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CHAPTER 3 • <strong>PHP</strong> BASICSwww.it-ebooks.info?>} else {echo "Sorry!";}Like all conditionals, elseif supports the elimination of bracketing when only a single statement isenclosed.The switch StatementYou can think of the switch statement as a variant of the if-else combination, often used when youneed to compare a variable against a large number of values:
www.it-ebooks.infoCHAPTER 3 • <strong>PHP</strong> BASICSThe while StatementThe while statement specifies a condition that must be met before execution of its embedded code isterminated. Its syntax is the following:while (expression) {statements}In the following example, $count is initialized to the value 1. The value of $count is then squared andoutput. The $count variable is then incremented by 1, and the loop is repeated until the value of $countreaches 5.The output looks like this:1 squared = 12 squared = 43 squared = 94 squared = 16Like all other control structures, multiple conditional expressions may also be embedded into thewhile statement. For instance, the following while block evaluates either until it reaches the end-of-fileor until five lines have been read and output:Given these conditionals, a maximum of five lines will be output from the sports.txt file, regardlessof its size.81
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www.it-ebooks.infoBeginning PHP and
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www.it-ebooks.info• CONTENTSOpeni
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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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