james@home /ezc/trunk $ php-shell.sh 
PHP-Shell - Version 0.3.1, with readline() support
(c) 2006, Jan Kneschke <jan@kneschke.de>

>> use '?' to open the inline help 

>> $a = 3; $b = (int)filter_var( $a, filter_id( 'INT' ) ); var_dump( $b ); echo $b;
int(0)
0
>> $a = 3; $b = (int)filter_var( $a, filter_id( 'INT' ) ); var_dump( $b );
3
>> echo $b
0
>> var_dump( $b )
int(0)

>> 
james@home /ezc/trunk $