함수 is null()

1 PHP

var_dump( is_null(null) );
# bool(true)

var_dump( is_null(0) );
var_dump( is_null("") )
# bool(false)
# bool(false)

2 Python

print (None is None)
# True
print (0 is None)
print ("" is None)
print (False is None)
# False
# False
# False

print (None == None)
# True
print (0 == None)
print ("" == None)
print (False == None)
# False
# False
# False

3 같이 보기

• NULL
• 함수 isset()