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if... else... else if Statements
We use the if... else... else if statements to establish conditional logic and evaluate things when needed in our scripts. Sometimes you have to evaluate values to then give the user the correct output on page once the variable value is checked.

Learn HTML
$current_temperature 37;
// Current South Pole temperature
// Then the if statement will evaluate it for us
if ($current_temperature 32) {
// Set things to melt if the temp is exceeding 32(freezing)
echo "Doom! The icecaps will melt, sea levels will rise."
// If the temp is still freezing(32), nothing at all will happen in this script

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Doom! The icecaps will melt, sea levels will rise.

Learn HTML
$current_temperature 30;
// Current South Pole temperature

if (
$current_temperature 32) {
"Doom! The icecaps melt, sea levels rise.";
} else {
"The temperature is below freezing, everything is stable in the south pole.";

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The temperature is below freezing, everything is stable in the south pole.

else if allows us to keep evaluating using if statements as many times as needed.

else if
Learn HTML
$cur_temp 28;
// Current South Pole temperature

if (
$cur_temp 32) { // If temp is greater than 32 degrees F
echo "The icecaps melt, sea levels rise.";
} else if (
$cur_temp < -45) { // If temp is less than -45 degrees F
echo "Mammals that live on surface start to die, it is too cold for them to live.";
} else if (
$cur_temp < -250) {  // If temp is less than -250 degrees F
echo "The entire planet freezes over on the crust, all life on top dies.";
} else { 
// default last clause, can be removed if needed
echo "Everything is great, and earth conditions are fine for a good balance.";

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Everything is great, and earth conditions are fine for a good balance.

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