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.
How can you pass a variable by reference?
To be able to pass a variable by reference, we use an ampersand in front of it, as follows $var1 = &$var2
How is a constant defined in a PHP script?
The define() directive lets us defining a constant as follows: define ("TESTCONSTANT", 100);
Which cryptographic extension provide generation and verification of digital signatures?
The PHP-OpenSSL extension provides several cryptographic operations including generation and verification of digital signatures.