PHP 手冊
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# Booleans

Booleans are created just like longs, but have the type IS_BOOL. Allowed values in lval are 0 and 1:

    zval *new_bool;

    MAKE_STD_ZVAL(new_bool);

    new_bool->type = IS_BOOL;
    new_bool->value.lval = 1;

The corresponding macros for this type are ZVAL_BOOL (allowing specification of the value) as well as ZVAL_TRUE and ZVAL_FALSE (which explicitly set the value to TRUE and FALSE, respectively).

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