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SQL - Insert statement from array

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Last Modified: 2016-04-28
I am using a SQL insert statement into a table taking field from a survey form.  It worked fine until they wanted to add some questions with checkbox answers.  I created a checkbox array and have to sanitize the input.  I can't figure out where the echo goes, I tried a couple of positions but it bombed the page - if I don't use the echo I get "array" inserted into the table instead of the value of the checkbox.

exploring is the checkbox array

Here is an example of the insert statement
INSERT INTO survey SET
		,$exploring='" .$this->real_escape_string(implode(',', $_POST['exploring'])). "' 
			,stay_informed_yes='" . $this->real_escape_string($_POST['stay_informed_yes']) . "'
			,stay_informed_no='" . $this->real_escape_string($_POST['stay_informed_no']) . "'

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