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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

Name

unset()

Synopsis

    void unset ( mixed var [, mixed var [, mixed ...]] )

The unset() function deletes a variable so that isset() will return false. Once deleted, you can recreate a variable later on in a script.

    $name = "Paul";
    if (isset($name)) print "Name is set\n";
    unset($name);
    if (isset($name)) print "Name is still set\n";

That would print out "Name is set", but not "Name is still set", because calling unset() has deleted the $name variable.

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Publisher Resources

ISBN: 0596100671Errata Page