PHP – gmdate() Function
The PHP gmdate() function formats a GMT/UTC date and time, and returns the formatted date string.
PHP – gmstrftime() Function
The PHP gmstrftime() function formats a GMT/UTC time and/or date according to locale settings.
PHP – gregoriantojd() Function
The PHP gregoriantojd() function converts a date from the Gregorian Calendar to a Julian Day Count.
PHP – header() Function
The PHP header() function sends a raw HTTP header to a client, and must be called before any actual output is sent.
PHP – header_register_callback() Function
The PHP header_register_callback() function calls a header function to be executed after all PHP headers are sent, and before any other output is sent.
PHP – header_remove() Function
The PHP header_remove() function removes an HTTP header previously set with the header() function.
PHP – headers_list() Function
The PHP headers_list() function returns a list of response headers to be sent to the browser.
PHP – headers_sent() Function
The PHP headers_sent() function checks if/where headers have been sent.
PHP – hexdec() Function
The PHP hexdec() function converts a hexadecimal number to a decimal number.
PHP – highlight_file() Function
The PHP highlight_file() function outputs a file with the PHP syntax highlighted. The syntax is highlighted by using HTML tags.
PHP – highlight_string() Function
The PHP highlight_string() function outputs a string with the PHP syntax highlighted. The syntax is highlighted by using HTML tags.
PHP – http_response_code() Function
The PHP http_response_code() function sets or returns the HTTP response status code.
PHP – hypot() Function
The PHP hypot() function calculates the hypotenuse of a right-angle triangle.
PHP – ignore_user_abort() Function
The PHP ignore_user_abort() function sets whether a user should abort a script execution when they disconnect.
PHP – inet_ntop() Function
The PHP inet_ntop() function converts a 32bit IPv4 or 128bit IPv6 address into a readable format.