$item]);
                            } else
                                $this->addError(["Cannot verify {$display}. Database error",$item]);
                            break;

                        case 'unique_update':
                            $t     = explode(',', $rule_value);
                            $table = $t[0];
                            $id    = $t[1];
                            $query = "SELECT * FROM {$table} WHERE id != {$id} AND {$item} = '{$value}'";
                            $check = $this->_db->query($query);

                            if ($check->count())
                                $this->addError(["{$display} already exists. Please choose another {$display}",$item]);
                            break;

                        case 'is_numeric': case 'is_num':
                            if ($rule_value  &&  !is_numeric($value))
                                $this->addError(["{$display} has to be a number. Please use a numeric value",$item]);
                            break;

                        case 'valid_email':
                            if(!filter_var($value,FILTER_VALIDATE_EMAIL))
                                $this->addError(["{$display} must be a valid email address",$item]);
                            break;

                        case '<'  :
                        case '>'  :
                        case '<=' :
                        case '>=' :
                        case '!=' :
                        case '==' :
                            $array = is_array($rule_value) ? $rule_value : [$rule_value];

                            foreach ($array as $rule_value)
                                if (is_numeric($value)) {
                                    $rule_value_display = $rule_value;

                                    if (!is_numeric($rule_value)  &&  isset($source[$rule_value])) {
                                        $rule_value_display = $items[$rule_value]["display"];
                                        $rule_value         = $source[$rule_value];
                                    }

                                    if ($rule=="<"  &&  $value>=$rule_value)
                                        $this->addError(["{$display} must be smaller than {$rule_value_display}",$item]);

                                    if ($rule==">"  &&  $value<=$rule_value)
                                        $this->addError(["{$display} must be larger than {$rule_value_display}",$item]);

                                    if ($rule=="<="  &&  $value>$rule_value)
                                        $this->addError(["{$display} must be equal {$rule_value_display} or smaller",$item]);

                                    if ($rule==">="  &&  $value<$rule_value)
                                        $this->addError(["{$display} must be equal {$rule_value_display} or larger",$item]);

                                    if ($rule=="!="  &&  $value==$rule_value)
                                        $this->addError(["{$display} must be different from {$rule_value_display}",$item]);

                                    if ($rule=="=="  &&  $value!=$rule_value)
                                        $this->addError(["{$display} must equal {$rule_value_display}",$item]);
                                }
                                else
                                    $this->addError(["{$display} has to be a number. Please use a numeric value",$item]);
                            break;

                        case 'is_integer': case 'is_int':
                            if ($rule_value  &&  filter_var($value, FILTER_VALIDATE_INT)===false)
                                $this->addError(["{$display} has to be an integer",$item]);
                            break;

                        case 'is_timezone':
                            if ($rule_value)
                                if (array_search($value, DateTimeZone::listIdentifiers(DateTimeZone::ALL)) === FALSE)
                                    $this->addError(["{$display} has to be a valid time zone name",$item]);
                        break;

                        case 'in':
                            $verb           = "have to be";
                            $list_of_names  = [];   // if doesn't match then display these in an error message
                            $list_of_values = [];   // to compare it against

                            if (!is_array($rule_value))
                                $rule_value = [$rule_value];

                            foreach($rule_value as $val)
                                if (!is_array($val)) {
                                    $list_of_names[]  = $val;
                                    $list_of_values[] = strtolower($val);
                                } else
                                    if (count($val) > 0) {
                                        $list_of_names[]  = $val[0];
                                        $list_of_values[] = strtolower((count($val)>1 ? $val[1] : $val[0]));
                                    }

                            if (!is_array($value)) {
                                $verb  = "has to be one of the following";
                                $value = [$value];
                            }

                            foreach ($value as $val) {
                                if (array_search(strtolower($val), $list_of_values) === FALSE) {
                                    $this->addError(["{$display} {$verb}: ".implode(', ',$list_of_names),$item]);
                                    break;
                                }
                            }
                        break;

                        case 'is_datetime':
                        if ($rule_value !== false) {
                            $object = DateTime::createFromFormat((empty($rule_value) || is_bool($rule_value) ? "Y-m-d H:i:s" : $rule_value), $value);

                            if (!$object  ||  DateTime::getLastErrors()["warning_count"]>0  ||  DateTime::getLastErrors()["error_count"]>0)
                                $this->addError(["{$display} has to be a valid time",$item]);
                        }
                        break;
                    }
                }
            }

        }

        return $this;
    }

    public function addError($error) {
        if (array_search($error, $this->_errors) === FALSE)
            $this->_errors[] = $error;
    }

    public function display_errors() {
        $html = "<UL CLASS='bg-danger'>";

        foreach($this->_errors as $error) {
            if (is_array($error))
                $html    .= "<LI CLASS='text-danger'>{$error[0]}</LI>
                             <SCRIPT>jQuery('document').ready(function(){jQuery('#{$error[1]}').parent().closest('div').addClass('has-error');});</SCRIPT>";
            else
                $html .= "<LI CLASS='text-danger'>{$error}</LI>";
        }

        $html .= "</UL>";
        return $html;
    }

    public function errors(){
        return $this->_errors;
    }

    public function passed(){
        return empty($this->_errors);
    }
}