php给每个段落添加空格的方法

<?php
 //prepends whitespace to each line of a string
 function white_space( $string, $whitespace )
 {
  //create an array from the string, each key having one line
  $string = explode( php_eol, $string );
  //loop through the array and prepend the whitespace
  foreach( $string as $line => $text )
  {
   $string[ $line ] = $whitespace . $text;
  }
  //return the string
  return( implode( php_eol, $string ) );
 }
?>