Can I mix MySQL APIs in PHP?
725
I have searched the net and so far what I have seen is that you can usemysql_ andmysqli_ together meaning:
<?php
$con=mysqli_connect("localhost", "root" ,"" ,"mysql");
if( mysqli_connect_errno( $con ) ) {
echo "failed to connect";
}else{
echo "connected";
}
mysql_close($con);
echo "Done";
?>
or
<?php
$con=mysql_connect("localhost", "root" ,"" ,"mysql");
if( mysqli_connect_errno( $con ) ) {
echo "failed to connect";
}else{
echo "connected";
}
mysqli_close($con);
echo "Done";
?>
Are valid but when I use this code what I get is:
Connected
Warning: mysql_close() expects parameter 1 to be resource, object given in D:\************.php on line 9
Done
For the first and the same except withmysqli_close(). For the second one.
What is the problem? Can't I usemysql_ andmysqli together? Or is it normal? Is the way I can check if the connections are valid at all? (theif(mysq...))
Answer
Solution:
No, you can't use
mysqlandmysqlitogether. They are separate APIs and the resources they create are incompatible with one another.There is a
mysqli_close, though.Answer
Solution:
Just to give a general answer here about all three MYSQL API's with a reference:
You can't mix any of the three (, , ) MYSQL API's from PHP together, it just doesn't work. It's even in the manual FAQ:
You need to use the same MySQL API and its related functions, from connection to querying.
Answer
Solution:
Technically you can use as many separate connections as you want, while your problem is caused by a mere typo - you only cannot use resources from one extension with functions from another, which is quite obviously.
However, you should avoid multiple connections from the same script, no matter from single API or different ones. As it will burden your database server and exhaust its resources. So, although technically you can, you shouldn't mix different extensions in your code, save for the short period of refactoring.
Answer
Solution:
MySQLiis a lot more secure thanMySQLwhich is anyway now deprecated. That's why you should stick withMySQLiand also you can't mix them as they are both different.Answer
Solution:
No, you can't use
mysqlandmysqlitogether. They are separate APIs and the resources they create are incompatible with one another.There is a
mysqli_close, though.Answer
Solution:
Just to give a general answer here about all three MYSQL API's with a reference:
You can't mix any of the three (, , ) MYSQL API's from PHP together, it just doesn't work. It's even in the manual FAQ:
You need to use the same MySQL API and its related functions, from connection to querying.
Answer
Solution:
Technically you can use as many separate connections as you want, while your problem is caused by a mere typo - you only cannot use resources from one extension with functions from another, which is quite obviously.
However, you should avoid multiple connections from the same script, no matter from single API or different ones. As it will burden your database server and exhaust its resources. So, although technically you can, you shouldn't mix different extensions in your code, save for the short period of refactoring.
Answer
Solution:
MySQLiis a lot more secure thanMySQLwhich is anyway now deprecated. That's why you should stick withMySQLiand also you can't mix them as they are both different.