if, else, and elseif

An if statement is used to execute an action when a condition is met. The following shows the syntax for an if statement; the statements enclosed by the if statement execute if the condition evaluates to true:

if (<condition>) {
    <statements>
}

The else statement is optional and runs if all previous conditions evaluate as false:

if (<first-condition>) {
    <first-statements>
} else {
    <second-statements>
}

The elseif statement allows several conditions to be tested in order:

if (<first-condition>) {
    <first-statements>
} elseif (<second-condition>) {
    <second-statements>
} elseif (<last-condition>) {
    <last-statements>
}

The else statement may be added after any number of elseif statements.

Execution of a block of conditions stops as soon as a single condition is true. For example, both the first and second condition would evaluate to true, but only the first executes:

$value...