php基本知识

1.php数组基础：

<?php $ary2 = "zqhung_hongzequan_zqhong"; $arr3 =explode("_",$ary2);//拆分字符串 echo $arr3[1];//打印出来的结果是hongzequan $ary1 = array("aa","bb"); $ary1[0]="zqhung";//修改数组中的值 echo $ary1[0],"<br>";//打印出来的结果是zqhung $ary3 = array("id"=>55); $aa = is_array($ary1);//判断变量是否为数组 echo $aa,"<br>"; echo count($ary1),"<br>";//判断数组中元素的个数 foreach($arr3 as $key=>$value)//遍历数组中的元素 { echo $value,"<br>"; } ?>

 2.连接mysql

<?php $conn = @ mysql_connect("localhost", "root", "") or die("连接失败");//连接mysql mysql_select_db("quanquanfly", $conn) or die("连接失败");//连接quanquanfly数据库 $sql = "insert into aa (name,age) value ('1','2')"; mysql_query($sql, $conn);//执行插入操作 /** * 执行查询并显示操作 */ $sql1 = "select * from aa"; $query = mysql_query($sql1,$conn); $select = mysql_fetch_array($query); while ($select = mysql_fetch_array($query)) { echo $select[age], "<br><hr>"; } echo mysql_num_rows($query);//表中的条目数 mysql_close($conn);//关闭连接 ?>

3.简单分页;

<?php include ("conn.php"); $pagesize = 5;//显示条数 $url = $_SERVER["REQUEST_URI"];//$_SERVER预定义服务器变量，获取当前的uri，除域名外 $url = parse_url($url);//将url解析成有固定键值名称的数组的函数 $url = $url[path]; if ($_GET[page]) { $pagecurrent = $_GET[page];//获取uri中的page值 $page = ($pagecurrent-1) * $pagesize;//从第几条记录开始查询 $page .= ','; } echo $pagecurrent; if($pagecurrent<=1) $pagecurrent=1; echo $page,$pagesize,"<br>","<a href = $url?page=".($pagecurrent-1).">上一页</a>","<a href = $url?page=".($pagecurrent+1).">下一页</a>","<br>"; $sql = "select * from aa limit $page $pagesize";//从$page条记录开始查询，查询$pagesize条数据 $query = mysql_query($sql, $conn); //$select = mysql_fetch_array($query); while ($select = mysql_fetch_array($query)) { echo $select[age], " ", $select[name], "<br><hr>"; } ?>

4.文件上传:

<?php if (is_uploaded_file($_FILES['upfile']['tmp_name'])) {//判断上传文件是否存在 $type = $_FILES['upfile']['type']; $tmp_name = $_FILES['upfile']['tmp_name']; $name = $_FILES['upfile']['name']; //print_r($_FILES['upfile']);// 打印出文件的相关信息..关键 switch ($type) { case 'application/msword' ://doc文件类型 $ok = 1; break; default : $ok = 0; break; } if($ok==1){move_uploaded_file($tmp_name, "up/".$name);}//移动文件，将上传的文件移到自己想要的位置 else{echo "上传格式错误";} } ?> <form action="" method="post" enctype="multipart/form-data"> <input type="file" name="upfile" size="50" maxlength="100000" accept="text/*"/><br/> <input type="submit" value="上传"/> </form>

5.读取、写入和删除文件：

<?php $fp = fopen("tmp.html","r"); $str = fread($fp,filesize("tmp.html"));//读取文件，filesize为判断有多少个字符 echo $str; $str = str_replace("{title}","新标题",$str);//utf-8会出现乱码，使用gbk编码 $str = str_replace("{content}","新内容",$str);//替换{content}为新内容 fclose($fp); echo $str; $str1 = fgets($fp,10);//按行读取信息，也可以在后面加数字限定读取字符数 $aa = ftell($fp);//返回当前所处的指针位置 fseek($fp,0);//定位指针的位置 $handle = fopen("new.html","w"); fwrite($handle,$str);//将$str写入到new.html的文件中 fclose($handle); echo "生成成功"; unlink("new.html");//删除文件，返回boolean ?>

6.构造函数和析构函数：

class Person { function __construct($name,$age)//构造函数 { $this->name = $name; $this->age = $age; echo "person:",$name,"<br>"; } var $name; var $age; function hello() { echo "你好","<br>"; } function __destruct()//析构函数 { echo $this->name,"<br>"; } }

7.面向对象：

class My{ function __tostring() { return "这是个空类"; } function __call($n,$v){//错误显示 echo "错误的方法名".$n."<br>"; echo "错误的值".$v."<br>"; } }

function __autoload($name){//自动加载$name为该类的名字，与文件名相同 include ("$name.php"); } $my1 = new My(); $my2 = clone $my1;//克隆，两个对象 echo $my1;//打印tostring函数内容

8.感触颇深的一个类：

Class Mysql{ private $host; private $name; private $pwd; private $table; function __construct($host,$name,$pwd,$table){ $this->host=$host; $this->name=$name; $this->pwd=$pwd; $this->table=$table; } function connection(){ $conn = mysql_connect($this->host,$this->name,$this->pwd) or die("连接失败"); mysql_select_db($this->table,$conn)or die ("没有这个数据库"); } function insert($sql){ $query = mysql_query($sql); } } $db = new Mysql("localhost","root","","quanquanfly"); $db->connection(); //$db->insert("insert into aa (name,age) values (33,33)");

9.smarty查询数据到页面上：

include ("include.php"); $conn = mysql_connect("localhost","root","")or die ("连接失败"); $db = mysql_select_db("quanquanfly",$conn) or die("该数据库不存在"); $sql = "select * from aa"; $name = "I love you"; $query = mysql_query($sql,$conn); while($select = mysql_fetch_array($query)) {$array[]=array("name"=>$select[name],"age"=>$select[age]);}//将查询的结果放进二维数组里面 $smarty->assign("array",$array); $smarty->display("index.html");

{section name = list loop = $array} 名字：{$array[list].name} 年龄：{$array[list].age}<br> {/section}

10.smarty诸多语法：

{foreach item = v key = k from = $array}//遍历数组中的key和value {$k}-{$v}<br> {/foreach}

$array[] = array("aa"=>"aa","bb"=>"bb"); $array[] = array("aa"=>"cc","bb"=>"dd");//array为二维数组

11.smarty缓存问题：

在配置文件中加入：

$smarty->cache_dir = './cache/';//缓存文件夹 $smarty->caching = true; $smarty->cache_lifetime = 60;//缓存时间

$smarty->clear_all_cache();//清楚所有缓存 $smarty->clear_cache("index.html",$id); function insert_get_time()//不缓存内容 { return date("Y-m-d H:m:s"); } html中代码： {insert name = "get_time"}