It works!
namespace Library;
";
//1.数据类型
$bool = true;
$bool2 = false;
$a = 3.14;
$char1 = "双引号字符串";
$char2 ='单引号字符串';
//单引号和双引号在变量表示和字符的转义有区别
echo "$char1"."
"."$char2
";
echo "检测变量的类型使用函数";
$ais = NULL;
echo "检查是否为空:".is_null($ais)."
";
echo "检查是否是浮点数:".is_float($a)."
";
// s_file()
// is_array()
// is_string(var)
$ais = "string";
echo "检查是否是字符串:".is_float($ais)."
"; //在我这里条件为假的时候不打印信息，为真的时候打印0；
if (!is_float($ais)) {
echo "不是字符串
";
}
//可以将变量的值作为一个变量的名称，这里竟然是可变变量
$txt = 'abc';
$$txt = "hello"; //等于 $abc = 'hello';
echo "验证可变变量:$abc = hello
";
//变量类型的转换。phpc存在自动类型的变量转换，
$a = 0;
$b = 0.0;
$c ="";
$d = "0";
$e = array();//数组类型
$f = NULL;
//这个判断两个条件竟然都不执行
if ($a==false&&$b==false&&$c==false&&$d==false&&$e==false&&$f==false) {
echo '都真的是false
';
}
$b = $a + 1;
var_dump($b);//dump能够打印出类型
$a = 1 + "-1.5e2";
echo "
字符和整数相加:$a
";
$a = true+1;
echo "bool转换$a
";
//转换字符串类型
$a = ture ;
$b =3 ;
$c = 5.5;
$d = $a. 'string'.$b.$c;
var_dump($d);
//强制类型转换 -- （类型）变量
$num = 10.00;//10.00 是字串10
var_dump((string)$num);
$a;$b;$c;//逗号不行
$a=$b=$c =10;
echo "$a$b$c
";
//流程语句
switch ($a) {
case 1:
echo "---1";
break;
case 10:
echo "====$a";
break;
default:
break;
}
for ($i=0; $i <10 ; $i++) {
echo "$i.";
}
echo "
";
//替换语法,括号换成冒号--endfor
for ($i=0; $i < 5; $i++):
echo "$i";
endfor;
//-----函数定义
function call($name)
{
echo "你好，我是$name
";
}
call("王国栋");
function add($one,$two)
{
return $one + $two;
}
echo add(2,3);
//echo add(2,3);
$var = 100;
function testone (){
global $var;
echo "全局变量的值是：$var";
echo $GLOBALS['var']."
";
}
testone();
//可变函数
$aliasTestOne = "testone";
$aliasTestOne();
//字符串相关的函数
$str = "apple,pear,banana,orange";
$arr = explode(",", $str);
print_r($arr);
$arrayName = array("apple","pear","bananer");
echo implode("&", $arrayName);
//strcmp和==比较字符串一样，但是结果正好相反
//trim strlen 函数
//时间戳
echo "
";
//mktime 函数有许多参数
echo date("Y-m-d:H-i-s",mktime());//当前的时间，但是不准确
/*
mktime加参数出错
*/
echo "
";
echo date("Y-m-d:H-i-s",mktime(14,28,56,4,10,2013));//当前的时间，但是不准确
echo "
";
//设置时区
date_default_timezone_set("Asia/Shanghai");
echo date("Y-m-d H-i-s",time());
//输出明天时间点,
echo "
".date("Y-m-d H-i-s",strtotime("+1 day"));;
function microtime_float(){
list($usec,$sec) = explode(" ", microtime());
return ((float)$usec+(float)$sec);
}
$time_start = microtime_float();
usleep(1000);
$time_end = microtime_float();
$time = $time_end - $time_start;
echo "执行时间是 $time"
;
function appleNumber($n)
{
if (1==$n) {
return (1+1)*2;
}
else
{
return 2*(appleNumber($n-1)+1);
}
}
echo "
桃子的个数是:".appleNumber(3);
//数组
$arr = array('key' => "name",'key2'=> "name2");//打印数组
print_r($arr);
var_dump($arr);//可以输出类型
$arridx[0]=123;
$arridx[1]=124;
$arridx[2]='hello';
echo "删除前:";
print_r($arridx);
echo "删除后:";
unset($arridx[1]);
print_r($arridx);
$arrone = array('a' => "abc",'b' => 'bcd' );
$arrtwo = array('a' => "cde", 'd' =>'def');
$c = $arrone + $arrtwo;
var_dump($c);
echo "each函数的用法:-------
";
$shuzu = array('one' => 'ONE','two','Three'=>'3','four',5);
print_r(each($shuzu));
print_r(each($shuzu));
echo "数组遍历\n";
foreach ($shuzu as $key => $value) {
echo "$key";
echo "=>";
echo "$value";
echo "\n";
}
//foreache 和list each遍历数组
$dict = array('os' => "linux",'server' =>'Apache','language'=>'Php','database'=>'MySql');
while (list($key,$value)=each($dict)) {
echo "$key=>$value\n";
}
$sort = array(9,8,10,2,4);
function bubbleSort($array)
{
for ($i=0; $i $array[$j+1]) {
$t = $array[$j];
$array[$j] = $array[$j+1];
$array[$j+1] = $t;
}
}
}
print_r($array);
}
bubbleSort($sort);
$arrfunc = array(1,2,2,4,5);
is_array($arrfunc);
print_r(array_unique($arrfunc));
echo array_search('Apache', $dict);
$array = array(1,2,3,11,'11');
print_r(array_keys($array));
print_r(array_keys($array,"11",false));//查找11不依赖类型
sort($array,SORT_NUMERIC);
print_r($array);
echo "
";
/**
*
*/
class Person
{
public $name;
public $age;
function __construct($name,$age)
{
if ($name==NULL) {
$name = "def";
}
if ($age==NULL) {
$age = 10;
}
$this->name = $name;
$this->age = $age;
}
public function speak(){
echo "大家好，我叫".$this->name."今年".$this->age."岁\n";//this 不调用get方法
}
public function __get($property_name)
{
echo "自动调用__get方法获取属性\n";
if (isset($this->$property_name)) {
return ($this->$property_name);
}
else
{
return (NULL);
}
}
public function __set($property_name,$value)
{
echo "自动调用set方法\n";
$this->$property_name = $value;
}
//析构函数
function __destruct()
{
echo "对象被销毁";
}
}
//--------------------------------这里需要看下，在定义construct方法后，这样不行
// $me = new Person();
// $me->name = "guodong";
// $me->age = 10;
// $me->speak();
// echo "$me->name";// 这里会调用get方法
$me2 = new Person("xiaowang","25");
$me2->speak();
//echo Person::PI;
//
/**
*
*/
class MathTool
{
const PI = 3.14;
static $schoolName = "php学院";//对象共享
function show ()
{
echo self::PI;
echo MathTool::$schoolName;//---少了$
echo "\n";
//echo MathTool::PI;
}
//类方法
public static function classMethod()
{
echo "这相当于oc里面的类方法\n";
}
}
$stu1 = new MathTool();
$stu2 = new MathTool();
$stu2->show();
$stu1->show();
MathTool::classMethod();
/**
*
*/
final class superMathTool extends MathTool //禁止其他类继承
{
final function show()
{
echo "子类重写父类方法";
}
}
$math = new superMathTool();
$math->show();
abstract class Animail //抽象类，可以包含非抽象方法
{
abstract function shout();
}
/**
*
*/
class Dog extends Animail
{
function shout()
{
echo "\n汪汪汪\n";
}
}
(new Dog())->shout();
//--接口。类似于OC，
interface Animail2
//抽象类，可以包含非抽象方法,没有class关键字
//
{
function shout();//这里也没有abstract
}
class Dog2 implements Animail2
{
function shout()
{
echo "\n汪汪汪\n";
}
}
(new Dog2())->shout();
//一个类可以实现多个接口，和OC一样
//错误处理
ini_set('display_errors', 1);
$rand_num = mt_rand(0,1);
if ($rand_num==0) {
error_reporting(E_ALL);
}
else
{
error_reporting(E_ALLE_NOTICE);
}
echo $info;
?>
