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What is the use of PHP explain with syntax?

What is PHP?
PHP: Hypertext Preprocessor(Recursive Acronym)
Server Side Programming/Scripting Language
Can be embedded directly within HTML (<?php ?>)
Files use a “.php” file extension.

If… statement:-

<?php
$a = 5;
if ($a >1)
{
echo "this is if.. statement"; //if this is true then print if wrong then blank
}
?>

if… and nested if :-

<?php
if(10<12)
{
echo "this is right <br>"; //when true total echo print and when wrong then wrong statement print one or more
if (22>21)
{
echo "this is too right<br>";
}
if (45<40)
{
echo "this is false <br>";
}
if(44>30)
{
echo "this is wrong <br>";
}
}
echo "this is end";
?>

if…else Statement:-

<?php
$a = 4; //before check condition if condition is true then print if wrong the print false
if ($a < 1) {
echo "This is True";
} else {
echo "This is False <br>";
}
//second example
$a = 4;
if ($a < 6) {
echo "This is True!";
} else {
echo "This is False";
}
?>

if…elseif…else Statement:-

<?php
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";
?>

While Loop:-

<?php
//while loop
$value = 1;
while($value <= 5) //before check if conditon is true then executed if wrong then exit
{
echo "this is while loop : $value <br>";
++$value;
}
?>

Nested While loop:-

<?php
#nested while loop
$a = 3;
while ($a <= 4) //before check if conditon is true then executed internal parts with check internal while loop conditions
//if wrong then exit
{
echo "this is example $a <br>";
++$a;
$b = 4;
while ($b <= 5)
{
echo "val $b <br>";
++$b;
}
}
?>

Do While loop:-

<?php
$a = 5;
do //before executed after condition check
{
echo "this is do while loop $a <br>";
$a++;
} while ($a <= 6);
//second example
$b = 3;
do
{
echo "this is do... while loop $a <br>";
++$b;
} while ($b <= 5);
?>

Nested Do While loop:-

<?php
$a = 4; //before executed after condition check but one or more
do
{
echo "this is first $a <br>";
$a++;
$b = 5;
do
{
echo "this is second $b <br>"; //first check
++$b;
} while ($b <= 7);
} while ($a<= 6); //second check
?>

For loop :-

<?php
for ($a = 2; $a< 5; ++$a) // before check if conditon is true then print and check next if condition is false then exit
{
echo "this is for loop <br>";
}
//second example
for ($b = 3; $b< 6; ++$b)
{
echo "for <br>";
for ($c = 4; $c <7; ++$c)
{
echo "nested for <br>";
}
}
?>

Nested for loop :-

<?php
//Nested for loop
for ($b = 3; $b< 6; ++$b) // before check if conditon is true then print and check next if condition is false then exit
{
echo "for <br>";
for ($c = 4; $c <7; ++$c)
{
echo "nested for <br>";
}
}
?>

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