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POIf PHP's mysql extension supposedly does not support transactions like mysqli, why do I see people using it for transactions online?
 

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  1. POIf PHP's mysql extension supposedly does not support transactions like mysqli, why do I see people using it for transactions online?
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    <p>I was reading about mysql transactions and I was under the impression that you had to use either mysqli or PDO in order to create transactions. However, I see all over stack exchange and other sites examples that use the mysql extension like this:</p> <pre><code>mysql_query("START TRANSACTION"); $rollback=0 if (!mysql_query($query1)){ $rollback=1 } if (!mysql_query($query2)){ $rollback=1 } if (!mysql_query($query3)){ $rollback=1 } if ($rollback == 1){ mysql_query("ROLLBACK"); } else{ mysql_query("COMMIT"); } </code></pre> <p>What is the difference between doing it this way and using the "special" mysqli specific functions mysqli::rollback and mysqli::commit?</p> <p>Also, what happens if the php script crashes (IE my app server crashes etc), does the DB server automatically rollback the transaction after a set timeperiod?</p> <p>Similarly, what happens if the DB server crashes before mysql_query("COMMIT")? Would the transaction be "rolled back"?</p> <p>Thanks!</p>
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