在php中取消双引号

My PHP code is:

$query="select company_name from company_names where cik=".$cik;

Which on printing gives

select company_name from company_names where cik=0001001871

I would like to get the output like

select company_name from company_names where cik='0001001871'

How do I add the single quotes in PHP?

Simply:

$query = "select company_name from company_names where cik = '$cik'";

Or:

$query = "select company_name from company_names where cik = '" . $cik . "'";

Notice that to prevent SQL Injection, see this:

• Best Way to Prevent SQL Injection

More Info:

• http://php.net/manual/en/language.types.string.php

$query="select company_name from company_names where cik='".$cik."'";