Do-while loop is an exit condition loop because it checks the condition after the block is executed, the control structure is often also known as a past-test loop.

When we write the code if we want the same block of code to run over and over again. lnstead of adding several almost equal code-lines in a script, we can use loops to perform a task.

There are three parameters used in 'for loop' They are init counter, test counter, and increment counter.
(i) Init counter is used to initialize the counter value.
(ii) Test counter is evaluated for every iteration of the loop.
(iii) Increment counter is used to increases the loop counter value.

This loop is used to iterate over arrays. For every counter of loop, an array element is assigned and the next counter is shifted to the next element.

While:
\(\$\)num=2;
While (\(\$\)num!=2)
{
echo"code to be skipped in while";
echo $num, "\n";
}
?>
Do While:
\(\$\)num = 2;
do{
\(\$\)num++;
echo"code is executed at least once";
} while (\(\$\)num==2);
?>
Output: While loop executes only when the condition is true. In do While loop the code is executed at least once.

0utput:
123456789101112
The value of \(\$\)x is incremented and printed twice before checking, therefore the last loop it prints 11 and 12.

1. PHP while loops execute a block of code while the specified condition is true.
2. The for loop is used when you knew in advance how many times the script should run.
3. The foreach loop works only en arrays, and is used to loop through each key/value pair in an array.
4. do ... while - loops through a block of code once, and then repeats the loop as long as the specified condition is true.

The number is: 1
The number is: 2
The number is: 3
The number is: 4
The number is: 5
Program:
< ?php
＄ x = 1;
de {
echo "The number is: ＄x
";
＄x++;
} while (＄x < = 5);
? >

< ?php
scolors = array("red", "qreen", "blue'; "yellew'');
fereach (sectors as ＄value)
{
echo "svalue < br >";
}
? >

< ?php
for (＄x = 0; ＄x < = 5; ＄x++)
{
 echo "Hello World < br >";
}
? >

< ?php
＄x = 1;
while(＄x < = 10)
{
echo sx:
＄x++;
}
? >