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How good or bad is the SQL filtering?


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I have a SQL statement which is difficult to use PDO on, it might not even be possible to do.

So I'm filtering it like this:

$search = $_GET['search'];
$search = preg_replace("/[^A-Za-z0-9]/", " ", $search);
$search = $mysqli->real_escape_string($search);

Will this result in an acceptable level of security?

Edited by anderson_catchme
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None of this is a valid reason for giving up a robust solution in favor of some homegrown “filtering” stuff.


In fact, this makes absolutely no sense whatsoever. Where are the quotes? Why on earth would you replace non-alphanumerics with spaces? What is the mysqli_real_escape_string() supposed to do when you've already removed all of its target characters?

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