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In page PHP:
"The visibility of PHP properties and methods is defined using the keywords
public,private, andprotected. The default is public, if only var is used;varis a synonym forpublic. Items declaredpubliccan be accessed everywhere.protectedlimits access to inherited classes (and to the class that defines the item).privatelimits visibility only to the class that defines the item.[5] Objects of the same type have access to each other's private and protected members even though they are not the same instance.[citation needed]
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