Creates an anonymous function from the parameters passed, and returns a unique name for it.
Usually these parameters will be passed as single quote delimited strings. The reason for using single quoted strings, is to protect the variable names from parsing, otherwise, if you use double quotes there will be a need to escape the variable names, e.g. \$avar.
args
The function arguments.
code
The function code.
Or, perhaps to have general handler function that can apply a set of operations to a list of parameters:
例 2. Making a general processing function with create_function()
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But perhaps the most common use for of lambda-style (anonymous) functions is to create callback functions, for example when using array_walk() or usort()
例 3. Using anonymous functions as callback functions
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an array of strings ordered from shorter to longer
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sort it from longer to shorter
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