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You can use multiple exceptions to check for multiple conditions in your script.

You can use several if..else blocks, a switch, or nest multiple exceptions. These exceptions can use different exception classes and return different error messages:

<?php
class customException extends Exception
{
public function errorMessage()
{
//error message
$errorMsg = ‘Error on line ‘.$this->getLine().’ in ‘.$this->getFile()
.’: <b>’.$this->getMessage().’</b> is not a valid E-Mail address’;
return $errorMsg;
}
}
$email = “someone@example.com”;
try
{
if(filter_var($email, FILTER_VALIDATE_EMAIL) === FALSE)
{
//throw exception if email is not valid
throw new customException($email);
}
//check for “example” in mail address
if(strpos($email, “example”) !== FALSE)
{
throw new Exception(”$email is an example e-mail”);
}
}
catch (customException $e)
{
echo $e->errorMessage();
}
catch(Exception $e)
{
echo $e->getMessage();
}
?>

The code above tests two conditions and throws an exception if any of the conditions are not met. It works as:

• The customException() class is created as an extension of the old exception class. This way it inherits all methods and properties from the old exception class
• The errorMessage() function is created. This function returns an error message if an e-mail address is invalid
• The $email variable is set to a string that is a valid e-mail address, but contains the string “example”
• The “try” block is executed and an exception is not thrown on the first condition
• The second condition triggers an exception since the e-mail contains the string “example”
• The “catch” block catches the exception and displays the correct error message

If there was no customException catch, only the base exception catch, the exception would be handled there

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