PHP基础开发代码示例～
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.'<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booleanif(!$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booleanif(!$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>';?>
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