print “hello world”
<html>
<head>
<title>Leap Years</title>
</head>
<body>
<?php
echo "hello world";
echo "hello" . " " . "haifei";// . 连接符
?>
</body>
</html>
注释
// 单行注释
/* 多行注释 */
定义变量
php不区分类型，直接赋值
$name = "tony";
$age = 18;
数组
取值 [] 等同{}
$language = array("php", "java", "ruby","python");
echo $language[2];
echo $language{2};
$language{2} = "go";
echo $language[2];
$myAssocArray = array('year' => 2012,
'colour' => 'blue',
'doors' => 5);
echo $myAssocArray['colour'];//blue
if else
$value = 3;
if($value == 1){
echo "value is one";
}else if($value == 2){
echo "value is two";
}else{
echo "echo else";
}
switch
//写法1
$var = 2;
switch($var){
case 1:
break;
case 2:
break;
default:
break;
}
//写法2
$var = 2;
switch($var):
case 1:
break;
case 2:
break;
default:
break;
endswitch;
for
for($leap = 2000; $leap<2050; $leap+=4){
echo " $leap ";
}
foreach
$arr = array("a","b","c");
foreach($arr as $a){
echo $a;
}
while
$loopCount = 0;
while ($loopCount<4){
echo "<p>Iteration number: {$loopCount}</p>";
$loopCount ++;
}
while ($loopCount<4):
echo "<p>Iteration number: {$loopCount}</p>";
$loopCount ++;
endwhile;
do while
$i = 0;
do {
echo $i;
} while ($i > 0);
功能函数
字符串操作
$name = "HaiFei";
print strlen("david");//长度
$sub = substr($name,0,3);//字符串截取
print $sub;
print strtoupper($name);//大写
print strtolower($name);//小写
print strpos($name, "a");//位置
if(strpos($name,"z") === false){//是恒等计算符 同时检查表达式的值与类型
print "sorry not found";
}
取整，四舍五入
$round = round(M_PI);
print $round; // prints 3
// This time, round pi to 4 places
$round_decimal = round(M_PI, 4);
print $round_decimal; // prints 3.1416
随机数
// prints a number between 0 and 32767
print rand();
// prints a number between 1 and 10
print rand(1,10);
数组操作
$arr = array();
array_push($arr,"11");
array_push($arr,"22");
print count($arr);// 2
$array = array(5, 3, 7, 1);
sort($array);
print join(", ", $array);// prints "1, 3, 5, 7"
rsort($array);
print join(":", $array);// prints "7:5:3:1"
函数
function aboutMe($name, $age){
echo "Hello! My name is $name, and I am $age years old";
}
aboutMe("haifei", 18);
类
// The code below creates the class
class Person {
// Creating some properties (variables tied to an object)
public $isAlive = true;
public $firstname;
public $lastname;
public $age;
// Assigning the values
public function __construct($firstname, $lastname, $age) {
$this->firstname = $firstname;
$this->lastname = $lastname;
$this->age = $age;
}
// Creating a method (function tied to an object)
public function greet() {
return "Hello, my name is " . $this->firstname . " " . $this->lastname . ". Nice to meet you! :-)";
}
}
// Creating a new person called "boring 12345", who is 12345 years old ;-)
$me = new Person('boring', '12345', 12345);
// Printing out, what the greet method returns
echo $me->greet();
class Person {
public $isAlive = true;
function __construct($name) {
$this->name = $name;
}
public function dance() {
return "I'm dancing!";
}
}
$me = new Person("Shane");
if (is_a($me, "Person")) {
echo "I'm a person, ";
}
if (property_exists($me, "name")) {
echo "I have a name, ";
}
if (method_exists($me, "dance")) {
echo "and I know how to dance!";
}
const , static关键字
class Ninja extends Person {
const stealth = "MAXINUM";// 没有 $
static public $job = "coder";
static public function proclaim() {
return "A kingly proclamation!";
}
}
echo Ninja::stealth;
echo Ninja::$job;
echo Ninja::proclaim();
map
$myArray = array('name'=>'haifei',
'age'=> 18,
'address'=>"beijing");
foreach($myArray as $key=>$value){
echo $key . ":" . $value . " ";
}
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