#test.php

<?php
$t = 5;
$t = $t+5;
$t += 5;

$t = $t+1;
$t += 1;
$t++;
++$t;

$x = 5;
$y = $x++;

echo '<br/>'.$x.'-'.$y;//6 - 5
$t = ++$x;//$x = 7, $t = 7
echo '<br/>'.$x.'-'.$t;

//$x = 7, $y = 5, $t = 7
//$k = 7 (x=8) + (t=8) 8 + (x=9) 9 - (y=4) 4 = 25
$k = $x++ + ++$t + ++$x - --$y + 5;
echo '<br/>'.$x.'-'.$y.'-'.$t.'-'.$k;

$x2 = 6;
$x1 = ($x2 == 9)?'HELLO':'GOODBYE';
echo '<br/>'.$x1;

#test2.php

<?php
$number = 1;

while ($number <= 10) {
	echo '<br/>'.$number;
	$step   = 2;
	$number = $number.$step;//$number = 12
}

#vidu.php

<?php
require_once ('vidu1.php');//include_one
require_once ('vidu1.php');
require_once ('vidu1.php');
//require <=> include
//Khai bao 1 mang - du lieu rong
//cach 1
$arr = array();
//cach 2
$arr = [];

//them 1 phan tu vao trong mang
$arr[] = 12;//mang trong PHP -> luu nhieu loai du lieu khac nhau
$arr[] = 'ABC';

array_push($arr, 'OKOK');

var_dump($arr);
//count($arr) => tra ve so phan tu trong mang
for ($i = 0; $i < count($arr); $i++) {
	echo '<br/>'.$arr[$i];
}

//cach 2 => duyet qua cac phan tu
foreach ($arr as $value) {
	echo '<br/>'.$value;
}

//remove 1 phan tu trong mang
// unset($arr[1]);
//array_splice($mang, $index, $so_phan_tu_can_xoa)
array_splice($arr, 1, 1);
var_dump($arr);

echo '<br/>So phan tu trong mang: '.count($arr);
for ($i = 0; $i < count($arr); $i++) {
	echo '<br/>'.$arr[$i];
}

foreach ($arr as $value) {
	echo '<br/>'.$value;
}

//Khai bao 1 mang co chua phan tu truoc
$arr = array('12', 'okok', 3, 7, 10);
$arr = ['item 1', 'item 2', 'item 3'];
//them, xoa phan tu nhu tren
//sua 1 phan tu tai vi tri index
$arr[1] = 'edit item 2';
foreach ($arr as $value) {
	echo '<br/>'.$value;
}

//Hashmap : key => value
//khai bao 1 mang rong
$arr             = [];
$arr['fullname'] = 'TRAN VAN DIEP';
$arr['age']      = '35';
$arr['address']  = 'Nam Dinh';

var_dump($arr);

foreach ($arr as $key => $value) {
	echo '<br/>'.$arr[$key];
}

//Khi lay gia tri 1 phan tu trong mang => can biet key can lay
//fullname
echo '<br/>'.$arr['fullname'];

//khai bao lồng mang.
$studentList = [
	[
		'fullname' => 'A',
		'age'      => 18,
		'address'  => 'Ha Noi'
	], [
		'fullname' => 'B',
		'age'      => 19,
		'address'  => 'Ha Noi'
	], [
		'fullname' => 'C',
		'age'      => 22,
		'address'  => 'Ha Noi'
	]
];

$studentList[] = [
	'fullname' => 'D',
	'age'      => 28,
	'address'  => 'Ha Noi'
];

foreach ($studentList as $std) {
	echo '<br/>'.$std['fullname'].'-'.$std['age'];
}

//=================== Chu y
//$_GET, $_POST => $_REQUEST
//$_COOKIE, $_SESSION, $_SERVER
var_dump($_SERVER);

#vidu1.php

<?php
// define('BASE_URL', 'https://gokisoft.com');

// echo BASE_URL;

// const API_STUDENT_LIST = '/api/student/list';

// echo API_STUDENT_LIST;
echo '<br/>TEST';