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PHP

How to declare conditional statements in PHP with example?

January 24, 2020 comments off

When You write a code different actions for different conditions. Then, You can use Conditional statements in your code to do this.

If Statement:-
If Statement executes some code when one condition is true.
ex:-

<?php
$a = 5;
if ($a < 6) {
echo "Have a good day!";
}
//Second example
if(15<19) //
{
echo "condition is true <br>";
}
else {
echo "this is true <br>";
}
echo "this is last <br>";
?>
view raw if-statement.php hosted with ❤ by GitHub

If …else Statement:-
 If …. else Statement executes similar if statement when one condition is true and another condition is false.
ex:-

<?php
$a = 4;
if ($a < 1) {
echo "This is True"; //check statement if right then print if wrong then next
} else {
echo "This is False <br>";
}
//second example
$a = 4;
if ($a < 6) {
echo "This is True!";
} else {
echo "This is False";
}
?>
view raw if-else-if.php hosted with ❤ by GitHub

If…elseif…else Statement:-
If…elseif…else Statement executes different codes when for more than than two or multiple codes.
ex:-

<?php
//elseif statement
if(5>7)
{
echo "this is wrong"; //check statement if right then print if wrong then next check
}
elseif(8>9)
{
echo "this is again wrong";
}
elseif(9>12)
{
echo "this is too wrong";
}
else
echo "this is last";
echo "<br>";
//second example
$price = 20;
if ($price < 10)
{
echo "this is not right ";
}
elseif ($price < 20)
{
echo "this is again not right";
}
elseif ($price < 20)
{
echo "this is too not right";
}
else
echo "this is end";
?>
view raw if-elseif-else.php hosted with ❤ by GitHub

Switch Statement:-
 Switch Statement executes one of many Statement when true.
ex:-

<?php
$value = 20;
switch ($value)
{
case 10:
echo "this is first";
break;
case 20:
echo "this is second";
break;
case 30:
echo "this is third";
break;
default:
echo "this is final";
}
echo "<br>";
$value = 10;
switch ($value)
{
case 11:
echo "Monday <br>";
break;
case 12:
echo "Tuesday <br>";
break;
case 10:
echo "Sunday <br>";
break;
default:
echo "End day <br>";
}
$value = "Saturday";
switch ($value)
{
case "Monday":
echo "Office <br>";
// break;
case "Tuesday":
echo "Office <br>";
// break;
case "Saturday":
echo "Party night <br>";
// break;
default:
echo "Party day <br>";
}
?>
view raw switch-statement.php hosted with ❤ by GitHub

If and nested if:-
 If and nested if multiple code executes when true total statement print and when wrong then wrong statement print.
ex:-

<?php
// (if and nested if statement example)
if (30>2): //when true total echo print and when wrong then wrong statement print
echo "this is true <br>";
endif;
echo "this is wrong <br>";
if (50>55):
echo "this is true <br>";
endif;
echo "this is wrong";
echo "<br>";
echo "<br>";
echo "<br>";
// second method type
if(10<12)
{
echo "this is right <br>";
if (22>21)
{
echo "this is right too <br>";
}
// echo "this is wrong too";
if (45<40)
{
echo "this is not right <br>";
}
if(44>30)
{
echo "this is wrong <br>";
}
}
echo "this is end";
?>
view raw if-and-nested-if.php hosted with ❤ by GitHub

If… else… nested…if:-

<?php
//if else
if(12>14){
echo "this is right <br>";
}
else
{
echo "this is too right <br>";
}
echo "this is wrong <br>";
//if else nested if
if(15>14){
echo "this is start <br>";
if(17>18){
echo "this is first <br>";
}
else {
echo "this is first else <br>";
}
}
else{
echo "this is second else <br>";
}
//if else nested if
if(15>16){
echo "this is start <br>";
if(17>18){
echo "this is first <br>";
}
else {
echo "this is first else <br>";
}
}
else{
echo "this is second else <br>";
}
?>
view raw if-else-nested-if.php hosted with ❤ by GitHub

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