Conditional statement in PHP
PHP supports different types of conditional statements:-
PHP supports different types of conditional statements:-
The
if Statement
In if Statements
Output will appear when only Condition must be true.
The
if-else Statement
if-else statements
allows you to display output in both the condition(if condition is true display
some message otherwise display other message).
The
if-elseif-else
Statement
The if-else-if-else
statement lets you chain together multiple if-else statements, thus allowing
the programmer to define actions for more than just two possible outcomes.
The
switch Statement
The switch statement
is similar to a series of if statements on the same expression.
if statement in PHP
—The if Statement is the simplest conditional statements.
—In if Statements Output will appear when only
Condition must be true.
—If Statement works much like the English language
statement, “if X happens, then do Y.”
Write a program to check even number.(Number entered by
user)
<?php
if(isset($_GET['save']))
{
if($_GET['n']%2==0)
{
echo
$_GET['n']." is even number";
}
}
?>
<body>
<form method="get">
Enter Your number<input type="text"
name="n"/><hr/>
<input type="submit" value="check
number" name="save"/>
</form>
</body>
if else statement in PHP
—The if statement is quite basic because in If statement
output will display when condition must be true, if condition is false it
display nothing(blank).
—But if-else statements allows you to display output in both
the condition(if condition is true display some message otherwise display
other message).
—In English, this statement would read, “if
X happens, do Y; otherwise do Z”.
check if given number is greater than 0, then show number
is
positive else number is negative.
<?php
$num=$_POST['n'];
if($num>0)
{ echo $num." is positive number"; }
else
{ echo $num." is negative number"; }
?>
<body>
<form method="post">
Enter Your number<input type="text"
name="n"/><hr/>
<input type="submit" value="check
number"/>
</form>
</body>
nested if else in PHP
The if-else-if-else statement lets
you chain together multiple if-else statements, thus allowing the programmer to define
actions for more than just two possible outcomes.
Check given character is vowel or consonant.
<body>
<form method="post">
Enter Your
number<input type="text" name="ch"/><hr/>
<input
type="submit"/>
</form>
</body>
<?php
$char=$_POST['ch'];
if($char=="a")
{ echo $char." is vowel"; }
elseif($char=="e")
{ echo $char." is vowel"; }
elseif($char=="i")
{ echo $char." is vowel"; }
elseif($char=="o")
{ echo $char." is vowel"; }
elseif($char=="u")
{ echo $char." is vowel"; }
else
{ echo $char. "is consonent"; }
?>
switch statement in php
—The switch statement is similar to a series of if statements on
the same expression.
—The following two examples are two different ways to
write the same thing, one using a series of if and else-ifstatements, and the other using the switch statement.
Check whether the value matches with the given value or
not.
<?php
$i=5;
switch ($i)
{
case 0: echo
"i equals 0";
break;
case 1: echo “i equals 1";
break;
case 2: echo
"i equals 2";
break;
default: echo
"i is not equal to 0, 1
or 2";
}
?>
Output : 5 is not equal to 0, 1 or 2