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PHP in a Nutshell
book

PHP in a Nutshell

by Paul Hudson
October 2005
Intermediate to advanced content levelIntermediate to advanced
372 pages
11h 35m
English
O'Reilly Media, Inc.
Content preview from PHP in a Nutshell

Infinite Loops

Perhaps surprisingly, infinite loops can often be helpful in your scripts. If you are writing a program to accept people typing in data for as long as they want, it just would not work to have the script loop 30,000 times or even 30,000,000 times. Instead, the code should loop forever, constantly accepting user input until the user ends the program by pressing Ctrl-C.

Here are the two most common types of infinite loops:

    <?php
            while(1) {
                    print "In loop!\n";
            }
    ?>

As "1" also evaluates to true, that loop will continue on forever.

    <?php
            for (;;) {
                    print "In loop!\n";
            }
    ?>

In that example, the for loop is missing the declaration, condition, and action parts, meaning that it will always loop.

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Publisher Resources

ISBN: 0596100671Errata Page