This document provides an introduction and overview of PHP, including what PHP is, what is needed to use it, basic syntax, variables, data types, operators, control structures like if/else and loops, functions, and includes/requires. Key points covered include PHP being a server-side scripting language, basic syntax using <?php ?> tags, common variable types and scoping, operators for arithmetic, comparison and logic, and common control structures for conditional execution and repetition.

1. Introduction to PHP Todd Barber IT Analyst III / University Webmaster Information Technology Services

10. Operator Precedence Associativity Operators Additional Information non-associative new new left [ array() non-associative ++ -- increment/decrement non-associative ~ - (int) (float) (string) (array) (object) @ types non-associative instanceof types right ! logical left * / % arithmetic left + - . arithmetic and string left << >> bitwise non-associative < <= > >= comparison non-associative == != === !== comparison left & bitwise and references left ^ bitwise left | bitwise left && logical left || logical left ? : ternary right = += -= *= /= .= %= &= |= ^= <<= >>= assignment left and logical left xor logical left or logical left , (comma) many uses

26. More switch <?php $i = 4; switch ($i) { case 0: case 1: case 2: case 3: echo “I is less than 4”; break; case 4: echo “I is equal to 4”; break; default: echo “I is greater than 4”; break; ?> Combining cases Omitting Breaks <?php $i = 4; switch ($i) { case 0: case 1: case 2: case 3: echo “I is less than 4”; case 4: echo “I is equal to 4”; default: echo “I is greater than 4”; ?>