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.
PHP – is_dir() Function
The PHP is_dir() function checks whether the specified filename is a directory.
PHP – is_executable() Function
The PHP is_executable() function checks whether the specified filename is executable.
PHP – is_file() Function
The PHP is_file() function checks whether the specified filename is a regular file.
PHP – is_finite() Function
The PHP is_finite() function checks whether a value is finite or not, and returns true (1) if the value is a finite number, or false/nothing if not.
PHP – is_infinite() Function
The PHP is_infinite() function checks whether a value is infinite or not, and returns true (1) if the value is an infinite number, or false/nothing if not.
PHP – is_link() Function
The PHP is_link() function checks whether the specified filename is a symbolic link.
PHP – is_nan() Function
The PHP is_nan() function checks whether a value is ‘not a number’, and returns true (1) if the value is ‘not a number’ or false/nothing if it is a number.
PHP – is_readable() Function
The PHP is_readable() function checks whether the specified filename is readable.
PHP – is_uploaded_file() Function
The PHP is_uploaded_file() function checks whether the specified file is uploaded via HTTP POST.
PHP – is_writable() Function
The PHP is_writable() function checks whether the specified filename is writable.