PHP static method variable scope
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Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?
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Question About Static Methods
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When to use static modifier in PHP
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PHP class: Global variable as property in class
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Objective-C Static Class Level variables
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Java Static and Dynamic Binding, Overloading
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Pointers to static methods in Python
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How do I examine defined constants in PHP?
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php oop is there way to automatically set this variables
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static variables in an inlined function
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When are static variables initialized?
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USING $THIS in PHP
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When to use static member function?
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Why are global and static variables initialized to their default values?
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Global Variables for Class Methods
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Variable scoping in Module
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How does one access a control from a static method?