else
(PHP 4, PHP 5, PHP 7, PHP 8)
Often you'd want to execute a statement if a certain condition is met, and a different statement if the condition is not met. This is what else is for. else extends an if statement to execute a statement in case the expression in the if statement evaluates to false. For example, the following code would display a is greater than b if $a is greater than $b, and a is NOT greater than b otherwise:
<?php
$a = 3;
$b = 5;
if ($a > $b) {
echo "a is greater than b\n";
} else {
echo "a is NOT greater than b\n";
}The above example will output:
a is NOT greater than bThe else statement is only executed if the if expression evaluated to false, and if there were any elseif expressions - only if they evaluated to false as well (see elseif).
In case of nested if-else statements, an else is always associated with the nearest if.
<?php
$a = false;
$b = true;
if ($a)
if ($b)
echo "b";
else
echo "c";The above example will output:
Despite the indentation (which does not matter for PHP), the else is associated with the if ($b), so the example does not produce any output. While relying on this behavior is valid, it is recommended to avoid it by using curly braces to resolve potential ambiguities.