An introduction to PHP knowledge
In the process of PHP website development and construction, we often encounter the need to parse XML documents. The PHP4 version comes with an XML parser (sax), and the PHP5 version adds the XML extension of SimpleXML (based on dom), which can The parsing is very convenient. Today I will share with you how to parse XML documents in different environments. XML document 1234567891011121314151617181920 Leapsoul-PHP website development http://www.leapsoul.cn Share the fun of PHP website development and construction, and teach you how to build a website &nbs
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Introduction: In the process of PHP website development and construction, we often encounter the need to parse XML documents. The PHP4 version comes with an XML parser (sax), and the PHP5 version adds a SimpleXML (based on dom) XML extension. XML parsing is very convenient. Today I will share with you how to parse XML documents in different environments. XML document1234567891011121314151617181920
Introduction: Principle: com is an extension class of PHP. The server with office installed will automatically call the com of word.application. Documents can be automatically generated, PHP official documentation manual: http://www.php.net/manual/en/class.com.php Use official example: 1234567891011121314151617##3. php commonly used header columnheader sink header header usage
Introduction: header:php commonly used header: 123456789101112131415161718192021222324252627282930313233343536373839404142 434445464748495051525354555657584. Chinese character conversion pinyin PHP obtains Chinese characters All the pinyin and the first letter of the Chinese character (reprinted)
## Introduction: Convert Chinese Pinyin: Convert Chinese Pinyin to PHP to get all the pinyin and the first letter of the Chinese character (reprinted): 12345678910111213141516171819202122232425262728293031323334353637 3839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979 89910010110210
5. Several methods for PHP to determine whether a remote file exists_PHP tutorial
Introduction: PHP determines whether a remote file exists Several methods. When doing a picture preview, I encountered a problem, which is to determine whether the remote file exists (not on the same server). The code is as follows: 01020304050607080910111213141
6. JS and PHP retain two decimal places example rounding using the function toFixed()_PHP tutorial
Introduction: JS and PHP retain two decimal places. Examples of rounding use the function toFixed(). JS retains two decimal places example to round using function toFixed() html head /head script language="javascript" document.write("h1JS retains two decimal places example/h1br"); var a=2.1512131231231
7. 10 frequently used php fragments_PHP tutorial
Introduction: 10 frequently used php fragments. 1. Find the distance between Longitudes and Latitudes 12345678910111213141516171819202122232425262728 function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2)
8. PHP file download principle, _PHP tutorial
Introduction: PHP file download principle. PHP file download principle, 1. PHP download principle diagram 2. File download source code: 1234567891011121314151617181920212223242526 ?php $file_name = "Haha.jpg" ; //File to be downloaded $file
9 . [Transfer] Write your own PHP extension and create a class, php one class_PHP tutorial
Introduction: [Transfer] Write your own PHP extension and create a class , a php class. [Transfer] Write your own PHP extension to create a class, php a class original text: http://www.imsiren.com/archives/572 For example, we want to create a class.. The PHP code is as follows 123456789101112131415161718 cl
Introduction: PHP gets Chinese characters The pinyin (all with the first letter) (reprinted), php Chinese characters. PHP gets the pinyin of Chinese characters (all and the first letter) (reprinted), php Chinese characters 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545 55657585960
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The above is the detailed content of An introduction to PHP knowledge. For more information, please follow other related articles on the PHP Chinese website!

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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.

There are four main error types in PHP: 1.Notice: the slightest, will not interrupt the program, such as accessing undefined variables; 2. Warning: serious than Notice, will not terminate the program, such as containing no files; 3. FatalError: the most serious, will terminate the program, such as calling no function; 4. ParseError: syntax error, will prevent the program from being executed, such as forgetting to add the end tag.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

HTTP request methods include GET, POST, PUT and DELETE, which are used to obtain, submit, update and delete resources respectively. 1. The GET method is used to obtain resources and is suitable for read operations. 2. The POST method is used to submit data and is often used to create new resources. 3. The PUT method is used to update resources and is suitable for complete updates. 4. The DELETE method is used to delete resources and is suitable for deletion operations.

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The arrow function was introduced in PHP7.4 and is a simplified form of short closures. 1) They are defined using the => operator, omitting function and use keywords. 2) The arrow function automatically captures the current scope variable without the use keyword. 3) They are often used in callback functions and short calculations to improve code simplicity and readability.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
