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POOSCommerce tep_db_input vs tep_db_prepare_input
 

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    <p>I am working on a project that uses OSCommerce with MySQL and I'm confused as to when I should use tep_db_input() or tep_db_prepare_input(). I'd assume I should use tep_db_input() around any strings that are being inserted/updated, but then when should the other function be used?</p> <p>For example, if I were to <em>SELECT</em> some data from the database, and use the result to then <em>INSERT</em> a row into another table, do I need to prepare the input at some point? Or just use tep_db_input again?</p> <pre><code>$width = '3"'; // 3 inches $new_height = '3\' 5"'; // 3 feet 5 inches $result = tep_db_query( "SELECT height FROM measurements WHERE width = '".tep_db_input($width)."'" ); while ($row = tep_db_fetch_array($result)) { tep_db_query( "INSERT INTO measurement_history ( field, old_value, new_value ) VALUES ( 'height', '".tep_db_input($row['height'])."', '".tep_db_input($new_height)."' )" ); } </code></pre> <p>Is this correct?</p> <p><strong>Edit::</strong> In case anyone isn't familiar with those functions, here are their definitions:</p> <pre><code>function tep_sanitize_string($string) { $patterns = array ('/ +/','/[&lt;&gt;]/'); $replace = array (' ', '_'); return preg_replace($patterns, $replace, trim($string)); } function tep_db_input($string, $link = 'db_link') { global $$link; if (function_exists('mysql_real_escape_string')) { return mysql_real_escape_string($string, $$link); } elseif (function_exists('mysql_escape_string')) { return mysql_escape_string($string); } return addslashes($string); } function tep_db_prepare_input($string) { if (is_string($string)) { return trim(tep_sanitize_string(stripslashes($string))); } elseif (is_array($string)) { reset($string); while (list($key, $value) = each($string)) { $string[$key] = tep_db_prepare_input($value); } return $string; } else { return $string; } } </code></pre>
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