API Archaeology. Heh.
If he thinks he has troubles, he should try PHP’s string and array libraries. You can really see the accretion of “thought” there. On a related note, here are some signatures for various PHP error handlers. First, an assert handler:
function assert_handler( $file, $line, $message );
an error handler:
function error_handler( $errno, $message, $file, $line, $errcontext )
How to set an assert handler:
assert_options( ASSERT_CALLBACK, 'assert_handler' )
And an error handler:
set_error_handler( 'error_handler' )
Nobody could get it this wrong by chance. I think it’s wilful.