Conditional Structures

Conditional structures are instructions which run different code, based on a condition.

This includes if-elsif-then, switch(), match(), the ternary operators ? … : and ?: and the Coalesce operator ??.

<?php

if (!function_exists('foo')) {
    function foo() {
        // doSomething
    }
}

?>

Related : Switch, Match, If Then Else, Coalesce Operator, Ternary Operator