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How can I easily detect when a variable changes value? I would like the execution of the program to break on the debugger whenever a specified variable changes value. Right now I'm using Eclipse's debugger.
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When you reassign a variable to another value, it simply changes the reference to that new value and becomes bound to it.
Remember that a variable holds a value and that value can change or vary.
The isset() function checks whether a variable is set, which means that it has to be declared and is not NULL. This function returns true if the variable exists and is not NULL, otherwise it returns false.
Answer: Use the typeof operator If you want to check whether a variable has been initialized or defined (i.e. test whether a variable has been declared and assigned a value) you can use the typeof operator.
For a class or instance variable
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OR Toggle Breakpoint on the line where the variable is declared, then right-click on the resulting entry, select "breakpoint properties" and deselect "Field Access".
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