Full code fragment that perform REPEATED ACTIONS until a desired result is reached.
Behavior while loops are the simplest type of loops in PHP.
This function works as its analog in C language.
<?php
// STRUCTURE #1
while( expr )
statement
where,
expr = expression to be evaluated
statement = code to be executed
?>
<?php
// STRUCTURE #2
while ( expr )
{
statement
}
where,
expr = expression to be evaluated
statement = code to be executed
?>
<?php
// STRUCTURE #3
while ( expr ):
statement
. . . . . . . . . .
endwhile;
where,
expr = expression to be evaluated
statement = code to be executed
?>
EXERCISE
<?php
$n01 = 2;
while ($n01 <= 9)
echo $n01++ . ' ';
?>
EXERCISE
<?php
$n02 = 2;
while ($n02 <= 9):
echo $n02++ . ' ';
endwhile;
?>
EXERCISE
<?php
$n03 = [ 2, 8, 18, 32, 32, 18, 8 ];
$n03i = -1;
$n03e = (count($n03) - 1);
while ($n03i < $n03e):
$n03i++;
echo $n03[$n03i] . ' ';
endwhile;
?>
EXERCISE
<?php
$n = 0;
$n04 = [ 2, 8, 18, 32, 32, 18, 8 ];
while ($n < count($n04))
{
echo $n04[$n] . ' ';
$n++;
}
?>
EXERCISE
<?php
$nb = 'K';
$ne = 'Q';
$n05 = [ 'K' => 2, 'L' => 8,
'M' => 18, 'N' => 32,
'O' => 32, 'P' => 18,
'Q' => 8 ];
while ($nb <= $ne)
{
echo '\'' . $nb . '\' => ' . $n05[$nb] . '<br>';
$nb++;
}
?>