PHP While Loop

PHP while loop can be used to traverse set of code like for loop.

It should be used if number of iteration is not known.

Syntax

Alternative Syntax

Flowchart

Example

Output:

1
2
3
4
5
6
7
8
9
10

Alternative Example

Output:

1
2
3
4
5
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7
8
9
10

PHP Nested While Loop

We can use while loop inside another while loop in PHP, it is known as nested while loop.

In case of inner or nested while loop, nested while loop is executed fully for one outer while loop. If outer while loop is to be executed for 3 times and nested while loop for 3 times, nested while loop will be executed 9 times (3 times for 1st outer loop, 3 times for 2nd outer loop and 3 times for 3rd outer loop).

Example

Output:

1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3