PHP If Else(elsefi) statement_php basics

Conditional statement

When you write code, you often need to perform different actions for different decisions.

You can use conditional statements in your code to accomplish this task.

if...else statement

Execute a block of code when the condition is true, and execute another block of code when the condition is not true
The elseif statement
is used in conjunction with if...else to execute a code block If... when one of several conditions is true. Else Statement
If you want to execute some code when a certain condition is true and other code when the condition is not true, 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;

Example

If the current date is Friday, the following code will output "Have a nice weekend!", otherwise it will output "Have a nice day!":

Copy code The code is as follows:

$d=date("D");
if ($d=="Fri")
echo "Have a nice weekend!";
else
echo "Have a nice day!";
?>

If you need to execute multiple lines of code when a condition is true or false, you should enclose the lines of code in curly braces:

Copy code The code is as follows:

$d=date("D");
if ($d=="Fri")
{
echo "Hello!
";
echo "Have a nice weekend!";
echo "See you on Monday!";
}
?>

ElseIf Statement
If you want to execute code when one of multiple conditions is true, use the elseif statement:

Syntax

Copy code The code is as follows:

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;

Example
If the current date is Friday, the following example will output "Have a nice weekend!", if it is Sunday, it will output "Have a nice Sunday!", otherwise it will output "Have a nice day!" ":

Copy code The code is as follows:

$d=date("D");
if ($d=="Fri")
echo "Have a nice weekend!";
elseif ($d=="Sun" )
echo "Have a nice Sunday!";
else
echo "Have a nice day!";
?>