testl True/False Indicate whether the statement is true or false. TRUE is A and FALSE is B -1. All web pages containing PHP code must have an extension of php 2. S _ABC1 is a valid variable identifier. 3. In PHP, you can declare a variable without assigning a value to it. 4. Constant names, like variable names, must begin with a S. 5. Array names are often referred to with the array operators [ and ] at the end of the name to clearly define them as arrays. 6 The numbering of elements within an array starts with an index number of one (1). 7. A unary operator requires an operand before or after the operator 8. A compari 9. A son operator returns a Boolean value of TRUE or FALSE after two operands have been compared return statement is a statement that returns a value to the statement that called the function Variable scope refers to the location that a declared variable can be used. In PHP, you must declare a global variable with the globa1 keyword inside a function definition for the 10. 11. variable to be available within the scope of that function. 12. When one decision-making statement is contained within another decision-making statement, they are referred to as multiple decision-making structures. 13. The switch statement controls program flow by executing a specific set of statements, depending on the 14. The concatenation assignment operator (-) combines two text strings. 15. The str_word_count () function returns the number of digits in a string 16. The strpos () function performs a case-sensitive search for specified characters in a string and returns the position of the first occurrence of a substring within a string 17. The strtok () function breaks a program into functions 18. The syntax for the strtok() function is Svariable strtok(string, separators) : 19 The explode ) function splits a string into an indeted aray at a specified sepurion