Overview of PHP network functions_PHP tutorial
Overview of PHP network functions
checkdnsrr — Check DNS communication for the specified host (domain name) or IP addresscloselog — Close system log link
define_syslog_variables — initialize all syslog related variables
dns_check_record — checkdnsrr alias
dns_get_mx — getmxrr alias
dns_get_record — Get the DNS record of the specified host
fsockopen — Open a network connection or a Unix socket connection
gethostbyaddr — Get the host name corresponding to the specified IP address
gethostbyname — Get the IP address corresponding to the specified host name
gethostbynamel — Get a series of IP addresses corresponding to the specified host name
gethostname — Get hostname
getmxrr — Get the MX record corresponding to the specified host name
getprotobyname — Get the protocol number corresponding to the specified protocol name
getprotobynumber — Get the protocol name corresponding to the specified protocol number
getservbyname — Get the port number corresponding to the specified Internet service and protocol
getservbyport — Get the Internet service corresponding to the specified protocol and port number
header_register_callback — Call a header function
header_remove — Remove previously set header
header — send a custom http message
headers_list — Returns a list of sent (or ready to send) response headers
headers_sent — Check if headers have been sent or where to send them
http_response_code — Get or set the HTTP response code
inet_ntop — Convert an encapsulated network address to dotted decimal representation
inet_pton — Convert a dotted decimal IP address into an encapsulated (in_addr) representation
ip2long — Convert an IPV4 string Internet protocol into a numeric format
long2ip — Convert an IPV4 number format into a string Internet Protocol
openlog — Open a connection to the system logger
pfsockopen — Open a persistent network connection or Unix socket connection.
setcookie — send cookie
setrawcookie — Send a raw cookie (cookie value is not URL-encoded)
socket_get_status — stream_get_meta_data alias
socket_set_blocking — stream_set_blocking alias
socket_set_timeout — stream_set_timeout alias
syslog — Generate a system log message

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Go language provides two dynamic function creation technologies: closure and reflection. closures allow access to variables within the closure scope, and reflection can create new functions using the FuncOf function. These technologies are useful in customizing HTTP routers, implementing highly customizable systems, and building pluggable components.

In C++ function naming, it is crucial to consider parameter order to improve readability, reduce errors, and facilitate refactoring. Common parameter order conventions include: action-object, object-action, semantic meaning, and standard library compliance. The optimal order depends on the purpose of the function, parameter types, potential confusion, and language conventions.

1. The SUM function is used to sum the numbers in a column or a group of cells, for example: =SUM(A1:J10). 2. The AVERAGE function is used to calculate the average of the numbers in a column or a group of cells, for example: =AVERAGE(A1:A10). 3. COUNT function, used to count the number of numbers or text in a column or a group of cells, for example: =COUNT(A1:A10) 4. IF function, used to make logical judgments based on specified conditions and return the corresponding result.

The advantages of default parameters in C++ functions include simplifying calls, enhancing readability, and avoiding errors. The disadvantages are limited flexibility and naming restrictions. Advantages of variadic parameters include unlimited flexibility and dynamic binding. Disadvantages include greater complexity, implicit type conversions, and difficulty in debugging.

The benefits of functions returning reference types in C++ include: Performance improvements: Passing by reference avoids object copying, thus saving memory and time. Direct modification: The caller can directly modify the returned reference object without reassigning it. Code simplicity: Passing by reference simplifies the code and requires no additional assignment operations.

The key to writing efficient and maintainable Java functions is: keep it simple. Use meaningful naming. Handle special situations. Use appropriate visibility.

The difference between custom PHP functions and predefined functions is: Scope: Custom functions are limited to the scope of their definition, while predefined functions are accessible throughout the script. How to define: Custom functions are defined using the function keyword, while predefined functions are defined by the PHP kernel. Parameter passing: Custom functions receive parameters, while predefined functions may not require parameters. Extensibility: Custom functions can be created as needed, while predefined functions are built-in and cannot be modified.

Exception handling in C++ can be enhanced through custom exception classes that provide specific error messages, contextual information, and perform custom actions based on the error type. Define an exception class inherited from std::exception to provide specific error information. Use the throw keyword to throw a custom exception. Use dynamic_cast in a try-catch block to convert the caught exception to a custom exception type. In the actual case, the open_file function throws a FileNotFoundException exception. Catching and handling the exception can provide a more specific error message.
