PHP 正则表达式函数preg_grep()

<?php
   $foods = array("pasta", "steak", "fish", "potatoes");

   // find elements beginning with "p", followed by one or more letters.
   $p_foods = preg_grep("/p(\w+)/", $foods);

   print "Found food is " . $p_foods[0];
   print "Found food is " . $p_foods[1];
?>