像下面这个程序:
<?
header("Content-type: text/html; charset=gb2312"); $act=$_GET["act"];if($act=="del") { //删除记录
$id =$_GET["id"];
require('conn.php');
$conn->query("delete from lyb where id=$id");
fy(); }if($act=="list") { fy();}function fy() {
require('conn.php');
$sql="select * from lyb order by ID desc";
//echo $sql;$result=$conn->query($sql);}如果把 require('conn.php');写在函数的外面就不行,如下所示。这样如果有几个if语句的话,require('conn.php');就要重复写几遍,很不方便。我记得无参无返回值的函数,其实就相当于把该函数体中的代码插入到调用函数的位置处,但从这里看并不是这样的哦。<?
header("Content-type: text/html; charset=gb2312");
require('conn.php');
$act=$_GET["act"];if($act=="del") { //删除记录
$id =$_GET["id"];
$conn->query("delete from lyb where id=$id");
fy(); }if($act=="list") { fy();}function fy() {
$sql="select * from lyb order by ID desc";
//echo $sql;$result=$conn->query($sql);}
<?
header("Content-type: text/html; charset=gb2312"); $act=$_GET["act"];if($act=="del") { //删除记录
$id =$_GET["id"];
require('conn.php');
$conn->query("delete from lyb where id=$id");
fy(); }if($act=="list") { fy();}function fy() {
require('conn.php');
$sql="select * from lyb order by ID desc";
//echo $sql;$result=$conn->query($sql);}如果把 require('conn.php');写在函数的外面就不行,如下所示。这样如果有几个if语句的话,require('conn.php');就要重复写几遍,很不方便。我记得无参无返回值的函数,其实就相当于把该函数体中的代码插入到调用函数的位置处,但从这里看并不是这样的哦。<?
header("Content-type: text/html; charset=gb2312");
require('conn.php');
$act=$_GET["act"];if($act=="del") { //删除记录
$id =$_GET["id"];
$conn->query("delete from lyb where id=$id");
fy(); }if($act=="list") { fy();}function fy() {
$sql="select * from lyb order by ID desc";
//echo $sql;$result=$conn->query($sql);}
function fy() {
global $conn;
$sql="select * from lyb order by ID desc";
//echo $sql;
$result=$conn->query($sql);}