Chapter: 12th Computer Applications : Chapter 6 : PHP Conditional Statements
PHP Conditional Statements
PHP Conditional Statements:
Like other Programming languages, PHP also allows
to write code that perform different actions based on the results of a logical
or a test Condition. Thus you can create test conditions in the form of
expressions that evaluates to either true or false and based on these results
you can perform certain actions. The following statements in PHP help us to make
decisions:
if
Statement
if...else
Statement
if...elseif....else
Statement
switch Statement
If statement in PHP:
If statement executes a statement or a group of
statements if a specific condition is satisfied as per the users expectation.
This is the simplest PHP’s conditional statement and can be written in the
following form.
Syntax:
if (condition)
{
Statement(s);
}
Example:
<?php
$Pass_Mark=35;
$Student_Mark=70;
if ($Student_Mark>= $Pass_Mark){
echo “The Student is Eligible for the
Promotion”;
}
?>
If else statement in PHP:
The if statement evaluates a condition and executes
a set of code if the condition is true and another set of code if the condition
is false.
Syntax:
if (condition)
{
Statement(s) if condition is true;
}
else
{
Statement(s) if condition is false;
}
Example:
<?php
$Pass_Mark=35;
$Student_Mark=70;
if ($Student_Mark>= $Pass_Mark){
echo “The Student is eligible for the
promotion”;
}
else {
echo “The Student is not eligible for
the promotion”;
}
?>
If elseif else statement in PHP:
If- elseif-else statement is a combination of if
-else statement. Here multiple conditions can be checked and action is based on
the result of the condition.
Syntax:
if (Condition 1)
{
Statement(s) if condition 1 is true;
}
elseif(Condition 2)
{
Statement(s) if condition 2 is true;
}
else
{
Statement(s) if both conditions are
false;
}
Example:
<?php
$Pass_Mark=35;
$first_class=60;
$Student_Mark=70;
if ($Student_Mark>= $first_class){
echo “The Student is eligible for the
promotion with First Class”; }
elseif ($Student_Mark>=
$Pass_Mark){
echo “The Student is eligible for the
promotion”;
}
else {
echo “The Student is not eligible for
the promotion”;
}
?>
Switch Case:
The switch case is an alternative to the if..
elseif..else statement which executes a block of code corresponding to the
match.
Syntax:
switch (n) {
case label1:
code to be executed if n=label1;
break;
case label2:
code to be executed if n=label2;
break;
case label3:
code to be executed if n=label3;
break;
...
default:
code to be executed if n is different
from all labels;
}
Example:
<?php
$favcolor = “red”;
switch ($favcolor) {
case “red”:
echo “Your favorite color is red!”;
break;
case “blue”:
echo “Your favorite color is blue!”;
break;
case “green”:
echo “Your favorite color is green!”;
break;
default:
echo “Your favorite color is neither
red, blue, nor green!”;
}
?>
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