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in versions after php 4.2.0, the key will be assigned with a null value.
if variables declared in the class of which the obj is an instance, have not been assigned a value, those will not be returned in the array.
geologists call such a lack of volcanic activity near a subduction zone a "magmatic null".
גאולוגים מכנים היעדר פעילות געשית מסוג זה בסמוך לאזור הפחתה "אַיִן מגמטי" (magmatic null).