Help with replace, please help.

[nasium]

Hey all! I am really stuck here and could use some help. Im having troubles replacing text inside of a string. I am trying to loop through an array of names and wrapping html around the value if its found. Everything works great untill I do a for each???

Heres the example:
function stri_replace($replacer,$replacement,$string) {
$lowercase_replacer = strtolower($replacer);

// Make all the words we are replacing lowercase
$string = str_replace($replacer,$lowercase_replacer,$string);

// Replace all occurences
$string = str_replace($lowercase_replacer,$replacement,$string);

return $string;
}

$contents = "frost frost2 frost3 frost4";
$prog = explode(" ", trim($contents));

while (list(, $value) = each ($prog)) {
echo "Value: $value<br>\n";
$replacer = $value;
$replacement = "<a href=$value>$value</a>";
$string = "frost is the best.";
$final_value = stri_replace($replacer,$replacement,$string);
}
print ("$final_value");

What I get:

Value: frost
Value: frost2
Value: frost3
Value: frost4
frost is the best.

What the heck is going on?

[the_Igel]

while (list(, $value) = each ($prog)) {
echo "Value: $value<br>\n";
$replacer = $value;
$replacement = "<a href=$value>$value</a>";
$string = "frost is the best.";
$final_value = stri_replace($replacer,$replacement,$string);
}

The string gets assigned on every iteration. And final_value too.
In case you want to do consequently all five replaces, you should write:

$string = '.............';
while(............)
{
....................
$string = stri_replace($replacer, $replacement, $string);
}
echo $string;

[nasium]

right, i get it. Duh!

[the_Igel]

preg_replace('/(frost|frost2|frost3|frost4|frost5)/', '<a href="\1">\1</a>', $string);