Let us make day-to-day examples to make a correct decision. We often look for people that have more experience than us in terms of age or success. Because we think they must have gone through the condition. Similarly here PHP Uses if, else if …..else and switch statements to make a decision based on different conditions. For this, you can use conditional statements inside your script.
Let us understand more about the decision making statements-
- If…..else statement – we use this statement in a code where a condition is true and another one is false or not true.
Syntax-
if (condition)
code to be executed if the condition is true;
else
code to be executed if the condition is false;
Example – <html>
<body>
<?php
$d = date("D");
if ($d == "Fri")
echo "Have a nice weekend!";
else
echo "Have a nice day!";
?>
</body>
</html>
Output
Have a nice weekend!
- Elseif statement – we use this statement when out of several conditions one condition is true.
Syntax –
if (condition)
code to be executed if the condition is true;
elseif (condition)
code to be executed if the condition is true;
else
code to be executed if the condition is false;
Example- <html>
<body>
<?php
$d = date("D");
if ($d == "Fri")
echo "Have a nice weekend!";
elseif ($d == "Sun")
echo "Have a nice Sunday!";
else
echo "Have a nice day!";
?>
</body>
</html>
Output –
Have a nice Weekend!
- Switch statement – we use it when out of many blocks of code one is to be executed. It was generated to avoid long blocks of if….elseif……else code.
Syntax –
switch (expression){
case label1:
code to be executed if expression = label1;
break;
case label2:
code to be executed if expression = label2;
break;
default:
code to be executed
if expression is different
from both label1 and label2;
Example-
<html>
<body>
<?php
$d = date("D");
switch ($d){
case "Mon":
echo "Today is Monday";
break;
case "Tue":
echo "Today is Tuesday";
break;
case "Wed":
echo "Today is Wednesday";
break;
case "Thu":
echo "Today is Thursday";
break;
case "Fri":
echo "Today is Friday";
break;
case "Sat":
echo "Today is Saturday";
break;
case "Sun":
echo "Today is Sunday";
break;
default:
echo "Wonder which day is this ?";
}
?>
</body>
</html>
Output - Today is Monday
