php学习（一）
<?php //写cookiesetcookie("user", "wang70937", time()+60);//sessionsession_start();if(isset($_SESSION['views'])) $_SESSION['views']=$_SESSION['views']+1;else $_SESSION['views']=1;echo "Session: Views=". $_SESSION['views']."<br />";?><script > function Show(){ alert("asdf"); }</script><html> <title>php测试页面 </title> <head><script src="clienthint.js"></script></head> <body> <?php //输出 echo "<br />"."[******输出******]"."<br />"; echo "Hello World!"."<br />"; $a = "Php"; $b = "Language"; echo $a." ".$b."<br />"; //数组 echo "<br />"."[******数组******]"."<br />"; $arr = array("abcde", "fghijk", "lmnopq"); foreach($arr as $value) { echo $value."<br />"; } //函数 echo "<br />"."[******函数******]"."<br />"; function FunA($A, $B){ echo "函数参数：".$A.", ".$B; return "ret_value"; } $ret = FunA(123, "param"); echo "函数返回值：".$ret."<br />"; echo "<br />"."[******表单******]"."<br />"; ?> <form action="form.php" method="post"> Name: <input type="text" name="name" /> Age: <input type="text" name="age" /> <input type="submit" /> </form> <?php echo "<br />"; echo "<br />"."[******上传文件******]"."<br />"; ?> <form action="upload_file.php" method="post" enctype="multipart/form-data"> <label for="file">Filename:</label> <input type="file" name="file" id="file" /> <br /> <input type="submit" name="submit" value="Submit" /> </form> <?php //session echo "<br />"."[******session******]"."<br />"; //retrieve session data echo "Pageviews=". $_SESSION['views']; ?> <br /> <!-- //删除session --> <?php //echo "<br />"."[******删除session******]"."<br />"; // session_destroy(); ?> <?php //发送邮件 echo "<br />"."[******发送邮件******]"."<br />"; $to = "wang70937@163.com"; $subject = "Test mail"; $message = "Hello! This is a simple email message."; $from = "wang70937@gmail.com"; $headers = "From: $from"; mail($to,$subject,$message,$headers); echo "Mail Sent."."<br />"; ?> <?php //mysql数据库 echo "<br />"."[******mysql数据库******]"."<br />"; $con = mysql_connect("localhost","root","1"); if (!$con) { die('Could not connect: ' . mysql_error()); } else echo "连接Mysql成功!"."<br />"; mysql_select_db("bbs", $con); mysql_query("set names GBK"); //show tables $TableCount = mysql_query("show tables"); while($Table = mysql_fetch_array($TableCount)) { //表名 $TableName = $Table[0]; $sql = "select * from ".$TableName; $result = mysql_query($sql); echo "<br />表：[".$TableName."]<br />"; //表的字段个数 $FiledCount = mysql_num_fields($result); //记录条数 $RecordCount = mysql_num_rows($result); echo "sql[".$sql."] 记录条数：".$RecordCount."<br />"; if($FiledCount > 0 ) { echo "<table border='1'>; <tr> <th>记录序号</th>"; for($index=0; $index<$FiledCount; $index++) { //字段名 $FiledName = mysql_fetch_field($result); echo "<th>$FiledName->name</th>"; } echo "</tr>"; $No = 0; while($row = mysql_fetch_array($result)) { $No = $No + 1; echo "<tr>"; echo "<td>" . $No . "</td>"; for($index=0; $index<$FiledCount; $index++) { echo "<td>" . $row[$index] . "</td>"; } echo "</tr>"; } echo "</table>"; } } mysql_close($con); ?> <?php //xml解析 echo "<br />"."********xml解析********"."<br />"; /*$xmlDoc = new DOMDocument(); $xmlDoc->load("note.xml"); $x = $xmlDoc->documentElement; foreach ($x->childNodes AS $item) { print $item->nodeName . " = " . $item->nodeValue . "<br />"; }*/ $xml = simplexml_load_file("note.xml"); echo $xml->getName() . "<br />"; foreach($xml->children() as $child) { echo $child->getName() . ": " . $child . "<br />"; } ?> <?php //ajax echo "<br />"."*******ajax*******"."<br />"; ?> <form> First Name: <input type="text" id="txt1" //onkeyup="showHint(this.value)" onkeyup="Show()"> </form> <p>Suggestions: <span id="txtHint"></span></p> </body> </html>
<p class="sycode"> 1 <? php 2 // 写cookie 3 setcookie ( " user " , " wang70937 " , time () + 60 ); 4 // session 5 session_start (); 6 7 if ( isset ( $_SESSION [ ' views ' ])) 8 $_SESSION [ ' views ' ] = $_SESSION [ ' views ' ] + 1 ; 9 10 else 11 $_SESSION [ ' views ' ] = 1 ; 12 echo " Session: Views= " . $_SESSION [ ' views ' ] . " <br /> " ; 13 ?> 14 15 < script > 16 function Show(){ 17 alert( " asdf " ); 18 } 19 </ script > 20 21 < html > 22 < title > php测试页面 </ title > 23 < head >< script src = " clienthint.js " ></ script ></ head > 24 < body > 25 <? php 26 // 输出 27 echo " <br /> " . " [******输出******] " . " <br /> " ; 28 echo " Hello World! " . " <br /> " ; 29 $a = " Php " ; 30 $b = " Language " ; 31 echo $a . " " . $b . " <br /> " ; 32 33 // 数组 34 echo " <br /> " . " [******数组******] " . " <br /> " ; 35 $arr = array ( " abcde " , " fghijk " , " lmnopq " ); 36 foreach ( $arr as $value ) 37 { 38 echo $value . " <br /> " ; 39 } 40 41 // 函数 42 echo " <br /> " . " [******函数******] " . " <br /> " ; 43 function FunA( $A , $B ){ 44 echo " 函数参数： " . $A . " , " . $B ; 45 return " ret_value " ; 46 } 47 $ret = FunA( 123 , " param " ); 48 echo " 函数返回值： " . $ret . " <br /> " ; 49 50 51 echo " <br /> " . " [******表单******] " . " <br /> " ; 52 ?> 53 < form action = " form.php " method = " post " > 54 Name : < input type = " text " name = " name " /> 55 Age : < input type = " text " name = " age " /> 56 < input type = " submit " /> 57 </ form > 58 59 <? php echo " <br /> " ; 60 61 echo " <br /> " . " [******上传文件******] " . " <br /> " ; 62 ?> 63 < form action = " upload_file.php " method = " post " 64 enctype = " multipart/form-data " > 65 < label for = " file " > Filename :</ label > 66 < input type = " file " name = " file " id = " file " /> 67 < br /> 68 < input type = " submit " name = " submit " value = " Submit " /> 69 </ form > 70 71 <? php 72 // session 73 echo " <br /> " . " [******session******] " . " <br /> " ; 74 75 // retrieve session data 76 echo " Pageviews= " . $_SESSION [ ' views ' ]; 77 ?> 78 < br /> 79 80 <!-- // 删除session --> 81 <? php 82 // echo "<br />"."[******删除session******]"."<br />"; 83 // session_destroy(); 84 ?> 85 86 <? php 87 // 发送邮件 88 echo " <br /> " . " [******发送邮件******] " . " <br /> " ; 89 90 $to = " wang70937@163.com " ; 91 $subject = " Test mail " ; 92 $message = " Hello! This is a simple email message. " ; 93 $from = " wang70937@gmail.com " ; 94 $headers = " From: $from " ; 95 mail ( $to , $subject , $message , $headers ); 96 echo " Mail Sent. " . " <br /> " ; 97 ?> 98 99 <? php 100 // mysql数据库 101 echo " <br /> " . " [******mysql数据库******] " . " <br /> " ; 102 $con = mysql_connect ( " localhost " , " root " , " 1 " ); 103 if ( ! $con ) 104 { 105 die ( ' Could not connect: ' . mysql_error ()); 106 } 107 else 108 echo " 连接Mysql成功! " . " <br /> " ; 109 mysql_select_db ( " bbs " , $con ); 110 mysql_query ( " set names GBK " ); 111 // show tables 112 $TableCount = mysql_query ( " show tables " ); 113 while ( $Table = mysql_fetch_array ( $TableCount )) 114 { 115 // 表名 116 $TableName = $Table [ 0 ]; 117 $sql = " select * from " . $TableName ; 118 $result = mysql_query ( $sql ); 119 120 echo " <br />表：[ " . $TableName . " ]<br /> " ; 121 // 表的字段个数 122 $FiledCount = mysql_num_fields ( $result ); 123 // 记录条数 124 $RecordCount = mysql_num_rows ( $result ); 125 126 echo " sql[ " . $sql . " ] 记录条数： " . $RecordCount . " <br /> " ; 127 128 if ( $FiledCount > 0 ) 129 { 130 echo " <table border='1'>; 131 <tr> 132 <th>记录序号</th> " ; 133 for ( $index = 0 ; $index < $FiledCount ; $index ++ ) 134 { 135 // 字段名 136 $FiledName = mysql_fetch_field ( $result ); 137 echo " <th> $FiledName ->name</th> " ; 138 } 139 echo " </tr> " ; 140 $No = 0 ; 141 while ( $row = mysql_fetch_array ( $result )) 142 { 143 $No = $No + 1 ; 144 echo " <tr> " ; 145 echo " <td> " . $No . " </td> " ; 146 for ( $index = 0 ; $index < $FiledCount ; $index ++ ) 147 { 148 echo " <td> " . $row [ $index ] . " </td> " ; 149 } 150 echo " </tr> " ; 151 } 152 echo " </table> " ; 153 154 } 155 } 156 157 158 159 160 mysql_close ( $con ); 161 ?> 162 163 <? php 164 // xml解析 165 echo " <br /> " . " ********xml解析******** " . " <br /> " ; 166 167 /* $xmlDoc = new DOMDocument(); 168 $xmlDoc->load("note.xml"); 169 170 $x = $xmlDoc->documentElement; 171 foreach ($x->childNodes AS $item) 172 { 173 print $item->nodeName . " = " . $item->nodeValue . "<br />"; 174 } */ 175 $xml = simplexml_load_file ( " note.xml " ); 176 177 echo $xml -> getName() . " <br /> " ; 178 179 foreach ( $xml -> children() as $child ) 180 { 181 echo $child -> getName() . " : " . $child . " <br /> " ; 182 } 183 ?> 184 185 <? php 186 // ajax 187 echo " <br /> " . " *******ajax******* " . " <br /> " ; 188 ?> 189 < form > 190 First Name : 191 < input type = " text " id = " txt1 " 192 // onkeyup="showHint(this.value)" 193 onkeyup = " Show() " > 194 </ form > 195 196 < p > Suggestions : < span id = " txtHint " ></ span ></ p > 197 198 199 </ body > 200 201 </ html > </p>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1653
14
1413
52
1304
25
1251
29
1224
24
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
What are Enumerations (Enums) in PHP 8.1?
Apr 03, 2025 am 12:05 AM
The enumeration function in PHP8.1 enhances the clarity and type safety of the code by defining named constants. 1) Enumerations can be integers, strings or objects, improving code readability and type safety. 2) Enumeration is based on class and supports object-oriented features such as traversal and reflection. 3) Enumeration can be used for comparison and assignment to ensure type safety. 4) Enumeration supports adding methods to implement complex logic. 5) Strict type checking and error handling can avoid common errors. 6) Enumeration reduces magic value and improves maintainability, but pay attention to performance optimization.
Describe the SOLID principles and how they apply to PHP development.
Apr 03, 2025 am 12:04 AM
The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.
How does session hijacking work and how can you mitigate it in PHP?
Apr 06, 2025 am 12:02 AM
Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What is REST API design principles?
Apr 04, 2025 am 12:01 AM
RESTAPI design principles include resource definition, URI design, HTTP method usage, status code usage, version control, and HATEOAS. 1. Resources should be represented by nouns and maintained at a hierarchy. 2. HTTP methods should conform to their semantics, such as GET is used to obtain resources. 3. The status code should be used correctly, such as 404 means that the resource does not exist. 4. Version control can be implemented through URI or header. 5. HATEOAS boots client operations through links in response.
How do you handle exceptions effectively in PHP (try, catch, finally, throw)?
Apr 05, 2025 am 12:03 AM
In PHP, exception handling is achieved through the try, catch, finally, and throw keywords. 1) The try block surrounds the code that may throw exceptions; 2) The catch block handles exceptions; 3) Finally block ensures that the code is always executed; 4) throw is used to manually throw exceptions. These mechanisms help improve the robustness and maintainability of your code.
What are anonymous classes in PHP and when might you use them?
Apr 04, 2025 am 12:02 AM
The main function of anonymous classes in PHP is to create one-time objects. 1. Anonymous classes allow classes without names to be directly defined in the code, which is suitable for temporary requirements. 2. They can inherit classes or implement interfaces to increase flexibility. 3. Pay attention to performance and code readability when using it, and avoid repeatedly defining the same anonymous classes.
