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==Defining Variable Scope==



<source lang="html4strict">

<?php
$a = 7;
function test() {
$a = 20;
}
test();
echo "\$a = $a\n";
?>

</source>

==local variables==



<source lang="html4strict">

<?php
$x = 4;
function assignx () {
$x = 0;
print "\ $x inside function is $x. <br>";
}
assignx();
print "\ $x outside of function is $x. <br>";

?>

</source>

==More Working with Variable Scope==



<source lang="html4strict">

<?php
function getglobal() {
global $my_global;
echo "The value of \$foobar is "$foobar"<BR>";
}
$my_global = 20;
getglobal();
?>

</source>

==Scope of a Variable==



<source lang="html4strict">

<?php
$a = "asdf";
function music (){
$a = "Music is great";
}
print $a;
?>

</source>

==Use variable defined outside function==



<source lang="html4strict">

<?php
$ilike = "Rock";
function music(){
echo "I love listening to $ilike music!", "\n";
}
music();
?>

</source>

==Variable Scope==



<source lang="html4strict">

<?php
$num;
function make_triple($arg)
{
global $num;
$num = $arg + $arg +$arg;
thrice();
}
function thrice()
{
global $num;
echo("The value is $num");
}
?>
<html>
<head>
<title>Variable Scope</title>
</head>
<body>
<h3> <?php make_triple(4); ?> </h3>
</body>
</html>

</source>

==Variable Scope: A Variable Declared Within a Function Is Unavailable Outside the Function==



<source lang="html4strict">

<html>
<head>
<title>Local Variable Unavailable Outside a Function</title>
</head>
<body>
<div>
<?php
function test() {
$testvariable = "this is a test variable";
}
print "test variable: $testvariable<br/>";
?>
</div>
</body>
</html>

</source>

==Variable scope: function==



<source lang="html4strict">
<?php
increment ();
increment ();
increment ();
function increment () {
$a=0;
echo $a;
$a++;
}
?>

</source>

==Variable Scope in Functions==



<source lang="html4strict">

function foo( ) {
$bar = "wombat";
}
$bar = "baz";
foo( );
print $bar;

</source>

==Variables Defined Outside Functions Are Inaccessible from Within a Function by Default==



<source lang="html4strict">

<html>
<head>
<title>Variables Defined Outside Functions Are Inaccessible from Within a Function by Default</title>
</head>
<body>
<?php
$life = 42;
function meaningOfLife(){
print "The meaning of life is $life<br>";
}
meaningOfLife();
?>
</body>
</html>

</source>

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в 10:37, 26 мая 2010

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