в 10:37, 26 мая 2010

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2010-05-26T07:03:07Z

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==Deleting an object==



<source lang="html4strict">

class car {
function __destruct() {
// head to car dealer
}
}
$car = new car;
unset($car);

</source>

==Removing Elements==



<source lang="html4strict">

<?php

$dogs = array("A" => "AA", "Bud" => "BB","C" => "CC");
printf("<pre>%s</pre>\n", var_export($dogs, TRUE));
unset($dogs["C"]);
printf("<pre>%s</pre>\n", var_export($dogs, TRUE));
?>

</source>

==Removing Elements from Arrays==



<source lang="html4strict">

<?php
$dogs = array("A" => "C", "B" => "D","X" => "Y", "Q" => "T");
printf("%s,", var_export($dogs, TRUE));
unset($dogs["X"]);
printf("%s,", var_export($dogs, TRUE));
?>

</source>

==Removing Session Data==



<source lang="html4strict">

<?
$_SESSION["foo"] = "bar";
print $_SESSION["foo"];
unset($_SESSION["foo"]);
?>

</source>

==Using the unset() Function==



<source lang="html4strict">

<?php
$myvar = "This is a string";
unset($myvar); // Destroy the variable
?>

</source>

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



<source lang="html4strict">

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.

</source>

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в 10:37, 26 мая 2010

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