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CHAPTER 9 • STRINGS AND REGULAR EXPRESSIONSwww.it-ebooks.infoCharacter n appears 6 timesCharacter o appears 1 timesCharacter p appears 2 timesCharacter r appears 1 timesCharacter s appears 1 timesCharacter t appears 1 timesCharacter y appears 1 timesCounting the Total Number of Words in a StringThe function str_word_count() offers information regarding the total number of words found in a string.Its prototype follows:mixed str_word_count(string str [, int format])If the optional parameter format is not defined, it will return the total number of words. If format isdefined, it modifies the function’s behavior based on its value:1: Returns an array consisting of all words located in str.2: Returns an associative array where the key is the numerical position of the wordin str and the value is the word itself.Consider an example:
www.it-ebooks.infoCHAPTER 9 • STRINGS AND REGULAR EXPRESSIONS$frequency = array_count_values($words);print_r($frequency);?>This returns the following:Array ( [In] => 1 [the] => 3 [latest] => 1 [installment] => 1 [of] => 1[ongoing] => 1 [Developer] => 1 [com] => 1 [<strong>PHP</strong>] => 2 [series] => 1[I] => 1 [discuss] => 1 [many] => 1 [improvements] => 1 [and] => 1[additions] => 1 [to] => 1 [s] => 1 [object-oriented] => 1[architecture] => 1 )Taking Advantage of PEAR: Validate_USRegardless of whether your web application is intended for use in banking, medical, IT, retail, or someother industry, chances are that certain data elements will be commonplace. For instance, it’sconceivable you’ll be tasked with inputting and validating a telephone number or a state abbreviation,regardless of whether you’re dealing with a client, a patient, a staff member, or a customer. Suchrepeatability certainly presents the opportunity to create a library that is capable of handling suchmatters, regardless of the application. Indeed, because we’re faced with such repeatable tasks, it followsthat other programmers are, too. Therefore, it’s always prudent to investigate whether somebody hasalready done the hard work for you and made a package available via PEAR.■ Note If you’re unfamiliar with PEAR, take some time to review Chapter 11 before continuing.Sure enough, a quick PEAR search turns up Validate_US, a package that is capable of validatingvarious informational items specific to the United States. Although still in beta at press time,Validate_US was already capable of syntactically validating phone numbers, SSNs, state abbreviations,and ZIP codes. This section shows you how to install and implement this immensely useful package.Installing Validate_USTo take advantage of Validate_US, you need to install it. The process for doing so follows:%>pear install Validate_US-betadownloading Validate_US-0.5.3.tgz ...Starting to download Validate_US-0.5.3.tgz (7,834 bytes).....done: 7,834 bytesinstall ok: channel://pear.php.<strong>net</strong>/Validate_US-0.5.3227
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www.it-ebooks.infoBeginning PHP and
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www.it-ebooks.infoAbout the Author
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www.it-ebooks.info•Acknowledgment
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www.it-ebooks.info• INTRODUCTIONC
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www.it-ebooks.infoC H A P T E R 1
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www.it-ebooks.infoCHAPTER 3 • PHP
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