From c0f2a89236daaa58df68a343c20311880650331b Mon Sep 17 00:00:00 2001
From: kuangweijian <867034892@qq.com>
Date: Mon, 7 Mar 2022 19:33:32 +0800
Subject: [PATCH] =?UTF-8?q?php=E5=AD=A6=E4=B9=A0=E7=AC=AC=E4=B8=80?=
 =?UTF-8?q?=E5=A4=A9:=E5=9F=BA=E6=9C=AC=E8=AF=AD=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 01基本语法/constants常量.php    | 28 +++++++++++++++++++++++++++
 01基本语法/global.php             | 24 +++++++++++++++++++++++
 01基本语法/static_variables.php   | 16 +++++++++++++++
 01基本语法/variable_variables.php | 10 ++++++++++
 01基本语法/定界符.php          | 17 ++++++++++++++++
 01基本语法/运算符.php          | 15 ++++++++++++++
 01基本语法/预定义变量.php    |  8 ++++++++
 02流程控制/break_n.php            | 26 +++++++++++++++++++++++++
 02流程控制/demo.php               |  3 +++
 02流程控制/foreach.php            | 17 ++++++++++++++++
 02流程控制/include.php            |  4 ++++
 02流程控制/include_once.php       |  5 +++++
 02流程控制/inlude2.php            |  3 +++
 02流程控制/require.php            |  4 ++++
 03函数/01参数是class.php         | 11 +++++++++++
 03函数/03可变参数.php           |  8 ++++++++
 03函数/declare.php                  |  9 +++++++++
 17 files changed, 208 insertions(+)
 create mode 100644 01基本语法/constants常量.php
 create mode 100644 01基本语法/global.php
 create mode 100644 01基本语法/static_variables.php
 create mode 100644 01基本语法/variable_variables.php
 create mode 100644 01基本语法/定界符.php
 create mode 100644 01基本语法/运算符.php
 create mode 100644 01基本语法/预定义变量.php
 create mode 100644 02流程控制/break_n.php
 create mode 100644 02流程控制/demo.php
 create mode 100644 02流程控制/foreach.php
 create mode 100644 02流程控制/include.php
 create mode 100644 02流程控制/include_once.php
 create mode 100644 02流程控制/inlude2.php
 create mode 100644 02流程控制/require.php
 create mode 100644 03函数/01参数是class.php
 create mode 100644 03函数/03可变参数.php
 create mode 100644 03函数/declare.php

diff --git a/01基本语法/constants常量.php b/01基本语法/constants常量.php
new file mode 100644
index 0000000..02032b1
--- /dev/null
+++ b/01基本语法/constants常量.php
@@ -0,0 +1,28 @@
+<?php
+    define('a','1');
+    const b=2;
+    echo a.'<br>';  //常量没有$号
+    echo b.'<br>';
+
+    //b=3;    //b是常量，不能再修改
+    //echo b;
+
+    //获取常量
+    $b='b';
+    echo constant($b).'<br>';
+
+    //判断常量是否存在
+    const c=3;
+    $d=4;
+    var_dump(defined('c')); //常量c存在，返回true
+    echo '<br>';
+    var_dump(defined('d')); //d不是常量，返回false
+    echo '<br>';
+
+    //魔术常量
+    echo "当前文件路径".__FILE__;
+
+    /*
+    感悟：php常量像C语言里的宏
+    */
+?>
\ No newline at end of file
diff --git a/01基本语法/global.php b/01基本语法/global.php
new file mode 100644
index 0000000..91665e3
--- /dev/null
+++ b/01基本语法/global.php
@@ -0,0 +1,24 @@
+<?php
+    $a=1;
+    $b=2;
+    $c=3;
+
+    function func()
+    {
+        global $a,$b;
+        echo "a：$a";       //func内使用global引用了a和b，所以c没有打印出来
+        echo "<br> b：$b";
+        echo "<br> c：$c";  
+    }
+
+    function func2()
+    {
+        echo "<br>a:".$GLOBALS['a'];    // $GLOBALS['var'] 指的是函数外部变量本身，是一个变量.在程序的任意位置都能使用
+        echo "<br>b:".$GLOBALS['b'];
+        echo "<br>c:".$GLOBALS['c'];
+    }
+
+    func();
+    echo "<br>";
+    func2();
+?>
\ No newline at end of file
diff --git a/01基本语法/static_variables.php b/01基本语法/static_variables.php
new file mode 100644
index 0000000..8d86bdf
--- /dev/null
+++ b/01基本语法/static_variables.php
@@ -0,0 +1,16 @@
+<?php
+    function func(){
+        static $a;
+        $b=0;
+        $a++;
+        $b++;
+        echo "$a $b <br>";  //每当func()结束后，静态变量a的生命周期没有结束掉，不断的在原来的数值上+1，而b的生命周期结束了，每次调用func都是0
+    }
+
+    func();
+    func();
+    func();
+    
+    echo $a;    //但是静态变量作用域和局部变量是一样的，在作用域之外是不能使用的
+?>
+
diff --git a/01基本语法/variable_variables.php b/01基本语法/variable_variables.php
new file mode 100644
index 0000000..17e3deb
--- /dev/null
+++ b/01基本语法/variable_variables.php
@@ -0,0 +1,10 @@
+<?php
+	//可变变量,有点像c语言里得宏
+    $a='hallo';
+    echo $a.'<br>';
+
+    $$a='world';    //=>${$a}='world' =>($a='hallo')=> $hallo='world'
+    echo $$a.'<br>';
+
+    echo ${$a}.'<br>';
+?>
\ No newline at end of file
diff --git a/01基本语法/定界符.php b/01基本语法/定界符.php
new file mode 100644
index 0000000..395514d
--- /dev/null
+++ b/01基本语法/定界符.php
@@ -0,0 +1,17 @@
+<?php
+    $title='php';
+    
+    $str=<<<str
+    <!DOCTYPE html>
+    <html>
+    <head>
+        <title> $title </title>
+    </head>
+    <body>
+        hello world!
+    </body>
+    </html>   
+    str;
+
+    echo $str;
+?>
\ No newline at end of file
diff --git a/01基本语法/运算符.php b/01基本语法/运算符.php
new file mode 100644
index 0000000..86c7464
--- /dev/null
+++ b/01基本语法/运算符.php
@@ -0,0 +1,15 @@
+<?php
+    //等于==和全等于===
+    $a=10;
+    $b='10';
+    if($a==$b){
+        echo 'a的值等于b的值'.'<br>';
+    }
+
+    $c=10;
+    $d=10;
+    if($c===$d)
+    {
+        echo 'c的类型和值等于d的类型和值'.'<br>';
+    }
+?>
\ No newline at end of file
diff --git a/01基本语法/预定义变量.php b/01基本语法/预定义变量.php
new file mode 100644
index 0000000..d868df3
--- /dev/null
+++ b/01基本语法/预定义变量.php
@@ -0,0 +1,8 @@
+<?php
+    //php已经设定好的变量
+
+    var_dump($GLOBALS);
+
+    echo "<pre>";
+    var_dump($_SERVER);
+?>
\ No newline at end of file
diff --git a/02流程控制/break_n.php b/02流程控制/break_n.php
new file mode 100644
index 0000000..3118bfc
--- /dev/null
+++ b/02流程控制/break_n.php
@@ -0,0 +1,26 @@
+<?php
+
+    //当i=5时跳到第三层循环
+    while(1){
+        while(1)
+        {
+            while (1) 
+            {
+                for($i=0; $i<10 ;$i++)
+                {
+                    echo $i.'<br>';
+                    if($i==5)
+                    {
+                        break 2;//跳出第2层循环，进入第三层循环；
+                    }
+                    echo "第1层循环<br>";
+                }
+                echo "第2层循环<br>";
+            }
+            echo "第3层循环<br>";
+            break;
+        }
+        echo "第4层循环<br>";
+        break;
+    }
+?>
\ No newline at end of file
diff --git a/02流程控制/demo.php b/02流程控制/demo.php
new file mode 100644
index 0000000..49c02f8
--- /dev/null
+++ b/02流程控制/demo.php
@@ -0,0 +1,3 @@
+<?php
+    echo 'hello<br>';
+?>
\ No newline at end of file
diff --git a/02流程控制/foreach.php b/02流程控制/foreach.php
new file mode 100644
index 0000000..3855139
--- /dev/null
+++ b/02流程控制/foreach.php
@@ -0,0 +1,17 @@
+<?php
+    $array=['name'=>'kwj','age'=>'30','native'=>'dongguan'];
+
+    //遍历数组值
+    foreach($array as $value){
+        echo $value;
+        echo '<br>';
+    }
+
+    echo '------<br>';
+
+    //遍历键名和键值
+    foreach($array as $key=>$value){
+        echo "$key : $value";
+        echo '<br>';
+    }
+?>
\ No newline at end of file
diff --git a/02流程控制/include.php b/02流程控制/include.php
new file mode 100644
index 0000000..4b25d55
--- /dev/null
+++ b/02流程控制/include.php
@@ -0,0 +1,4 @@
+<?php
+    include './inlude2.php';
+    echo $a;
+?>
\ No newline at end of file
diff --git a/02流程控制/include_once.php b/02流程控制/include_once.php
new file mode 100644
index 0000000..f515b57
--- /dev/null
+++ b/02流程控制/include_once.php
@@ -0,0 +1,5 @@
+<?php
+    include_once './demo.php';
+    include_once './demo.php';
+    //只会显示一行hello，因为demo.php只能被包含一次
+?>
\ No newline at end of file
diff --git a/02流程控制/inlude2.php b/02流程控制/inlude2.php
new file mode 100644
index 0000000..c68b503
--- /dev/null
+++ b/02流程控制/inlude2.php
@@ -0,0 +1,3 @@
+<?php
+    $a=1;
+?>
\ No newline at end of file
diff --git a/02流程控制/require.php b/02流程控制/require.php
new file mode 100644
index 0000000..119258b
--- /dev/null
+++ b/02流程控制/require.php
@@ -0,0 +1,4 @@
+<?php
+    require './inlude2.php';
+    echo $a;
+?>
\ No newline at end of file
diff --git a/03函数/01参数是class.php b/03函数/01参数是class.php
new file mode 100644
index 0000000..8c8716e
--- /dev/null
+++ b/03函数/01参数是class.php
@@ -0,0 +1,11 @@
+<?php
+    class C{}
+    class D extends C{}      //类D继承自类C
+    class E{}
+    functionf(C $c){
+        echo get_class($c)."\n";
+    }
+    f(new C);
+    f(new D);
+    f(new E);
+?>
\ No newline at end of file
diff --git a/03函数/03可变参数.php b/03函数/03可变参数.php
new file mode 100644
index 0000000..72cac8b
--- /dev/null
+++ b/03函数/03可变参数.php
@@ -0,0 +1,8 @@
+<?php
+    function func(...$arr){
+        print_r($arr);
+    }
+    echo '<pre>';
+    func(1,2,3);
+    func(4,5,6,7,8);
+?>
\ No newline at end of file
diff --git a/03函数/declare.php b/03函数/declare.php
new file mode 100644
index 0000000..3f03419
--- /dev/null
+++ b/03函数/declare.php
@@ -0,0 +1,9 @@
+<?php
+    declare(strict_types=1);
+    function func(int $a, int $b)
+    {
+        echo ($a + $b);
+    }
+
+    func(3.8 ,2);   //3.8是float类型，a是int，在strict_types=1不能类型转换
+?>
\ No newline at end of file