while and do while Loops In PHP Tutorial Class 21

While and do-while Loops In PHP
Like any other language, loop in PHP is used to execute a statement or a block of statements, multiple times until and unless a specific condition is met. This helps the user to save both time and effort of writing the same code multiple times.
PHP supports four types of looping techniques;

for loop
while loop
do-while loop
for each loop

While Loop
The while loop is also an entry control loop like for loops i.e., it first checks the condition at the start of the loop and if it’s true then it enters the loop and executes the block of statements, and goes on executing it as long as the condition holds true.
Different way to write a while loop syntax:

do-while loop
This is an exit control loop which means that it first enters the loop, executes the statements, and then checks the condition. Therefore, a statement is executed at least once on using the do…while loop. After executing once, the program is executed as long as the condition holds true.
Syntax:
do{
statement(s)
}while(expr);

do-while loops are very similar to while loops, except the truth expression is checked at the end of each iteration instead of in the beginning. The main difference from regular while loops is that the first iteration of a do-while loop is guaranteed to run (the truth expression is only checked at the end of the iteration), whereas it may not necessarily run with a regular while loop (the truth expression is checked at the beginning of each iteration, if it evaluates to FALSE right from the beginning, the loop execution would end immediately).

The meaning of a while statement is simple. It tells PHP to execute the nested statement(s) repeatedly, as long as the while expression evaluates to TRUE. The value of the expression is checked each time at the beginning of the loop, so even if this value changes during the execution of the nested statement(s), execution will not stop until the end of the iteration (each time PHP runs the statements in the loop is one iteration). If the while expression evaluates to FALSE from the very beginning, the nested statement(s) won't even be run once.

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