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As a result, half of PDO's features remain in obscurity and are almost never used by PHP developers, who, as a result, are constantly trying to reinvent the wheel which Unlike those, this tutorial is written by someone who has used PDO for many years, dug through it, and answered thousands questions on Stack Overflow (the sole gold PDO badge bearer). The abstraction, however, is two-fold: one is widely known but less significant, while another is obscure but of most importance.
Following the mission of this site, this article will disprove various delusions and bad practices, while showing the right way instead. Everyone knows that PDO offers unified interface to access many different databases.
And, despite some rumors, it is impossible to switch database backends by changing a single line in PDO config - due to different SQL flavors (to do so, one needs to use an averaged query language like DQL).We have seen this function already, but let's take a closer look.It fetches a single row from database, and moves the internal pointer in the result set, so consequent calls to this function will return all the resulting rows one by one.So, for every query you run, if at least one variable is going to be used, you have to substitute it with a placeholder, then prepare your query, and then execute it, passing variables separately. In most cases, you need only two functions - prepare() and execute().First of all, you have to alter your query, adding placeholders in place of variables.