(i) It is used to loop through each KEY value pair in an array.
(ii) It will issue an error when you try to use it on a variable with a different data type or an initialized variable.

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

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

Syntax of for each loop
for each (＄array as ＄value)
{
code to be executed;
}

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

(i) for loop
(ii) for each loop
(iii) while loop
(iv) Do while loop

For each loop is exclusively available in PHP and is mainly used for looping through the values of an array. The loop iteration deepens on each KEY Value pair in the Array. For each, loop iteration the value of the current array element is assigned to $value variable and the array pointer is advanced by one, until it reaches the end of the array element.

'for loop' is called as the entry - for check loop. The for loop is used to execute a block of code a specific number of times.

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.