PHP if / else if / else Statement Example

IF Statement

If an expression is TRUE then execute a statement.

if (expression) {
    statement;
}

Example

$a = 2;
$b = 4;


if ($a < $b) {
  echo 'a is smaller than b';
}

Result

a is smaller than b

But what if the expression is FALSE?

IF, ELSE Statement

If an expression is TRUE do this, if FALSE do that.

if (expression) {
    statement;
} else {
    statement;
}

Example

$a = 6;
$b = 4;


if ($a < $b) {
  echo 'a is smaller than b';
} else {
  echo 'a is not smaller than b';
}

Result

a is not smaller than b

What if you want to check more than one expression?

IF, ELSE IF, ELSE Statement

Testing multiple expression if TRUE then execute default statement if FALSE

if (expression) {
  statement;
} elseif (expression) {
  statement;
} else {
  statement;
}

Example

$a = 4;
$b = 4;


if ($a < $b) {
  echo 'a is smaller than b';
} else if ($a == $b) {
  echo 'a equals b';
} else {
  echo 'a is not smaller than b';
}

Result

a equals b