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if elseif else

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elseif

elseif combines if and else. The if statement is extended to execute a different statement in case the original if expression is not met. But, the alternative expression is only executed, when the elseif conditional expression is met.

The following code displays either “a is bigger than b”, “a is equal to b” or “a is smaller than b”: 

if ($a > $b) {
    echo "a is bigger than b";
} elseif ($a == $b) {
    echo "a is equal to b";
} else {
    echo "a is smaller than b";
}

Several elseif statements

You can use multiple elseif statements within the same if statement: 

if ($a == 1) {
    echo "a is One";
} elseif ($a == 2) {
    echo "a is Two";
} elseif ($a == 3) {
    echo "a is Three";
} else {
    echo "a is not One, not Two nor Three";
}
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* Alternative syntax for control structures
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