Description:
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PHP allows default parameters to appear before required parameters

From http://www.php.net/manual/en/functions.arguments.php,

It reports that...

<?php
function makeyogurt($type = "acidophilus", $flavour)
{
    return "Making a bowl of $type $flavour.\n";
}
 
echo makeyogurt("raspberry");   // won't work as expected
?>

will generate this output:

Warning: Missing argument 2 in call to makeyogurt() in 
/usr/local/etc/httpd/htdocs/phptest/functest.html on line 41
Making a bowl of raspberry .

I think this is simply nasty behavior.  If $type is defaulted and not specified, PHP should know that it's a default parameter from the parameter count and shift accordingly or generate a syntax error.  A default parameter that appears to the left of a required parameter isn't optional with the way parameters are processed in PHP today.

I would rather have seen one of these results:

Error: makeyogurt() specifies required parameters after defaulted parameters in /usr/local/etc/httpd/htdocs/phptest/functest.html on line 41.

or

Making a bowl of acidophilus raspberry.

While the second solution was rejected in http://bugs.php.net/24153, I believe the first solution is still valid and quite frankly, appropriate.  If nothing else, this should be an option in php.ini to prohibit optional parameters before required parameters.

C programmers are familiar with being able to do this by turning on -Wall -Werror

Reproduce code:
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See description

Expected result:
----------------
See description

Actual result:
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See description