自动生成数组(Range())

<?php
  //产生array(0,1,2,3,4,5)
  foreach(range(0,5) as $number)
   {
     echo $number;
   }
  echo"<br>";
 
  //array(0,10,20,30,40) 这里设置了步长(step)参数
  foreach(range(0,40,10) as $number)
   {
     echo $number;
   }
  echo "<br>";

  //产生字符数组
  //array('a','b','c','d');
  foreach(range('a','d') as $letter)
   {
     echo $letter;
   }
  echo "<br>";
 
  //array('c','b','a')第1个参数大于第2个参数
  foreach(range('c','a') as $letter)
   {
     echo $letter;
   }
?>

输出结果: