PHP - foreach loop
To understand FOREACH loops you
have to remember what we learned
about arrays. If you recall an
array (unlike a variable) contains
a group of data. When using a loop
with an array, instead of having a
counter that goes until proven
false the FOREACH loop continues
until it has used all values in
the array. So for example if an
array contained 5 pieces of data,
then the FOREACH loop would
execute 5 times. More uses for
arrays and FOREACH loops will
become apparent when you start
importing data from MySQL.
A FOREACH loop
is phrased like this: FOREACH
(array as value) { what to do; }
Here is an example of a FOREACH
loop:
<?php
$a = array(1, 2, 3, 4, 5);
foreach ($a as $b)
{
print $b . " ";
}
?> |
Once you understand that
concept you can then use the
FOREACH loop to do more practical
things. Let's say an array
contains the ages of 5 family
members. Then we will make a
FOREACH loop that will determine
how much it costs for each of them
to eat on a buffet that has varied
prices based on age. We will use
the following pricing system:
Under 5 is free, 5-12 years costs
$4 and over 12 years is $6.
<?php
$t = 0;
$age = array(33, 35, 13, 8,
4);
foreach ($age as $a)
{
if ($a < 5)
{$p = 0;}
else
{
if ($a <12)
{$p = 4;}
else
{$p = 6;}
}
$t = $t + $p;
print "$" . $p . "<br>";
}
print "The total is: $" . $t;
?> |
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