


How to use the ob (Output Buffer output buffer) function in php_PHP tutorial
From: http://bbs.phome.net/ShowThread/?threadid=9247&forumid=2
In PHP programming, we often encounter some functions that directly generate output, such as passthru(), readfile(), var_dump () etc. But sometimes we want to import the output of these functions into a file, or process it first and then output it, or process the output of these functions as a string.
At this time we have to use Output Buffer( Output buffering) function.
There are mainly several functions that handle output buffering:
ob_start() starts output buffering. At this time, PHP stops outputting, and all subsequent outputs are transferred to an internal In the buffer.
ob_get_contents() This function returns the contents of the internal buffer. This is equivalent to turning these outputs into strings.
ob_get_ length() Returns the length of the internal buffer.
ob_end_flush() Ends the output buffer, and outputs the contents of the buffer. After this, the output is normal output.
ob_end_clean() Ends the output buffer, and discards the contents of the buffer. .
For example, the var_dump() function outputs the structure and content of a variable, which is very useful during debugging.
But if the content of the variable contains special HTML features such as Characters are invisible when output to the web page. What should I do?
Using the output buffer function can easily solve this problem.
ob_start();
var_dump($var);
$out = ob_get_contents();
ob_end_clean();
At this time, the output of var_dump() already exists in $out . You can output it now:
echo '
' . htmlspecialchars($out) . '' ;
Or wait until the future, or send this string to the template (Template) for output.

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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