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More Conditional Control Structure

• The elseif statement is a conditional control structure that can be associated with an if statement. If an if statement’s test condition is FALSE and an associated elseif statement’s test condition is TRUE , the elseif’s statement group gets executed.
• Multiple elseif statements can be associated with a single if statement.
• An else statement can be appended to the end of a series of if/elseif statements so if none of the if/elseif test conditions evaluate to TRUE , then the else statement group will be executed.
• A switch() statement is used to compare a single test expression against different values, known as cases , and then evaluate any code associated with the case it matches.
• Case values can only be expressions that evaluate to one of the scalar data types (int, float, string, bool) or NULL .
• A switch() statement executes all statements it encounters after a matching case is found until either a break statement or the end of the switch() statement is reached, whichever occurs first.
• A default case can be assigned to a switch() whose associated statement(s) will be executed if the test expression did not match any case in the switch().
• Additional Resources:
  • PHP Manual - elseif Statement
  • PHP Manual - switch() Statement
  • PHP Manual - break Statement