stripos kills my script but strpos is fine?

[Michael <phpnews@xxxxxxxxxxx>]

I'm trying to use stripos as a faster and less resource-intensive 
alternative to preg_match with the i flag, but I'm getting some strange 
behavior.

Here's a test script that demonstrates the problem:
---
<?php
$days = array("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun");
foreach ($days as $d) {
    echo "Checking day: $d";
    if (stripos($d, 'T') === 0) {
        echo "Day is Tuesday or Thursday";
    } else {
        echo "Day is MWFSS";
    }
}
?>
---
When I run this as-is, it prints "Checking day: Mon" and stops. When I 
change stripos to strpos, it runs all the way through doing what it's 
supposed to. It's as if stripos calls 'die' somehow and strpos doesn't.

AFAIK, stripos should behave exactly like strpos except 
case-insensitively. So in the function above, it should make absolutely 
no difference which one I use.

Any thoughts?

Thanks!

PS: Ignore the fact I'm using days above, what I'm really doing has 
nothing to do with date handling. That was just a convenient example to 
demonstrate the problem.

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