Question

我正在使用差异算法（the Paul Butler one），我现在有点工作了。我发现我需要mysql_fetch_array（）而不是mysql_fetch_object（），它解决了警告和错误消息，但现在当我尝试print_r（）显示结果时，结果只是“数组”而不是数据库中的字段我需要它来显示和比较...当我调用一个不同的函数时，它似乎显示字段，但不比较它们而不是列出它们两次并在它之前使用Array ( [0] => Array ( [d] => Array ( [0] =>。

知道为什么吗？是的，我已经用Google搜索并查了一下，花了大约两天的时间试图解决它。

以下是脚本的部分内容：

    $oldhistory = mysql_query("SELECT history FROM members WHERE id = '$id'") or die(mysql_error());
    $oldhistory = mysql_fetch_array($oldhistory);

    $newhistory = mysql_query("SELECT history FROM profile_edit WHERE userid = '$id'") or die(mysql_error());   
    $newhistory = mysql_fetch_array($newhistory);

    $oldpersonality= mysql_query("SELECT personality FROM members WHERE id = '$id'") or die(mysql_error());
    $oldpersonality = mysql_fetch_array($oldpersonality);

    $newpersonality = mysql_query("SELECT personality FROM profile_edit WHERE userid = '$id'") or die(mysql_error());   
    $newpersonality = mysql_fetch_array($newpersonality);

    $oldappearance = mysql_query("SELECT description FROM members WHERE id = '$id'") or die(mysql_error());
    $oldappearance = mysql_fetch_array($oldappearance);

    $newappearance = mysql_query("SELECT personality FROM profile_edit WHERE userid = '$id'") or die(mysql_error());    
    $newappearance = mysql_fetch_array($newappearance);

    echo "
      <form action=\"$PHP_SELF?id=$id&s=a\" method=\"post\">
      <table cellpadding=\"5\" cellspacing=\"1\" border=\"0\" align=\"center\" bgcolor=\"#234904\">
        <tr bgcolor=\"#000000\">
         <td>History :: </td>
         <td> 
";

function diffhistory($oldhistory, $newhistory){

foreach($oldhistory as $oindex => $ovalue){
        $nkeys = array_keys($newhistory, $ovalue);
        foreach($nkeys as $nindex){
            $matrix[$oindex][$nindex] = isset($matrix[$oindex - 1][$nindex - 1]) ?
                $matrix[$oindex - 1][$nindex - 1] + 1 : 1;
            if($matrix[$oindex][$nindex] > $maxlen){
                $maxlen = $matrix[$oindex][$nindex];
                $omax = $oindex + 1 - $maxlen;
                $nmax = $nindex + 1 - $maxlen;
            }
        }   
    }
    if($maxlen == 0) return array(array('d'=>$oldhistory, 'i'=>$newhistory));
    return array_merge(
        diffhistory(array_slice($oldhistory, 0, $omax), array_slice($newhistory, 0, $nmax)),
        array_slice($newhistory, $nmax, $maxlen),
        diffhistory(array_slice($oldhistory, $omax + $maxlen), array_slice($newhistory, $nmax + $maxlen)));
}

function htmlDiffHistory($oldhistory, $newhistory){
    $diffhistory = diffhistory(explode(' ', $oldhistory), explode(' ', $newhistory));
    foreach($diffhistory as $k){
        if(is_array($k))
            $ret .= (!empty($k['d'])?"<del><color=red>".implode(' ',$k['d'])."</color></del> ":'').
                (!empty($k['i'])?"<ins><color=green>".implode(' ',$k['i'])."</color></ins> ":'');
        else $ret .= $k . ' ';
    }
    return $ret;

}
print_r (diffhistory($oldhistory, $newhistory));

Answer 1

您可能只需要使用mysql_fetch_assoc()（或可能mysql_fetch_row()）将数据从数据库中读取为关联或索引而不是两者，但我怀疑您的方法存在缺陷 - 一方面，你要做6个查询。您还将单个值数组传递给我怀疑期望两个多个值数组进行比较的函数。

请尝试使用此功能（已编辑，基于以下评论）：

<?php

  function diff($old, $new){
    $maxlen = 0;
    foreach ($old as $oindex => $ovalue) {
      $nkeys = array_keys($new, $ovalue);
      foreach ($nkeys as $nindex) {
        $matrix[$oindex][$nindex] = isset($matrix[$oindex - 1][$nindex - 1])
          ? $matrix[$oindex - 1][$nindex - 1] + 1
          : 1;
        if ($matrix[$oindex][$nindex] > $maxlen) {
          $maxlen = $matrix[$oindex][$nindex];
          $omax = $oindex + 1 - $maxlen;
          $nmax = $nindex + 1 - $maxlen;
        }
      } 
    }
    return ($maxlen == 0)
      ? array(array('d'=>$old, 'i'=>$new))
      : array_merge(
          diff(array_slice($old, 0, $omax), array_slice($new, 0, $nmax)),
          array_slice($new, $nmax, $maxlen),
          diff(array_slice($old, $omax + $maxlen), array_slice($new, $nmax + $maxlen)));
  }

  function htmlDiff($old, $new){
    $ret = '';
    $diff = diff(preg_split('/\s+/', $old), preg_split('/\s+/', $new));
    foreach ($diff as $k) {
      if (is_array($k)) {
          $ret .= (!empty($k['d']) ? "<del style='color:red'>".implode(' ',$k['d'])."</del> " : '')
                . (!empty($k['i']) ? "<ins style='color:green'>".implode(' ',$k['i'])."</ins> " : '');
      } else {
        $ret .= $k . ' ';
      }
    }
    return $ret;
  }

  $query = "
    SELECT
      `m`.`history`, `p`.`history` AS 'p_history',
      `m`.`personality`, `p`.`personality` AS 'p_personality',
      `m`.`description`, `p`.`description` AS 'p_description'
    FROM `members` `m`
    JOIN `profile_edit` `p` ON `p`.`userid` = `m`.`id`
    WHERE `m`.`id` = '".mysql_real_escape_string($id)."'
    LIMIT 1
  ";

  $result = mysql_query($query) or die(mysql_error());
  $data = mysql_fetch_assoc($result);

  echo "
    <form action=\"$PHP_SELF?id=$id&s=a\" method=\"post\">
      <table cellpadding=\"5\" cellspacing=\"1\" border=\"0\" align=\"center\" bgcolor=\"#234904\">
        <tr bgcolor=\"#000000\">
          <td>History :: </td>
          <td>".htmlDiff(htmlspecialchars($data['history']), htmlspecialchars($data['p_history']))."</td>
        </tr>
        <tr bgcolor=\"#000000\">
          <td>Personality :: </td>
          <td>".htmlDiff(htmlspecialchars($data['personality']), htmlspecialchars($data['p_personality']))."</td>
        </tr>
        <tr bgcolor=\"#000000\">
          <td>Description :: </td>
          <td>".htmlDiff(htmlspecialchars($data['description']), htmlspecialchars($data['p_description']))."</td>
        </tr>
      </table>
    </form>";

Answer 2

尝试使用var_dump进行打印，如果它仅用于数组中的验证数据：

echo '<pre>'; var_dump($yourArray); echo'</pre>';

print_r（）函数将结果作为diff算法的简单“Array”返回

2 个答案: