Question

Can I declare a function in php
that throws an exception?
For example:

public function read($b, $off, $len) throws IOException 

Answer 1

I misread the question, see the answer below from Gilad (which should be accepted).

Previous answer:

You could throw a new exception from the body of the function. It’s all described here

Example:

<?php
function inverse($x) {
    if (!$x) {
        throw new Exception('Division by zero.');
    }
    else return 1/$x;
}

try {
    echo inverse(5) . "\n";
    echo inverse(0) . "\n";
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}

// Continue execution
echo 'Hello World';
?>