相对于explode()来说,strtok()函数可以控制节奏。按需切割字串。其优点是:
1、可以一次定义多个分隔符。函数在执行时,是按单个分隔符来切割,而不是按整个分隔符,而explode则是按整个分隔串来切割的。正因此,explode可以用中文切割,而strtok则不行,会乱码。
2、在使用while或for配合strtok()遍历时,可以随时更换分隔符,也可以随时用break跳出终止切割。
示例1:演示用中文+explode来切割
$string = "这是PHP论坛 论坛版块 论坛栏目 论坛H管理员 论坛会员"; $arr = explode("论坛",$string); foreach($arr as $v) { echo $v." "; } echo "------------- "; |
返回:
这是PHP 版块 栏目 H管理员 会员 ------------- |
示例2:演示更换切割符,注意后面WHILE中不再带有“H”分隔符。而只是用空格。
$string = "这是PHP论坛 论坛版块 论坛栏目 论坛H管理员 论坛会员"; $tok = strtok($string, " H"); //空格+H $n=1; while ($tok !== false) { echo "$tok "; $tok = strtok(" "); //空格 //if($n>2)break; //可以随时跳出。 //$n++; } echo "------------- "; |
返回:
这是P P论坛 论坛版块 论坛栏目 论坛H管理员 论坛会员 ------------- |
示例3:演示多分隔符。
$string = "This is\tan example\nstring"; $tok = strtok($string, " \n\t"); #空格,换行,TAB while ($tok !== false) { echo "$tok "; $tok = strtok(" \n\t"); } echo "------------- "; |
返回:
This is an example string ------------- |
$string = "abcde 123c4 99sadbc99b5232"; $tok = strtok($string, "bc"); while ($tok !="") { echo "$tok "; $tok = strtok("bc"); } echo "------------- "; |
返回:
a de 123 4 99sad 99 5232 ------------- |
示例4:演示用for来遍历:
$line = "leon\tatkinson\tleon@clearink.com"; for($token = strtok($line,"\t");$token!="";$token=strtok("\t")) { print("token: $token \n"); } |
返回:
token: leon token: atkinson token: leon@clearink.com |

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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