Description
Computers are great at crunching piles of data, and piles of data usually takes the form of sequences, streams, tables and so on. Such data sets usually need to be iterated over. At the very least, some statements may need to be executed more than once. Loops in C++ and iteration statements are used for this purpose.
Block of code executing until the conditions false is called as a
loop.PHP While loop can be of different categories like
- While Loop
- do…while
Description
PHP While loop is considered when it is unknown how many times to execute.
Compiler only checks the condition is true or false.The While loop executes the statement only when the expression becomes True. After the statement is executed, it will once again evaluate the expression and repeat as needed.
Example
[php]
<!DOCTYPE html>
<html>
<body>
<?php
$x = 15;
while($x <= 30) {
echo "X value is: $x<br>";
$x++;
}
?>
</body>
</html>
[/php]
Output:
Description
Here first the controller executes the block of code, then it will check the condition of the loop and it will repeats the loop till the condition becomes false.
Examples
[php]
<!DOCTYPE html>
<html>
<body>
<?php
$x=15;
do{
echo "X value is: $x <br>";
$x++;
} while($x<=30);
?>
</body>
</html>
[/php]
Output:
Key Points
- Loops performs repeated execution to make a condition become true.
- While loop executes after the condition becomes true.
- Do-while loop executes at least once even if the condition is false.