Um Arrayelemente innerhalb der Schleife direkt verändern zu können, muss dem Variablennamen $value ein&vorangestellt werden.
In order to be able to directly modify array elements within the loop precede $value with&. In that case the value will be assigned by reference.
SafeArray wird als safe (sicher) bezeichnet, da dieser Datentyp Informationen zu den Grenzen der einzelnen Arraydimensionen enthält und den Zugriff auf die Arrayelemente innerhalb dieser Grenzen beschränkt.
A SafeArray is called safe because it contains information about the bounds of each array dimension, and limits access to array elements within those bounds.
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