困惑使用OR，str_replace，数组还是什么？

I have a code that finds the words Alabama and Michigan inside $l and return the if condition:

<?php if (trim($l) == "Alabama" || trim($l) == "Michigan"): ?>
   <a href="http://www.example.com/"><?= $l ?></a>
 <?php else: ?>
   <a href="http://www.example.com/"></a>
<?php endif; ?>

Sometimes I don't have Alabama and Michigan inside $l but I have AL and MI that are related to Alabama and Michigan and in that case I want replace AL and MI with Alabama and Michigan. If I want to do it inside the code above to write a clean and short code, how should I do it? I have a lot more words to match and associate them together so please give me a clean code.

you could use a regexp as

  if(preg_match('(Michigan|Alaska|MI|AL)', $l) === 1) {

    ........

   } 

in Your case

<?php if (preg_match('(Michigan|Alaska|MI|AL)', $l) === 1): ?>
   <a href="http://www.example.com/"><?= $l ?></a>
 <?php else: ?>
   <a href="http://www.example.com/"></a>
<?php endif; ?>

or for replace

<?php 
  $short = ["MI", "AL"];
  $long   = ["Michigan", "Alaska"];

  $newl = str_replace($short, $long, $l);
?>
<?php if (preg_match('(Michigan|Alaska)', $newl) === 1): ?>

   <a href="http://www.example.com/"><?= $newl ?></a>
 <?php else: ?>
   <a href="http://www.example.com/"></a>
<?php endif; ?>