These functions allow you to get many parameters about PHP itself, such as: runtime configuration, loaded extensions, version, etc. You will also find functions for setting options for your running PHP. Probably the most useful PHP-function phpinfo() can be found here.
Options and information functions:
assert_options — Set/get various flags for assertions
assert — Check if an assertion is FALSE
cli_get_process_title — Return the current process title
cli_set_process_title — Set the process title
dl — Run When loading a PHP extension
extension_loaded — Check if an extension has been loaded
gc_collect_cycles — Force collection of all existing garbage cycles
gc_disable — Disable the cyclic reference collector
gc_enable — Activate the cyclic reference collector
gc_enabled — Return the status of the circular reference counter
get_cfg_var — Get the value of the PHP configuration option
get_current_user — Get the current PHP script owner name
get_defined_constants — Return an associative array of all constants, the key is the constant name, the value is the constant value
get_extension_funcs — Returns an array of module function names
get_include_path — Gets the current include_path configuration option
get_included_files — Returns an array of included and required file names
get_loaded_extensions — Returns an array of all compiled and loaded module names
get_magic_quotes_g pc — Get the current Configuration option settings of magic_quotes_gpc
get_magic_quotes_runtime — Get the activation status of the current magic_quotes_runtime configuration option
get_required_files — Alias get_included_files
getenv — Get the value of an environment variable
getlastmod — Get the last modification time of the page
getmygid — Get the current PHP GID of the script owner
getmyinode — Get the index node (inode) of the current script
getmypid — Get the ID of the PHP process
getmyuid — Get the UID of the PHP script owner
getopt — Get options from the command line argument list
getrusage — Get the current resource usage
ini_alter — Alias ini_set
ini_get_all — Get all configuration options
ini_get — Get the value of a configuration option
ini_restore — Restore the value of the configuration option
ini_set — For a configuration option Set value
magic_quotes_runtime — alias set_magic_quotes_runtime
main — virtual main
memory_get_peak_usage — Returns the peak amount of memory allocated to PHP
memory_get_usage — Returns the amount of memory allocated to PHP
php_ini_loaded_file — Get the loaded php.ini file Path
php_ini_scanned_files — Returns a list of .ini files parsed from the extra ini directory
php_logo_guid — Gets the guid of the logo
php_sapi_name — Returns the interface type between the web server and PHP
php_uname — Returns information about the system running PHP Information
phpcredits — Print the list of PHP contributors
phpinfo — Output information about the PHP configuration
phpversion — Get the current PHP version
putenv — Set the value of the environment variable
restore_include_path — Restore the value of the include_path configuration option
set_include_path — Set the include_path configuration option
set_magic_quotes_runtime — Set the activation status of the current magic_quotes_runtime configuration option
set_time_limit — Set the maximum execution time of the script
sys_get_temp_dir — Return the directory used for temporary files
version_compare — Compare two "PHP specifications of Version number string
zend_logo_guid — Get the Zend guid
zend_thread_id — Return the unique identifier of the current thread
zend_version — Get the version of the current Zend engine

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.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.

Key players in HTTP cache headers include Cache-Control, ETag, and Last-Modified. 1.Cache-Control is used to control caching policies. Example: Cache-Control:max-age=3600,public. 2. ETag verifies resource changes through unique identifiers, example: ETag: "686897696a7c876b7e". 3.Last-Modified indicates the resource's last modification time, example: Last-Modified:Wed,21Oct201507:28:00GMT.

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 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.


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