Syntax of Do while loop
do
{
code to be executed;
} while (condition is true);

Syntax of 'for loop'
for (init counter; test counter; increment counter)
{
code to be executed;
}

Loop structures in PHP is an iterative control structures that involves executive the same block of code a specified number of times. Loops that iterate for fixed no of times is also called as Bounded loops.

(i) PHP Loop Often when you write code, you want the same block of code to run over and over again in a row.
(ii) Instead of adding several almost equal code-lines in a script, we can use loops to perform a task.
(iii) Looping structures are useful for writing iteration logics.
(iv) It is the most important feature of many programming languages, including PHP.

1. The array concepts in looping structure is used in for each loop.
2. For each loop is exclusively available in PHP. It works only with arrays.
3. The loop iteration depends on each KEY value pair in the array. In for each, loop iteration the value of the current array element is assigned to $value variable and the array pointer is shifted by one until it reaches the end of the array element.
4. For each works only on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable.
Syntax:
for each ($ array as $ value)
{
code to be executed;
}
1. The for each statement is used to loop through arrays.
2. 'For each' pass the value of the current array element is assigned to $value and the array pointer is moved by one and in the next pass next element will be processed.
Example:
$array = array (1, 2, 3);
{
echo "Value is $value
";
}
?>
Output:
Value is 1
Value is 2
Value is 3

Do while loop always run the statement inside of the loop block at the first time of execution. Then it checks the condition whether true or false. It executes the loop, if the specified condition is true.
Syntax:
do
{
code to be executed;
} while (condition is true);
Example
\(\$\)Student_count = 10;
\(\$\)student_number= 1;
do
{
echo "The student number is: \(\$\)student_number
";
\(\$\)student_number++ ;
}
while(\(\$\)student_number< = \(\$\)Student_count);
?>