最近打算重拾PHP来开发一些小型应用，很久没用PHP了，有些语法都生疏了，今天上午写了三个例子，基本上把之前的PHP复习了一下。
基础语法操作:
<?php//输出的方式测试echo '###################输出测试################<br>';echo '测试输出1(单引号)<br>';echo "测试塑出2(双引号)<br>";?><?='测试输出3(=表达式)<br>'?><? echo '测试输出4(单个表达式)<br>'; ?><?php //类型echo '###################类型测试################<br>';$testInt = 1;$testStr = "字符串";$testFloat = 1.23;$testBoolean = false; //false/true:如果转换成字符串则为空/"1"，转换成整型则为0/1$testArray = array("first"=>1,2,3,4,5);$testStr2 = $testStr; //testStr修改，testStr2不会修改$testStr3 = &$testStr; //testStr修改，testStr3也会修改echo '整型:'.$testInt.'<br>';echo '字符串型:'.$testStr.'<br>';$testStr = '字符串修改了';echo '字符串型修改后:'.$testStr.'<br>';echo '字符串型修改后(2):'.$testStr2.'<br>';echo '字符串型修改后(3):'.$testStr3.'<br>';echo '浮点型:'.$testFloat.'<br>';echo '布尔型:'.(int)$testBoolean.'<br>';echo '数组测试(1):'.$testArray[0].'<br>';echo '数组测试(2):'.$testArray['first'].'<br>';print_r($testArray);echo '<br>';foreach ($testArray as $i => $value) { echo '数组迭代结果:'.$i."->".$value."<br>";}//IO操作echo '##################IO操作####################<br>';echo '读取该文件的内容:<br>';$theFileName = "test_base.php"; //文件名称或者全路径$handle = fopen ($theFileName, "rb");$contents = fread ($handle, filesize ($theFileName));fclose ($handle); echo '<div style="border:1px solid #aaa;color:blue;"><pre>'.htmlspecialchars($contents).'</pre></div>';?>数据库的处理：
<?php//四种引用方式//require 'test_base.php'; //无条件的引用,报错会终止应用,引用的文件只处理一次//require_once 'test_base.php'; //无条件的引用,报错会终止应用,引用的文件只处理一次并只显示一次//include 'test_base.php'; //可有条件的引用,报错不会终止应用,引用的文件处理多次//include_once 'test_base.php'; //可有条件的引用,报错不会终止应用,引用的文件处理多次但只显示一次//数据库的测试$hostname = '192.168.1.6'; /*数据库服务器访问地址*/$username = 'root'; /*数据库用户帐号*/$password = 'root'; /*数据库密码*/$database = 'phptest'; /*数据库名称*/$databaseCharset = 'GBK'; /*数据库编码,防止插入中文乱码和报错*///获取请求信息$actionSubmit = $_REQUEST['submit'];$reqTheType = $_REQUEST['theType'];if($reqTheType == null || $reqTheType == '') { $reqTheType = '1';}echo '请求信息:'.$actionSubmit."|".$reqTheType.'<br>';if($actionSubmit != null && $actionSubmit != '') { if($reqTheType == '1') { testSearch(); } if($reqTheType == '2') { testInsert(); testSearch(); } if($reqTheType == '3') { testUpdate(); testSearch(); }}/** * 数据库查询 * Enter description here ... */function testSearch() { echo '查询数据<br>'; global $hostname,$username,$password,$database,$databaseCharset; $currentConn = null; $currentConn = mysql_connect ( $hostname, $username, $password ); mysql_select_db ( $database ); mysql_query("set names charset ".$databaseCharset); mysql_query("set names ".$databaseCharset); $result = mysql_query ( "select * from e_user" ); //查询动作返回的是result结果集 while ( $row = mysql_fetch_object ( $result ) ) { echo $row->uri . "\t" . ($row->username) . "<br>"; } mysql_free_result ( $result ); mysql_close ( $currentConn );}/** * 数据库数据添加 * Enter description here ... */function testInsert() { global $hostname,$username,$password,$database,$databaseCharset; $insertSql = "insert into e_user(uri,username,password) values"; $insertSql .= "("; $insertSql .= "'".generateId()."','测试用户','123456'"; $insertSql .= ")"; $currentConn = null; $currentConn = mysql_connect ( $hostname, $username, $password ); mysql_select_db ( $database ); mysql_query("set names charset ".$databaseCharset); mysql_query("set names ".$databaseCharset); echo '添加数据'.$insertSql.'<br>'; $result = mysql_query($insertSql); //插入动作返回的是boolean if(!$result) { die('Error: ' . mysql_error()); } mysql_close ( $currentConn );}/** * 数据库修改 * Enter description here ... */function testUpdate() { global $hostname,$username,$password,$database,$databaseCharset; $updateSql = "update e_user"; $updateSql .= " set username='修改后的用户名称' where uri = '001'"; $currentConn = null; $currentConn = mysql_connect ( $hostname, $username, $password ); mysql_select_db ( $database ); mysql_query("set names charset ".$databaseCharset); mysql_query("set names ".$databaseCharset); echo '修改数据'.$updateSql.'<br>'; $result = mysql_query($updateSql); //插入动作返回的是boolean if(!$result) { die('Error: ' . mysql_error()); } mysql_close ( $currentConn );}/** * 自动生成ID号 * @param unknown_type $count */function generateId($count = 6) { $resultId = ''; for($i=0;$i<$count;$i++) { $resultId .= (string)rand(0, 9); } return $resultId;}?><form><input type="radio" name="theType" value="1" <? if($reqTheType == '1') {?>checked="checked"<? } ?>/>查询数据测试 <input type="radio" name="theType" value="2" <? if($reqTheType == '2') {?>checked="checked"<? } ?>/>添加数据测试<input type="radio" name="theType" value="3" <? if($reqTheType == '3') {?>checked="checked"<? } ?>/>修改数据测试 <input type="submit" name="submit" value="提交" /></form>面向对象编程：
<?php//基础的抽象用户类abstract class BaseUser { protected $flag = 0; abstract function showInfo();}//接口类interface Module { function start(); function stop();}//测试PHP类和对象class MyUser extends BaseUser implements Module { /*成员变量*/ private $uri = ''; private $type = ''; protected $username = ''; public $password = ''; /*静态变量*/ const USER_TYPE_NORMAL = "normal"; /*构造函数*/ function __construct($uri = '',$username = '', $password = '') { $this->uri = $uri; $this->username = $username; $this->password = $password; $this->flag = '100'; $this->type = self::USER_TYPE_NORMAL; } /*测试静态函数的处理*/ static function testStatic() { //$this->username = 'static'; //该方法是错误的,静态方法中只能操作静态变量 return self::USER_TYPE_NORMAL; } /*get set 方法用于管理内部的字段属性*/ public function getUri() { return $this->uri; } public function getUsername() { return $this->username; } public function getPassword() { return $this->password; } public function setUri($uri) { $this->uri = $uri; } public function setUsername($username) { $this->username = $username; } public function setPassword($password) { $this->password = $password; } public function getType() { return $this->type; } public function setType($type) { $this->type = $type; } /*实现底层的抽象方法*/ function showInfo() { echo '我是MyUser对象.'; } //实现接口方法 public function start() { echo '启动MyUser对象....'; } //实现接口方法 public function stop() { echo '停止MyUser对象....'; }}//扩展自MyUser的类class MyExtendUser extends MyUser implements Module { /*覆盖父类的构造函数*/ function __construct($uri = '',$username = '', $password = '') { //调用父类的构造函数 parent::__construct($uri,$username,$password); //实现自己的一些初始化动作 $this->flag = '200'; } /*覆盖父类的getUsername方法*/ public function getUsername() { return '继承自MyUser,'.$this->username; } //实现接口方法 public function start() { echo '启动MyExtendUser对象....'; } //实现接口方法 public function stop() { echo '停止MyExtendUser对象....'; }}//测试用户对象$theUserObj = new MyUser('001','测试用户1','123');echo '用户名称:'.$theUserObj->getUsername().'<br>';print_r($theUserObj);echo '<br>';echo '测试静态函数1:'.$theUserObj->testStatic().'<br>';echo '测试静态函数2:'.MyUser::testStatic().'<br>';echo '测试实现的接口:';$theUserObj->start();echo '<br>';//测试继承$theUserObj2 = new MyExtendUser('002','测试用户2','123');echo '用户名称2(继承):'.$theUserObj2->getUsername().'<br>';print_r($theUserObj2);echo '<br>';echo '测试实现的接口2:';$theUserObj2->start();echo '<br>';?>