A free and open-source book on Zend Framework for beginners


Watching Variables

When the PHP interpreter is paused, you can conveniently watch the values of PHP variables. A simple way to browse a variable is just positioning the mouse cursor over the variable name inside of the code and waiting for a second. If the variable value can be evaluated, it will be displayed inside of a small pop up window.

Another way to watch variables is through the Variables window (shown in figure B.10), which is displayed in the bottom part of NetBeans window. The Variables window has three columns: Name, Type and Value.

Figure B.10. Variables window Figure B.10. Variables window

Mainly, you will be faced with three kinds of variables: super globals, locals and $this:

Some variables can be "expanded" (to expand a variable, you need to click on a triangle icon to the left of variable's name). For example, by clicking and expanding $this variable, you can watch all fields of the class instance. If you expand an array variable, you will be able to watch array items.

Using the Variables window it is possible not only to watch variable's value, but also to change the value on the fly. To do that, place your mouse cursor over the value column and click over it. The edit box appears, where you can set the new value of the variable.


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