php学习随记一

Jun 13, 2016 pm 12:20 PM
br echo gt lt quot

php学习随记1

<?php # 1. Hello World     header("Content-type:text/html;charset=utf-8");#解决中文乱码	echo "hello world";	# 2. 变量 字符串啥的	#必须是$符号开头 用的时候也要带这个他	$a = 1;	$b = 3;	$c = $a + $b;	echo "\n$c"; #据说双引号里的变量名称会被替换成实际值	echo &#39;\n$c&#39;; #单引号还不支持转义字符!!	echo "<br>第一个换行";	echo '<br>第二个换行';	#			你好			<br>			然而并不好std;	#数组	$arr1 = array('你','好');    echo "<br>$arr1[1]";    $arr2 = array(0=>'n');    echo "<br>$arr2[0]";    #常量    define('Bitch', 111);    echo "<br>".Bitch.$arr2[0]; #用.来连接字符串和变量    echo "<br>".__FILE__;#php提供了几个常量 这个是其中一个    #变量的作用域    # 1)函数内部的作用域就是函数    # 2)函数外部的是整个php 但是用户自定义的函数无法使用    # 要想使用必须使用    $heng = 'ha';    function hello(){    	global $heng;    	echo "<br>".$heng;    }    hello();    #动态变量    #并不是我想的那样    /*    $a1 = 1;    $b1 = $a1;    echo "<br>".$b1;    $a1 = 2;    echo "<br>".$b1;	*/	$chang_name = "trans";	$trans = 'You can see me';    echo "<br>$chang_name----$$chang_name";        #php内置好多预定义的变量 使用前必须先赋值给一个我们自己定义的    #变量才能用 参考 http://php.net/manual/zh/reserved.variables.php     $host  = $_SERVER['HTTP_HOST'];    echo "<br>$host";    #字符串运算符    #只有.这一个运算符号 不能使用加号    echo "<br>$a"."$b";//13    echo "<br>".("$a"+"$b");//4    #连接字符    $a.=$b;#相当于 $a = $a.$b;    echo "<br>".$a;    #逻辑运算 && = and, || = or,异或运算xor 一真一假 则为 真    if ($a and $b) {    	echo "<br>条件成立";    }    [email protected]    $worry = @(5 / 0);    #php函数 类似于javascript     function HelloWorld(){        echo "<br><b>nihao</b>";    }    HelloWorld();    #引用传值 和c++一样 默认参数 和c一样    $a10 = 8;    function zijia(&$a){        $a += 10;    }    zijia($a10);    echo "<br>$a10";    #支持变量函数 所谓变量函数就是使用变量名字调用函数    $func = "HelloWorld";    $func();    #对函数的引用的就是对函数返回值的应用    function h(){        return "HelloWorld";    }    $aaaa = h();    echo "<br>".$aaaa;    #声明一个引用类型的函数    #发现引用函数不能直接返回一个常量    #所以 可以预见的是它返回的是一个变量的    #地址 而不是copy一个值直接复制给接收的变量    function &hh(){        $str = "HelloWorld";        return $str;    }    $bbbb = &hh();    echo "<br>$bbbb";    #当引用结束的时候可以通过unset()来解除引用    #php命名规范    #类名使用驼峰法    #类属性前面就前缀m    #类的方法命名 一般规律前缀如 IS Get Set    #变量使用小驼峰命名    #引用变量要有前缀r 全局变量有加g前缀 静态变量使用s前缀    #变量分割使用_    #方法,类在不是用_ 而是使用大小写就可以了    #php流程控制语句 和其他语言一样 多出了一个foreach()    #类似于java的增强for循环    #在一个复杂的php页面中可能包含多个条件语句,循环语句    #和函数 使用{}会很麻烦 所以php提供了另外一个方式 使用":"    #代替"{",使用"end*"代替"}"    #支持endif,endwhile,endfor,endreach,endswitch    $s = 1;    echo "<br>";    while($s++ ";    endwhile;    ?>
Copy after login

2楼shamingai3小时前
hello world
Re: u0132241483小时前
回复shamingainHello Girl
Re: shamingai3小时前
回复u013224148n哈哈哈,幸会幸会
Re: u0132241483小时前
回复shamingain幸会幸会!能遇到程序媛不容易!
Re: shamingai2小时前
回复u013224148n是么?那我偷偷跟你讲,在我博客下评的好多是妹子
1楼u0132241483小时前
Hello Girl
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