php编程 之 php进阶练习

<?php
echo date("Y/m/d") . "<br>";  //返回2016/10/21
echo date("Y.m.d") . "<br>";    //返回2016.10.21
echo date("Y-m-d");    //返回2016-10-21
?>

<?php
$file=fopen("filename.txt","r");
?>

if (feof($filename)) echo "文件结尾";

<?php
$file = fopen("welcome.txt", "r") or exit("无法打开文件!");
// 读取文件每一行，直到文件结尾
while(!feof($file))    //如果没有到达文件末尾
{
    echo fgets($file). "<br>";    //就逐行读取文件
}
fclose($file);    //到了末尾就关闭
?>

<?php
$file=fopen("welcome.txt","r") or exit("无法打开文件!");
while (!feof($file))
{
    echo fgetc($file);    //注意，fgetc（）函数，这是逐字读取。
}
fclose($file);
?>

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str = fread($fp,filesize($file_path));//指定读取大小，这里把整个文件内容读取出来
echo $str = str_replace("
","<br />",$str);
}
?>

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$str = file_get_contents($file_path);//将整个文件内容读入到一个字符串中
$str = str_replace("
","<br />",$str);
echo $str;
}
?>

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str = "";
$buffer = 1024;//每次读取 1024 字节
while(!feof($fp)){//循环读取，直至读取完整个文件
$str .= fread($fp,$buffer);
} 
$str = str_replace("
","<br />",$str);
echo $str;
}
?>

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$file_arr = file($file_path);
for($i=0;$i<count($file_arr);$i++){//逐行读取文件内容
echo $file_arr[$i]."<br />";
}
/*
foreach($file_arr as $value){
echo $value."<br />";
}*/
}
?>

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str ="";
while(!feof($fp)){
$str .= fgets($fp);//逐行读取。如果fgets不写length参数，默认是读取1k。
}
$str = str_replace("
","<br />",$str);
echo $str;
}
?>

<?php
function wgTime()
{
    date_default_timezone_set('Asia/Shanghai'); 
    $t=date("Y.m.d.H.i.s")."
";
    //var_dump($t);
    $file=fopen("t1.txt","a");
    fwrite($file,$t);
    fclose($file);
    $file="t1.txt";
    if(file_exists($file)){
        $file_arr=file($file);    //行读取
        for ($i=0;$i<count($file_arr);$i++){
            $str=explode(".",$file_arr[$i]);
            $dw=array("Y ","M ","D ","H ","I ","S ");
            for ($j=0;$j<6;$j++){
        //echo $j."序号"."<br>";
                echo $str[$j],$dw[$j];
            }
            echo "<br>";
        }
    }
}
//wgTime();    因为调用的时候会直接执行，所以要注释掉才好调用
?>

<?php
require_once "t1.php";    //表示调用一次
wgTime();
?>

//mysqli-面向对象
<?php
$servername="localhost";
$username="xxx";
$password="xxx";
$conn=new mysqli($servername,$username,$password);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
} 
echo "连接成功";
?>
//mysqli-面向过程
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$conn = mysqli_connect($servername, $username, $password);
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
echo "连接成功";
?>

<?php
$servername = "localhost";
$username = "xxx";
$password = "xxx";
$dbname="daqingdb";    //在这里可以直接加入datebase参数。
$conn = mysqli_connect($servername, $username, $password,$dbname);
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
echo "连接成功 <br>";
$sql="create table wgtime (`id` int(4) unsigned auto_increment primary key,time varchar(20) not null)";
if (mysqli_query($conn,$sql)){
    echo "创建table:wgTime 成功!<br>";
}else{
    echo "创建表error".mysqli.error($conn);
}
mysqli_close($conn);
echo "exitd!";
?>

<?php
date_default_timezone_set('Asia/Shanghai');
$t=date("Y.m.d.H.i.s")."
";
$servername = "localhost";
$username = "xxx";
$password = "xxx";
$dbname="daqingdb";    //在这里可以直接加入datebase参数。
$conn = mysqli_connect($servername, $username, $password,$dbname);
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
echo "连接成功 <br>";
// $sql="create table wgtime (`id` int(4) unsigned auto_increment primary key,currtime varchar(30) not null)";
// if (mysqli_query($conn,$sql)){
//     echo "创建table:wgTime 成功!<br>";
// }else{
//     echo "创建表error".mysqli.error($conn);
// }
$sql1="INSERT INTO `wgtime`(`currtime`) VALUES ('$t')";    //$t要用单引号表明
if (mysqli_query($conn,$sql1)){
    echo "新纪录插入成功 <br>";
}else{
    echo "error:".mysqli_error($conn);    //打印出mysql返回的错误
}
//$sql2="select * from `wgtime`";
$sql2="select `currtime` from `wgtime`";
$result=mysqli_query($conn,$sql2);
//var_dump($result);    $result竟然是个object对象类！其方法或者属性有：current_field,field_count,lengths,num_rows,type.
if (mysqli_num_rows($result)>0){    //mysqli_num_rows($result)返回数据库中查询到的记录的行数
    echo "查询成功<br>";
    while ($row=mysqli_fetch_assoc($result)){
        //var_dump($row); 这是一个数组，类似于字典吧。
        $dw=array("Y ","M ","D ","H ","I ","S ");
        $str=explode(".",$row["currtime"]);        
        for($i=1;$i<6;$i++){
            echo $str[$i],$dw[$i]; 
        }
        echo "<br>";
    }
}else{
    echo "error:".mysqli_error($conn);
}
mysqli_close($conn);
echo "exitd!";
?>

<?php
function dirBuilder($d,$t,$note)    //参数分别是：文件夹名，文件名，文件内容
{
    // date_default_timezone_set('Asia/Shanghai');    //也可以不用参数，改用时间
    // $d=date("Y年m月d日");
    // $t=date("H时i分s秒");
    // $note="hello";
    $dirpath="C:/xampp/htdocs/daqing_new/dir_test/$d";    //判断文件夹是否存在，不存在就创建
    if (!file_exists($dirpath)){
        mkdir($dirpath,0777,true);
        //echo "新建文件夹<br>";
    }

    chdir($dirpath);    
    //echo "改变当前文件夹<br>";
    if (file_exists("C:/xampp/htdocs/daqing_new/dir_test/$d/$t.txt")){    //判断是否有同名文件
        echo "文件已经存在，没有创建新的<br>";
    }else{
        //echo "文件不存在，新建<br>";
        $myfile=fopen("$t.txt",'w');
        fwrite($myfile,$note);
        fclose($myfile);
    }
    $list=scandir($dirpath);    //读取文件夹下的文件目录
    var_dump($list);    //$list是一个数组，带着文件名和length，不能直接打印
    for($i=2;$i<count($list);$i++){
        echo "$list[$i] <br>";
    }
}
dirBuilder('123',"345","hello i am daqing");
?>

<?php
echo '
<!DOCTYPE html>
<html>
    <head>
        <title> </title>
    </head>
    <body>
        <span>测试页面</span>
    </body>
</html>
';
?>
//返回：测试页面

<?php
$content='hello';echo <<<EOF
‘$content’
EOF
?>
//返回：'hello'，证明这种方法支持单双引号的使用

<?php
function test(){
    echo "function test! <br>";
}
?>    //方法或者函数需要写在<?php  ?>中，下文的输出也要写在这样的格式中

<!DOCTYPE html>    //html语句不需要写在<?php ?>中，php会理解的。
<html>
    <head>
        <title><?php test();?> </title>
    </head>
    <body>
        <span><?php test();echo 'lala';?></span>
    </body>
</html>

//输出：function test! <br> lala

<html>

<head>
<meta charset="utf-8">    //在标题里，定义了网页的元信息，比如编码方式charset
<title>    //title标签，会显示在浏览器窗口的头上
大晴测试
</title>
</head>

<body>
<button name= "logup" type = "submit" >呵呵</button>    //button中定义的是这个按键的属性
</body>

</html>