The array_walk() function runs each array element in a user-made function. The array's keys and
values are parameters in the function. Returns True or False
Hint: You can assign one parameter to the function, or as many as you like.
Note: You can change an array element's value in the user-made function by specifying the
first parameter as a reference: &$value. (See Example)
The output of the code above will be:
With a parameter:
Change an array element's value. (Notice the &$value)
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