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The if, elseif and else statements in PHP are
used to perform different actions based on different conditions.
Conditional Statements
Very often when you write code, you want to perform different
actions for different decisions.
You can use conditional statements in your code to do this.
- if...else statement - use this statement if you
want to execute a set of code when a condition is true and
another if the condition is not true
- elseif statement - is used with the if...else
statement to execute a set of code if one of several
condition are true
The If...Else Statement
If you want to execute some code if a condition is true and
another code if a condition is false, use the if....else
statement.
Syntax
if (condition)
code to be executed if condition is true;
else
code to be executed if condition is false;
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Example
The following example will output "Have a nice weekend!" if
the current day is Friday, otherwise it will output "Have a nice
day!":
<html>
<body>
<?php
$d=date("D");
if ($d=="Fri")
echo "Have a nice weekend!";
else
echo "Have a nice day!";
?>
</body>
</html>
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If more than one line should be executed if a condition is
true/false, the lines should be enclosed within curly braces:
<html>
<body>
<?php
$d=date("D");
if ($d=="Fri")
{
echo "Hello!<br />";
echo "Have a nice weekend!";
echo "See you on Monday!";
}
?>
</body>
</html>
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The ElseIf Statement
If you want to execute some code if one of several conditions
are true use the elseif statement
Syntax
if (condition)
code to be executed if condition is true;
elseif (condition)
code to be executed if condition is true;
else
code to be executed if condition is false;
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Example
The following example will output "Have a nice weekend!" if
the current day is Friday, and "Have a nice Sunday!" if the
current day is Sunday. Otherwise it will output "Have a nice
day!":
<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>
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