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### 9 Cards in this Set

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 What are the three ways to mark coding? What is the precedence of PHP operators? Associativity | Operators non-associative new right [ right ! ~ ++ -- (int) (float) (string) (array) (object) @ left * / % left + - . left << >> non-associative < <= > >= non-associative == != === !== left & left ^ left | left && left || left ? : right = += -= *= /= .= %= &= |= ^= <<= >>= right print left and left xor left or left , What are the arithmetic operators in PHP? Example Name Result \$a + \$b Addition Sum of \$a and \$b. \$a - \$b Subtraction Difference of \$a and \$b. \$a * \$b Multiplication Product of \$a and \$b. \$a / \$b Division Quotient of \$a and \$b. \$a % \$b Modulus Remainder of \$a divided by \$b. PHP supports eight primitive types. Name 1 type? Boolean- This is the easiest type. A boolean expresses a truth value. It can be either TRUE or FALSE. PHP supports eight primitive types. Name 1 type? Boolean- This is the easiest type. A boolean expresses a truth value. It can be either TRUE or FALSE. What are the 8 types that PHP supports? PHP supports eight primitive types. Four scalar types: boolean integer float (floating-point number, aka 'double') string Two compound types: array object And finally two special types: resource NULL What are variables? Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive. Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*' What is a constant? A constant is an identifier (name) for a simple value. As the name suggests, that value cannot change during the execution of the script (except for magic constants, which aren't actually constants). A constant is case-sensitive by default. By convention, constant identifiers are always uppercase. What is an expression? Expressions are the most important building stones of PHP. In PHP, almost anything you write is an expression. The simplest yet most accurate way to define an expression is "anything that has a value".