Passing class to Function

[KenHorse]

I'm using php_serial.class.php, called once

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require_once("php_serial.class.php");

and call it $serial:

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$serial = new phpSerial;

in a global.php file that sets up the serial com parameters.

In another file, I include global.php that contains my other code to send and read from the class

In a function, I pass the class:

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function checkInput($serial){

And one in the Function:

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$read = $serial->readPort();

This throws an error: "PHP Fatal error: Uncaught Error: Call to a member function readPort() on string"

If I do the $read outside of the Function, it doesn't throw the error so I assume I'm doing something wrong passing the class to the function?

[Strider64]

See how $read is made up by doing

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 echo "<pre>" . print_r($read, 1) . "</pre>; 

My guess $reading isn't a variable though the error message is basically saying that. .