Answer:- PHP has borrowed its syntax from Perl and C.

Answer:- Scalar type declarations, Return type declarations, Null coalescing operator (??), Spaceship operator, Constant arrays using define(), Anonymous classes, Closure::call method, Group use declaration, Generator return expressions, Generator delegation, Space ship operator

Answer:- PHP echo output one or more string. It is a language construct not a function. So the use of parentheses is not required. But if you want to pass more than one parameter to echo, the use of parentheses is required.

Answer:- void echo ( string $arg1 [, string $... ] )

Answer:- PHP print output a string. It is a language construct not a function. So the use of parentheses is not required with the argument list. Unlike echo, it always returns 1. Syntax: int print ( string $arg)

Answer:- Echo can output one or more string but print can only output one string and always returns 1. Echo is faster than print because it does not return any value.

Answer:- A PHP variable is the name of the memory location that holds data. It is temporary storage. Syntax: $variableName=value;

Answer:- $message stores variable data while $$message is used to store variable of variables. $message stores fixed data whereas the data stored in $$message may be changed dynamically.

Answer:- PHP constants are name or identifier that cant be changed during execution of the script. PHP constants are defined in two ways: Using define() function Using const() function

Answer:- PHP magic constants are predefined constants, which change based on their use. They start with a double underscore (__) and end with a double underscore (__).

Answer:- PHP data types are used to hold different types of data or values. There are 8 primitive data types which are further categorized in 3 types: Scalar types Compound types Special types

Answer:- PHP single line comment is made in two ways: Using // (C++ style single line comment), Using # (Unix Shell style single line comment) PHP multi-line comment is made by enclosing all lines within.

Answer:- For, while, do-while and for each.

Answer:- The PHP count() function is used to count total elements in the array, or something an object.