What’s the difference between __sleep and __wakeup?
__sleep returns the array of all the variables that need to be saved, while __wakeup retrieves them.
Are Parent constructors called implicitly inside a class constructor?
No, a parent constructor have to be called explicitly as follows: parent::constructor($value)
In PHP, objects are they passed by value or by reference?
In PHP, objects are passed by reference.
What does accessing a class via :: means?
:: is used to access static methods that do not require object initialization.
What is the function func_num_args() used for?
The function func_num_args() is used to give the number of parameters passed into a function.
How is the ternary conditional operator used in PHP?
It is composed of three expressions: a condition, and two operands describing what instruction should be performed when the specified condition is true or false as follows: Expression_1?Expression_2 : Expression_3;
When is a conditional statement ended with endif?
When the original if was followed by: and then the code block without braces.
How is it possible to cast types in PHP?
The name of the output type has to be specified in parentheses before the variable which is to be cast as follows: (int), (integer) – cast to integer (bool), (boolean)…
Will a comparison of an integer 15 and a string “18” work in PHP?
“18” and 15 can be compared in PHP since it casts everything to the integer type.