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PHP PDO, question about bindValue() and bindParam()

elepil
elepil asked
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Last Modified: 2015-03-18
From my experimentations, bindValue() seems to be able to take ANYTHING. For example, all the following work without issuing an error message:

$stmt->bindValue(:firstname, $a);
$stmt->bindValue(:firstname, 1);
$stmt->bindValue(:firstname, "1");
$stmt->bindValue(:firstname, "Jo" + "hn");
$stmt->bindValue("firstname, 100-99);

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Now I know some of the above are nonsensical since even though the placeholder is :firstname, I'm passing all kinds of crud to it without getting any kind of MySQL error. I can even pass in numeric and string values, even string concatenations and numeric calculations, and the query would execute smoothly.

So what is bindParam() even for? Does anyone even use it?? If so, for what?

Thanks.
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