bool和==运算的有关问题

Beware of certain control behavior with boolean and non boolean values :




// Consider that the 0 could by any parameters including itself

var_dump(0 == 1); // false

var_dump(0 == (bool)'all'); // false

var_dump(0 == 'all'); // TRUE, take care

var_dump(0 === 'all'); // false



// To avoid this behavior, you need to cast your parameter as string like that :

var_dump((string)0 == 'all'); // false

?>