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   1  <?php
   2  // +----------------------------------------------------------------------+

   3  // | PHP Version 4                                                        |

   4  // +----------------------------------------------------------------------+

   5  // | Copyright (c) 1997-2004 The PHP Group                                |

   6  // +----------------------------------------------------------------------+

   7  // | This source file is subject to version 3.0 of the PHP license,       |

   8  // | that is bundled with this package in the file LICENSE, and is        |

   9  // | available at through the world-wide-web at                           |

  10  // | http://www.php.net/license/3_0.txt.                                  |

  11  // | If you did not receive a copy of the PHP license and are unable to   |

  12  // | obtain it through the world-wide-web, please send a note to          |

  13  // | license@php.net so we can mail you a copy immediately.               |

  14  // +----------------------------------------------------------------------+

  15  // | Authors: Aidan Lister <aidan@php.net>                                |

  16  // +----------------------------------------------------------------------+

  17  //

  18  // $Id: str_split.php,v 1.15 2005/06/18 12:15:32 aidan Exp $

  19  
  20  
  21  /**

  22   * Replace str_split()

  23   *

  24   * @category    PHP

  25   * @package     PHP_Compat

  26   * @link        http://php.net/function.str_split

  27   * @author      Aidan Lister <aidan@php.net>

  28   * @version     $Revision: 1.15 $

  29   * @since       PHP 5

  30   * @require     PHP 4.0.0 (user_error)

  31   */
  32  if (!function_exists('str_split')) {
  33      function str_split($string, $split_length = 1)
  34      {
  35          if (!is_scalar($split_length)) {
  36              user_error('str_split() expects parameter 2 to be long, ' .
  37                  gettype($split_length) . ' given', E_USER_WARNING);
  38              return false;
  39          }
  40  
  41          $split_length = (int) $split_length;
  42          if ($split_length < 1) {
  43              user_error('str_split() The length of each segment must be greater than zero', E_USER_WARNING);
  44              return false;
  45          }
  46          
  47          // Select split method

  48          if ($split_length < 65536) {
  49              // Faster, but only works for less than 2^16

  50              preg_match_all('/.{1,' . $split_length . '}/s', $string, $matches);
  51              return $matches[0];
  52          } else {
  53              // Required due to preg limitations

  54              $arr = array();
  55              $idx = 0;
  56              $pos = 0;
  57              $len = strlen($string);
  58  
  59              while ($len > 0) {
  60                  $blk = ($len < $split_length) ? $len : $split_length;
  61                  $arr[$idx++] = substr($string, $pos, $blk);
  62                  $pos += $blk;
  63                  $len -= $blk;
  64              }
  65  
  66              return $arr;
  67          }
  68      }
  69  }
  70  
  71  ?>