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The solution is yet another stage in abstraction: you move the function suite from the original file and place it into a new file with the same name as that of the package the functions belong to In Perl, this process is called creating a new module Each script that wants to use the functions defined in the module can import them and use them just like the functions that Perl has built in You import the functions from a module with the use command The examples of use you have seen up to now are all importing modules and promoting code reuse In this chapter, we ll be looking at how to create new functions for use within your Perl scripts and how to group functions and variables to create new packages Then we ll examine how to convert a package into a module before moving on to the differences between the available methods for importing and using packages and modules within your scripts

59 Given the following method signatures from ArrayList:

A function is a named code block that is generally intended to process specified input values into an output value, although this is not always the case For example, the print function takes variables and static text and prints the values on the screen You can define functions anywhere within a program, including importing them from external files or having them generated on the fly using an eval statement Furthermore, you can generate anonymous subroutines, which are functions that are attached, by reference, to a variable This enables you to treat a subroutine as any other entity within Perl, even though you may consider it to be a fundamental part of the blocks that make up the Perl language

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The two terms function and subroutine are used interchangeably in Perl If you want to be strict on the semantics, small pieces of named blocks of code that accept arguments and return values are called subroutines The built-in subroutines in Perl are usually referred to as Perl s functions, because they provide additional functionality A subroutine created as part of a class definition is called a method see 10 for more information In truth, there s not a lot between subroutines and functions, although personally I prefer the latter

Subroutines, like variables, can be declared (without defining what they do) or declared and defined To simply declare a subroutine, you use one of the following forms:

EXIF is a standard for storing descriptive metadata in image files, particularly JPEG and TIFF files The format is commonly used by digital camera vendors to embed descriptive information in the headers of digital photos PHP s exif_read_data() function can read these headers and extract the information stored within them The previous listing illustrates the process A common application of PHP s EXIF support involves extracting an image thumbnail from the EXIF metadata in a digital photo, and using this thumbnail in a Web-based image gallery to preview the actual image This can be easily accomplished with the exif_thumbnail() function, illustrated here:

where NAME is the name of the subroutine you are creating, PROTO is the prototype for the arguments the subroutine should expect when called, and ATTRS is a list of attributes that the subroutine exhibits The PROTO and ATTRS arguments are optional we ll be discussing these elements separately in the Prototypes and Attributes sections later in this chapter An undefined subroutine does nothing, but it does let the rest of the script know that such a subroutine exists When used in combination with prototypes, it allows calls to subroutines to be checked However, declaring subroutines without actually defining them is not required we do not need to tell Perl the names of the subroutines we expect to create If you want to declare and define a function, then you need to include the BLOCK that defines its operation:

boolean add(E e) protected void removeRange(int fromIndexInclusive, int toIndexExclusive) int size()

You can also create anonymous subroutines subroutines without a name by omitting the NAME component:

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