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<?php // This is not true/false bolean either. var_dump( (bool) null ); // These do not directly correlate to boolean, // i.e. they don't mean the same as boolean. var_dump( (bool) array( false ) ); var_dump( (bool) new stdClass ); var_dump( (bool) 'This is an example string.' ); var_dump( (bool) static function() { return false; } ); // Anonmyous function: callback.
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true) bool(true) bool(true) bool(true)

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