PHP : Passing DB Link Identifier into array_map's inner function

Question

Based on my previous question's answer , I have to use an inner function for array_map() as follow:

    $keyword_tokens = array_map(
        function($keyword) {
            return $this->db->escape_string(trim($keyword));
        }, $keyword_tokens
    );

$this->db is a MySQLi database wrapper, while its function escape_string() is a wrapper of mysqli_real_escape_string().

The problem is, PHP prompts error:

Fatal error: Using $this when not in object context

However, the array_map code piece is within a public function within a class. My question is: How can I reference $this->db in the array_map()'s inner function ?

Please read my previous question, prepared statements did not apply to that case. — Raptor
– Raptor, Commented Apr 17, 2013 at 6:47

Phil · Accepted Answer · 2013-04-17 04:25:01Z

2

Use the use keyword to include variables in the closure's scope, though you'll have to use a different variable to $this if you're using a PHP version prior to 5.4. Perhaps this...

$db = $this->db;
$keyword_tokens = array_map(
    function($keyword) use ($db) {
        return $db->escape_string(trim($keyword));
    }, $keyword_tokens
);

answered Apr 17, 2013 at 4:25

Phil

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