在php中插入的时间戳

Question

I have this sql query and I need to add a timestamp to a field named 'created' in a previous function that updates. I added $sqlMod = sprintf("UPDATE %s SET last_modified=now(), %s WHERE id='%s'", $table, $implodeArray, $_POST['id']); which works just fine. However I cant seem to get that syntax correct in the insert into function for it to work properly. I have tried (created, %s) VALUES ("now(), %s")... and it doesnt work.

$sql = sprintf('INSERT INTO %s (%s) VALUES ("%s")', $table, implode(', ', array_map('mysql_escape_string', array_keys($values))), implode('",  "',array_map('mysql_escape_string', $values)));

Currently: INSERT INTO projects (created, project_name, project_bold, project_content, id) VALUES ("now(), something", "something", "something", "46919705")

Answer 1

The call to NOW() should not be inside quotes, but the arguments that follow it should be quoted.

(created, %s) VALUES (now(), "%s")

Don't use mysql_escape_string(). Use the more comprehensive mysql_real_escape_string() instead. In the long run, think about switching to an API supporting prepared statements like MySQLi or PDO, although you still need to concatenate in table names for dynamic SQL such as you are doing.

Although MySQL supports double quotes, single quotes for string values are a little more standard. Swap the quoting on your string and implode() call, so the final product looks like:

$sql = sprintf("INSERT INTO %s (created, %s) VALUES (NOW(), '%s')", $table, implode(', ', array_map('mysql_real_escape_string', array_keys($values))), implode("',  '",array_map('mysql_real_escape_string', $values)));

As a last point on security for you and for future readers, we don't see the origins of $table, but if it originates from any sort of user input, it is advisable to check its value against a whitelist of acceptable table names since it cannot be adequately protected by mysql_real_escape_string().