Episode 9: Using while loops

A while loop continues repeating as long as certain conditions are true. The loop works as follows:

1. You set up a condition.

2. The condition is tested at the top of each loop.

3. If the condition is true, the loop repeats. If the condition is not true, the loop stops.

The following is the general format of a while loop:

while ( condition )

{

block of statements

}

The following statements set up a while loop that looks through an array for an apple:

$fruit = array ( “orange”, “apple”, “grape” );

$testvar = “no”;

$k = 0;

while ( $testvar != “yes” )

{

if ($fruit[$k] == “apple” )

{

$testvar = “yes”;

echo “apple\n”;

}

else

{

echo “$fruit[$k] is not an apple\n”;

}

$k++;

}

These statements generate the following output:

orange is not an apple

apple

Written by “Shojib”.