使用shell_exec时连接被拒绝

Question

I'm trying to connect to a database using a script by shell_exec, but I'm getting:

mysqli::mysqli(): (HY000/2002): No such file or directory.

When using the script without shell_exec (example: by submit button) it works perfectly.

---

On the caller php file:

shell_exec('php /Users/Desktop/save.php param')

Called php file:

$a=$argv[1];
saveonDB($a);

I really don't know why isn't working when calling the function by shell_exec. The parameters are being passed correctly.

Thanks

---

UPDATE:

I made the example simpler:

connection.php:

function connect()
{
    $servername = "localhost";
    $username = "root";
    $password = "root";
    $dbname= "db";

    $conn = new mysqli($servername, $username, $password, $dbname);
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }
    else{
        echo "connected";
    }

}

connect();

caller.php:

    echo exec ("php /Users/Desktop/connection.php");

When executing the connection.php directly, it says:

"connected"

When executing from caller.php it stays:

"Connection failed: No such file or directory"

Answer 1

I just figure out what happened. It seems that when executing via shell_exec php uses mysql.sock. The connection port is different when using MAMP. Placing the port on the server name parameter fix the problem.

Thanks for all input.