/***************************by
garcon1986********************************/
<?php
// variable name is sensitive
$var = "sjg";
$Var = "wl";
echo $var.' loves '.$Var.'<br>';
echo "$var, $Var<p>";
//naming conventions for variables
//$4site = 'not yet'; // invalid; starts with a number
$_4site = 'not yet'; // valid; starts with an underscore
$täyte = 'mansikka'; // valid; '洄 is (Extended) ASCII 228.
echo $_4site.'<br>';
echo $täyte.'<p>';
// pass the address
$ref1 = 'ref1';
$ref2 = &$ref1;
echo $ref1.'<br>'; //ref1
echo $ref2.'<br>'; //ref1
$ref2 = "My name is $ref2";
echo $ref1.'<br>'; //ref1
echo $ref2.'<p>'; //ref1
//$ref2 = &(24*7); //Invalid reference.
function test1()
{
return 25;
}
//$bar = &test(); // Invalid reference.
//global scope ;
$a1 = 1; /* global scope */
function test2()
{
$a1 = 2; // local variable
echo $a1.'<br>'; /* reference to local scope variable */
}
test2();
echo $a1.'<br>'; // global variable
//local scope
$a2 = 3;
$b2 = 4;
function Sum2(){
global $a2, $b2;
$b2 = $a2 + $b2;
}
Sum2();
echo $b2.'<p>';
//static variable
function test3(){
static $a=0;
echo $a;
$a++;
}
test3();
echo '<br>';
test3();
echo '<br>';
test3();
echo '<br>';
test3();
echo '<br>';
test3();
echo '<p>';
//global variable and static variable
function test_global_ref(){
global $obj;
$obj = &new stdClass;
}
function test_global_noref(){
global $obj;
$obj = new stdClass;
}
test_global_ref();
var_dump($obj);
echo '<br>';
test_global_noref();
var_dump($obj);
echo '<p>';
// variable variables
$a3 = 'hello';
$$a3 = 'world';
echo "$a3 ${$a3}"."<br>";
echo "$a3 $hello"."<p>";
?>
