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2012年(4)

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分类: Python/Ruby

2012-04-01 15:47:19


substr()用法如下

  1. $value = substr($string, $offset, $count);
  2. $value = substr($string, $offset);
  3. substr($string, $offset, $count) = $newstring;
  4. substr($string, $offset, $count, $newstring); # same as previous
  5. substr($string, $offset) = $newtail;


$value = substr($string, $offset, $count);

  1. $string = "good good start, day day up!";
  2. substr($string, 0, 4) = "bad";
  3. print $string;
    result
  1. bad good start, day day up!


$value = substr($string, $offset, $count,$newstring);
  1. $string = "good good start, day day up!";
  2. substr($string, 5, 4, "bad");
  3. print $string;

result

  1. good bad start, day day up!

 
 

$value = substr($string, $offset);
  1. $string = "good good start, day day up!";
  2. substr($string, 0) = "bad";
  3. print $string;

result

  1. bad

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