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PHP

How many types of loops are there in PHP?

January 28, 2020 comments off

While Loop:-
While loop keeps repeating an action until a condition returns false.

<?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;
}
?>
view raw while-loop.php hosted with ❤ by GitHub

Nested While loop:-
Nested while loops work as while loop but in this case, you use one or more while loop condition in one while loop.
ex:-

<?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;
}
}
?>
view raw nested-while-loop.php hosted with ❤ by GitHub

Do While loop:-
Do While loop work as while loop but in this case Before executed then check condition is true then execute next if condition is false then exit.
ex:-

<?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);
?>
view raw do-while-loop.php hosted with ❤ by GitHub

Nested Do While loop:-
Nested Do While loop work as Do While loop but in this case you can add or use one or more do while loop in one parent do while loop.
ex:-

<?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
?>
view raw nested-do-while-loop.php hosted with ❤ by GitHub

For loop :-
For loop is frequently used where you will be a fixed number of times.
ex:-

<?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>";
}
}
?>
view raw for-loop.php hosted with ❤ by GitHub

Nested for loop :-
Nested for loop work like as for loop but one or more for loop in one parent for loop.
ex:-

<?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>";
}
}
?>
view raw nested-for-loop.php hosted with ❤ by GitHub

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