real escape string and PDO

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How can I prevent SQL injection in PHP? 28 answers

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You should use PDO Prepare

From the link:

Calling PDO::prepare() and PDOStatement::execute() for statements that will be issued multiple times with different parameter values optimizes the performance of your application by allowing the driver to negotiate client and/or server side caching of the query plan and meta information, and helps to prevent SQL injection attacks by eliminating the need to manually quote the parameters .

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PDO offers an alternative designed to replace mysql_escape_string() with the PDO::quote() method.

Here is an excerpt from the PHP website:

<?php
    $conn = new PDO('sqlite:/home/lynn/music.sql3');

    /* Simple string */
    $string = 'Nice';
    print "Unquoted string: $stringn";
    print "Quoted string: " . $conn->quote($string) . "n";
?>

The above code will output:

Unquoted string: Nice
Quoted string: 'Nice'

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Use prepared statements. Those keep the data and syntax apart, which removes the need for escaping MySQL data. See eg this tutorial.

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