使用这种技术分配和检查PHP的任何问题？

Assignment and simple conditional:

$tacos = buy_taco( 3 );
if ( $tacos ) {
    eat_lunch( $tacos );
}

Does this shorthand approach have a name?

Any drawbacks or gotchas?

if ( $tacos = buy_taco( 3 ) ) {
    eat_lunch( $tacos );
}