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 – if Keyword
The PHP if keyword is used to create an if conditional. The elseif and else keywords can then be used to run code when the if condition is not met.
PHP – ignore_user_abort() Function
The PHP ignore_user_abort() function sets whether a user should abort a script execution when they disconnect.
PHP – implements Keyword
The PHP implements keyword is used to declare that a class must have the methods described in the specified interface (called polymorphism).
PHP – include Keyword
The PHP include keyword is used to embed PHP code from another file. If the file is not found, a warning is shown and the program continues to run.
PHP – include_once Keyword
The PHP include_once keyword is used to embed PHP code from another file. If the file is not found, a warning is shown and the program continues to run.
PHP – inet_ntop() Function
The PHP inet_ntop() function converts a 32bit IPv4 or 128bit IPv6 address into a readable format.
PHP – inet_pton() Function
The PHP inet_pton() function converts a readable IP address into a packed 32bit IPv4 or 128bit IPv6 format.
PHP – instanceof Keyword
The PHP instanceof keyword is used to check if an object belongs to a class, and returns true if the object is an instance of the class or false if not.
PHP – insteadof Keyword
The PHP insteadof keyword allows you to select from which trait a method should be taken if more than one trait has a method with the same name.
PHP – interface Keyword
The PHP interface keyword is used to create interfaces, which is a structure which defines a list of methods that must exist in a class.