PHP kezdőknek és haladóknak

A $_SERVER tömb kilistázása ciklussal

<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>Listing 10.1 Looping through the $_SERVER array</title>
</head>
<body>
<div>
<?php
foreach ( $_SERVER as $key=>$value ) {
print "\$_SERVER[\"$key\"] == $value<br/>";
}
?>
</div>
</body>
</html>

Eredmény:
$_SERVER["ALLUSERSPROFILE"] == C:\ProgramData
$_SERVER["APPDATA"] == C:\Users\G?bor\AppData\Roaming
$_SERVER["CommonProgramFiles"] == C:\Program Files (x86)\Common Files
$_SERVER["CommonProgramFiles(x86)"] == C:\Program Files (x86)\Common Files
$_SERVER["CommonProgramW6432"] == C:\Program Files\Common Files
$_SERVER["COMPUTERNAME"] == GABOR-PC
$_SERVER["ComSpec"] == C:\Windows\system32\cmd.exe
$_SERVER["FP_NO_HOST_CHECK"] == NO
$_SERVER["HOMEDRIVE"] == C:
$_SERVER["HOMEPATH"] == \Users\G?bor
$_SERVER["LOCALAPPDATA"] == C:\Users\G?bor\AppData\Local
$_SERVER["LOGONSERVER"] == \\GABOR-PC
$_SERVER["NB_EXEC_EXTEXECUTION_PROCESS_UUID"] == 2acf59eb-c72b-49b8-9f76-88308c4fcb17
$_SERVER["NUMBER_OF_PROCESSORS"] == 2
$_SERVER["OS"] == Windows_NT
$_SERVER["Path"] == C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;e:\Program Files (x86)\AOMEI Backupper Professional Edition 2.0;C:\Program Files\jEdit
$_SERVER["PATHEXT"] == .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
$_SERVER["PROCESSOR_ARCHITECTURE"] == x86
$_SERVER["PROCESSOR_ARCHITEW6432"] == AMD64
$_SERVER["PROCESSOR_IDENTIFIER"] == AMD64 Family 15 Model 107 Stepping 2, AuthenticAMD
$_SERVER["PROCESSOR_LEVEL"] == 15
$_SERVER["PROCESSOR_REVISION"] == 6b02
$_SERVER["ProgramData"] == C:\ProgramData
$_SERVER["ProgramFiles"] == C:\Program Files (x86)
$_SERVER["ProgramFiles(x86)"] == C:\Program Files (x86)
$_SERVER["ProgramW6432"] == C:\Program Files
$_SERVER["PSModulePath"] == C:\Windows\system32\WindowsPowerShell\v1.0\Modules\
$_SERVER["PUBLIC"] == C:\Users\Public
$_SERVER["SESSIONNAME"] == Console
$_SERVER["SystemDrive"] == C:
$_SERVER["SystemRoot"] == C:\Windows
$_SERVER["TEMP"] == C:\Users\GBOR~1\AppData\Local\Temp
$_SERVER["TMP"] == C:\Users\GBOR~1\AppData\Local\Temp
$_SERVER["USERDOMAIN"] == Gabor-PC
$_SERVER["USERNAME"] == G?bor
$_SERVER["USERPROFILE"] == C:\Users\G?bor
$_SERVER["windir"] == C:\Windows
$_SERVER["windows_tracing_flags"] == 3
$_SERVER["windows_tracing_logfile"] == C:\BVTBin\Tests\installpackage\csilogfile.log
$_SERVER["PHP_SELF"] == E:\STY PHP in 24 Hours\Hour 10\listing10.01.php
$_SERVER["SCRIPT_NAME"] == E:\STY PHP in 24 Hours\Hour 10\listing10.01.php
$_SERVER["SCRIPT_FILENAME"] == E:\STY PHP in 24 Hours\Hour 10\listing10.01.php
$_SERVER["PATH_TRANSLATED"] == E:\STY PHP in 24 Hours\Hour 10\listing10.01.php
$_SERVER["DOCUMENT_ROOT"] ==
$_SERVER["REQUEST_TIME_FLOAT"] == 1410773489.2432
$_SERVER["REQUEST_TIME"] == 1410773489
Notice: Array to string conversion in E:\STY PHP in 24 Hours\Hour 10\listing10.01.php on line 12 $_SERVER["argv"] == Array
$_SERVER["argc"] == 1

9. fejezet gyakorlat megoldása: származtatott függvények

<?php
class Szamolo {

function Szamolo( $egyik=2, $masik=3 ) {
$this->egyik = $egyik;
$this->masik = $masik;
}

function kiszamol() {
print $this->egyik.", ".$this->masik;
}
}

class Osszead extends Szamolo {
function kiszamol() {
print $this->egyik+$this->masik;
}
}

class Kivon extends Szamolo {
function kiszamol() {
print $this->egyik-$this->masik;
}
}

//ellenőrzés
$teszt = new Szamolo( 5,6 );
$teszt->kiszamol();
print "<BR \>";

$teszt1 = new Osszead( 5,6 );
$teszt1->kiszamol();
print "<BR \>";

$teszt2 = new Kivon( 5,6 );
$teszt2->kiszamol();
print "<BR \>";

?>

Eredmény:
5, 6
11
-1

Konstruktorok használata

<?php
class Item {
private $name;

function __construct( $name="item", $code=0 ) {
$this->name = $name;
$this->code = $code;
}

function getName() {
return $this->name;
}
}

class PriceItem extends Item {
private $price;

function __construct( $name, $code, $price ) {
parent::__construct( $name, $code );
$this->price = $price;
}

function getName() {
return "(price) ".parent::getName();
}
}

$item = new PriceItem( "widget", 5442, 5.20 );
print $item->getName();
// outputs "(price) widget"

?>

Eredmény:
(price) widget

Szülő osztály meghívása: parent

Gyermekosztály által felülírt tagfüggvény

<?php
class Item {
var $name;

function Item( $name="item", $code=0 ) {
$this->name = $name;
$this->code = $code;
}

function getName() {
return $this->name;
}
}

class PriceItem extends Item {
function getName() {
return "(price) ".$this->name;
}
}

$item = new PriceItem( "widget", 5442 );
print $item->getName();
// outputs "(price) widget"

?>

Eredmény:
(price) widget

Osztály származtatása

A származtatott osztály örökli az ős tulajdonságait és metódusait.

<?php
class Item {
var $name;

function Item( $name="item", $code=0 ) {
$this->name = $name;
$this->code = $code;
}

function getName() {
return $this->name;
}
}

class PriceItem extends Item {

}

$item = new PriceItem( "widget", 5442 );
print $item->getName();
// outputs "widget"

?>

Eredmény:
widget

Osztály nyilvános tulajdonságokkal

<?php
class Item {
var $name;
var $code;
var $productString;

function Item( $name="item", $code=0 ) {
$this->code = $code;
$this->setName( $name );
}

function getProductString() {
return $this->productString;
}

function setName( $n ) {
$this->name = $n;
$this->productString = $this->name." ".$this->code;
}

function getName() {
return $this->name;
}
}

$item = new Item("widget", 5442);
print $item->getProductString();
// outputs "widget 5442"

print "<br />";

$item->name = "widget-upgrade";
print $item->getProductString();
// outputs "widget 5442", not "widget-upgrade 5442"
// Mivel nem a setName függvénnyel állítottuk be a nevét, nem annak megfelelő lesz.
?>

Eredmény:
widget 5442
widget 5442

2014. szeptember 15., hétfő