php语法基础

//设置php页面编码

header("Content-Type:text/html; charset=gb2312");

 

//数组的使用

<?php

$arr = array("123","321", "34435");

echo $arr[1];

echo "<br>";

$arr1 = array("key1" => "456","key2" => "89",4 => "45");

echo $arr1[key2];

echo "<br>";

 

$arr2 = array(23,34,1,2,54);

sort($arr2);//自动从小到大进行排列

print_r($arr2);

echo "<br>";

print_r($arr1);

?>

 

//使用list提取数组

<?php

$array = array("PHP", "MySql", "Apache");

list($php, $mysql, $apache) = $array;

echo "$php+$mysql+$apache<br>";

function test()

{

$value[] = "php";

$value[] = "mysql";

$value[] = "apache";

return $value;

}

list($php,$mysql,$apache) = test();

echo "$php*$mysql*$apache";

?>

 

//引用赋值，与全局，局部变量

<?php

$str1 = "eduask";

$str2 = "shanghai";

echo $str2."<br>";

$str2 = &$str1;//引用赋值

echo $str2."<br>";

$str1 = "eduask beijing";

echo $str2."<br>";

$str2 = "shanghai eduask";

echo $str1."<br>";

function test()

{

//$str1 = "In the function str1"; //局部变量

echo $str1."<br>";

}

test();

echo $str1."<br>";//全局变量

?>

 

//变量中，单引号和双引号的区别（不解释，解释）

 

<?php

$str="123";

echo '$str';

echo "$str";

?>

 

 

//isset(变量),判断是否设置了值

if(isset($name))

 

 

 

 

//加载（包含）外部php文件

include_once("外部文件");