How to have foreach contains dynamic element - php

Question

Here is my Foreach, How can i assign different class each time consequently
Here is what i have tried so far.
<?php
$class1="one";
$class2="two";
$class3="three";
$class4="four";
foreach ($blogs as $blog)
{
echo $blog->val;
echo $class;
}
?>
Here the foreach behaves regular as it might contain any number of records.
But i need to assign the $class as one, two, three, four consecutively (which is defined above the foreach).
How can i do this ?

Answer 1

Start by defining $class as an array
$class = array(
"one",
"two",
"three",
"four",
);
Iterate your blogs array retrieving the key as well
foreach ($blogs as $key => $blog) {
....
}
Then use the modulus operator % against the $key value within your loop to identify each entry from $class in turn
foreach ($blogs as $key => $blog) {
echo $blog->val;
echo $class[($key % 4)];
}
Use the modulus with a division by 4 because there are 4 entries in your $class array

Answer 2

For the sake of completeness, there are two more approaches; both use $classes containing all the possible values. First is a slight variation of #MarkBaker's answer:
$classes = array('one', 'two'/*, ...*/);
$length = count($class);
$i = 0;
foreach($blogs as $blog) {
echo $blog->val;
echo $classes[$i];
if (++$i === $length) {
$i = 0;
}
}
Second makes the $classes check as direct as possible - through array_chunk():
foreach (array_chunk($blogs, count($classes)) as $blogs_chunk) {
foreach($blogs_chunks as $key => $blog) {
echo $blog->val;
echo $classes[$key];
}
}
In this case it's not necessary to check for overflow/modalize because each chunk contains not more than count($classes) elements.