в 10:37, 26 мая 2010

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2010-05-26T07:05:39Z

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==IsSet variable==



<source lang="html4strict">

<?
$MyVar="Hello there!";

If(IsSet($MyVar))
echo "The variable is set. Its value is $MyVar";
?>

</source>

==The isset() Function==



<source lang="html4strict">
<html>
<head>
<title>Isset()</title>
</head>
<body>
<?php
$my_var = 100;

if(isset($my_var)) {
print("\$my_var is set... the value is " . $my_var);
}

print(" ");
print(isset($some_var) . " ");

$some_var = "I am set";
print(isset($some_var) . " ");
?>
</body>
</html>

</source>

==UnSet array element==



<source lang="html4strict">

<?
$A=array(0=>"zzzz",
"a"=>"aaa",
"b"=>"bbb",
"c"=>"ccc");
Unset($A["a"]);
echo $A["a"]
?>

</source>

==unset() Function==



<source lang="html4strict">
<html>
<head>
<title>Unset()</title>
</head>
<body>
<?php
$authorJ = "A";
$authorC = "B";
$jeremy = &$authorJ;
$charlie = &$authorC;

print("$authorJ ");
unset($jeremy);
print($authorJ . " or " . $jeremy . " ");

print("$authorC ");
unset($charlie);
unset($authorC);
print($authorC);
?>
</body>
</html>

</source>

==Unset variable==



<source lang="html4strict">

<?
$a="Hello there!";
echo $a
unset($a);
echo $a; // Error: there is no variable $a
?>

</source>

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