generate a dynamic mysql query

php code where I am trying to generate a dynamic mysql query for https://www.experts-exchange.com/questions/28975524/Get-error-when-search-query-run-in-loop.html?anchor=a41837368&anchorAnswerId=41837368#a41837368
The query is giving me error.
php code is

if($skillsMain) {
		// Search for employees from Table: employee_info
		 $sql_search = "SELECT * FROM employee_info WHERE 1 = 1 ";
		if($city!='') {
			$sql_search .= " AND city='$city' ";
		}
		
		if($skillsMain!='' && $skillsMain!='.' & $skillsMain!=',') {
			$sql_search .= " AND ( ";
			$skillsArr = explode(',', $skillsMain); 
			$arrCount = count($skillsArr);
			$counter = 1;
			foreach($skillsArr as $skills){
				$skills = trim($skills);
				$sql_search .=  "( key_skills LIKE '%$skills%' OR  job_title LIKE '%$skills%' OR  current_designation LIKE '%$skills%' OR  company_name LIKE '%$skills%' OR  objective LIKE '%$skills%' OR  resum_headline LIKE '%$skills%' OR  job_responsibility LIKE '%$skills%' OR  institute LIKE '%$skills%' OR  institute LIKE '%$skills%')";
				if($counter < $arrCount) {
					$sql_search .=  " OR ";
				}
				$counter ++;
			}
			$sql_search .= " ) ";
			
		}

		// Filter by Experience
		if($exp_min && $exp_max) {
			$sql_search .= " AND total_experience between $exp_min and $exp_max";
		} else if($exp_min) {
			$sql_search .= " AND total_experience > $exp_min";
		} else if($exp_max) {
			$sql_search .= " AND total_experience < $exp_max";
		} else if($experience!='')
		{
			$sql_search .= " AND total_experience=$experience";
		}
		// Filter By Salary
		if($sal_min && $sal_max) {
			$sql_search .= " AND salary between $sal_min and $sal_max";
		} else if($sal_min) {
			$sql_search .= " AND salary > $sal_min";
		} else if($sal_max) {
			$sql_search .= " AND salary < $sal_max";
		} else if($salary!='')
		{
			$sql_search .= " AND salary='$salary'";
		}
		
		if($func!='') {
			$sql_search .= " and functional_area='$func'";
		}
		if($inds!='') {
			$sql_search .= " and industry='$inds'";
		}
		if($qual!='') {
			$sql_search .= " and qualification='$qual'";
		}
	// for keywords
	 if($keywords!='' && $refineskills!='' ) {
		$sql_search .= " and job_description LIKE '%".$keywords."%' or  skills LIKE '%".$keywords."%' ";
	}

		$sql_search .= " GROUP BY  uid DESC";
		$sql_search .=  " UNION ";
		$arrCount1 = count($skillsArr);
		$counter1 = 1;
		foreach($skillsArr as $skills1){
				$skills1 = trim($skills1);
				$sql_search .= "(SELECT `id` , `uid` ,  `pre_company_name` ,  `pre_industry` ,  `pre_functional_area` ,  `pre_job_date` ,  `pre_job_date_month` ,  `pre_responsibility`   FROM prev_companies WHERE pre_company_name LIKE '%".$skills1."%' OR pre_industry LIKE '%". $skills1 ."%' OR pre_functional_area LIKE '%". $skills1 ."%' OR pre_responsibility LIKE '%". $skills1 ."%')";
				if($counter1 < $arrCount1) {
					$sql_search .=  " OR ";
				}
				$counter1 ++;
			} 
			
		
		echo $sql_search;

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