使用PHP在mysql查询中创建动态AND子句

Question

I am writing SQL Query based on array values but I am getting the wrong result.

For Example if my array values are ['PAK','USA'] then Query should be:-

Select * From `search` WHERE country = 'PAK' AND country = 'USA'

and if array values are ['USA','China'] then Query should be:-

Select * From `search` WHERE country = 'USA' AND country = 'China'

and so on..

I am doing this but I am getting the wrong result like this:-

SELECT * FROM `search` WHERE country = '' AND country = 'Pakistan' AND country = 'United States'

I am wondering why country = '' is always adding at the beginning of Query.. This is why I am getting the wrong result. Please help me out. Thanks in advance.. Below is my code..

PHP

$query_parts = array();

foreach($_POST['countryArray'] as $array){          
    $query_parts[] = "'".$array."'";
}
$string = implode(' AND country = ', $query_parts);
//echo $string;

$query =  "SELECT * FROM `search` WHERE country = {$string}";

echo $query;

Answer 1

The code is fine.

But, blank elements from array are not restricted.

The array $_POST['countryArray'] has a blank element.

You can filter it with array_filter():

$_POST['countryArray'] = array_filter($_POST['countryArray']);

Final Code:

$query_parts = array();
$_POST['countryArray'] = array_filter($_POST['countryArray']);
foreach($_POST['countryArray'] as $array){
  $query_parts[] = "'".$array."'";
}
$string = implode(' AND country = ', $query_parts);
//echo $string;
$query =  "SELECT * FROM `search` WHERE country = {$string}";
echo $query;