boursecu_server/app/DB/Te/Search.php

<?php
namespace App\DB\Te;

use App\Support\PersianText;

/**
 * Created by PhpStorm.
 * User: AraNote
 * Date: 12/04/2018
 * Time: 10:32 PM
 */
class Search
{

    protected $cols, $text, $query;

    public static function query(&$query, $cols, $search)
    {
        $like = PersianText::likePattern(strtolower((string) $search));
        $query->where(function ($q) use ($cols, $like) {
            $first = true;
            foreach ($cols as $col) {
                if (self::hasJoin($col)) {
                    $exp = explode('.', $col);
                    if (sizeof($exp) > 2) {
                        if ($first){
                            $whereHas = 'whereHas';
                        }else{
                            $whereHas = 'orWhereHas';
                        }
                        $q->$whereHas
                        ($exp[0], function ($q) use ($exp, $like) {
                            return $q->whereHas($exp[1], function ($q2) use ($exp, $like) {
                                return $q2->whereRaw(self::foldedLikeSql($exp[2]), [$like]);
                            });
                        });
                    } else {
                        if ($first){
                            $whereHas1 = 'whereHas';
                        }else{
                            $whereHas1 = 'orWhereHas';
                        }
                        $q->$whereHas1
                        ($exp[0], function ($q) use ($exp, $like) {
                            return $q->whereRaw(self::foldedLikeSql($exp[1]), [$like]);
                        });
                    }
                } else {
                    if ($first){
                        $where = 'whereRaw';
                    }else{
                        $where = 'orWhereRaw';
                    }
                     $q->$where(self::foldedLikeSql($col), [$like]);
                }
                if ($first) {
                    $first = false;
                }
            }
        });
    }

    private static function foldedLikeSql(string $column): string
    {
        return PersianText::sqlFoldExpr('lower(`'.$column.'`)').' like ?';
    }

    public static function hasJoin($col)
    {
        return sizeof(explode('.', $col)) > 1;
    }

}