Question

如果孩子的attritbutes是空的，我试图删除一个节点。

XML是一个带有simpleXML的http请求，我无法在此处粘贴。因此我从网址粘贴了一些XML文档：

XML

<game id="1421692" status="Pre-Game" summary="1:00 PM" PreRegPost="Regular Season" PreRegPostID="2" GameDate="11/2/2014 1:00:00 PM">
<HomeTeam HomeTeam="Vikings" HomeTeamAbr="Min" HomeTeamID="16" HomeScore="0" Home_Outcome="undecided">HomeTeam</HomeTeam>
<AwayTeam AwayTeam="Redskins" AwayTeamAbr="Was" AwayTeamID="28" AwayScore="0" Away_Outcome="undecided">AwayTeam</AwayTeam>
game
</game>
<game id="" status="" summary="" PreRegPost="" PreRegPostID="2" GameDate="">
<HomeTeam HomeTeam="" HomeTeamAbr="" HomeTeamID="16" HomeScore="" Home_Outcome="">HomeTeam</HomeTeam>
<AwayTeam AwayTeam="" AwayTeamAbr="" AwayTeamID="" AwayScore="" Away_Outcome="">AwayTeam</AwayTeam>
game
</game>
<game id="1421668" status="Pre-Game" summary="1:00 PM" PreRegPost="Regular Season" PreRegPostID="2" GameDate="11/16/2014 1:00:00 PM">
<HomeTeam HomeTeam="Bears" HomeTeamAbr="Chi" HomeTeamID="3" HomeScore="0" Home_Outcome="undecided">HomeTeam</HomeTeam>
<AwayTeam AwayTeam="Vikings" AwayTeamAbr="Min" AwayTeamID="16" AwayScore="0" Away_Outcome="undecided">AwayTeam</AwayTeam>
game
</game>

PHP

  foreach ($game->{'info-schedule'}[0]->game as $games) {
    //Get the Date and Time for the game
    $time = $games->attributes()->GameDate;
    //Get the HomeTeam Data
    $hometeam = $games->HomeTeam->attributes()->HomeTeamAbr;
    $hometeamscore = $games->HomeTeam->attributes()->HomeTeamScore;
    //Get the AwayTeam Data
    $awayteam = $games->AwayTeam->attributes()->AwayTeamAbr;
    $awayteamscore = $games->AwayTeam->attributes()->AwayTeamScore;
    //Change TimeZone
    $playtime = new DateTime($time, new DateTimeZone('America/Los_Angeles'));
    $playtime->setTimezone(new DateTimeZone('Europe/Copenhagen'));


        $playtimes .= "<li class='time'>".$playtime->format('d/m - H:i')."</li>";
        $versus .= "<li class='versus'>".$hometeam."<span class='HomeTeamScore'>".$hometeamscore."</span><span class            ='AwayTeamScore'>".$awayteamscore."</span>".$awayteam."</li>";


  }

HTML

<div class="results">
<ul>
<?php echo $playtimes; ?>
</ul>
<ul>
<?php echo $versus; ?>
</ul>
</div>

我的输出电流如下：

02/11 - 22:00 / MinWas
16/06 - 00:37 /         //This is supposed to come out all empty
16/11 - 22:00 / ChiMin

问题在于，在空节点中，它会自动输出我的本地时间，即使它是空的。

如何转换或删除该空节点？

PS。这是我的第二个foreach循环 - 所以不要判断它：）

Answer 1

如果远程队伍不存在，请使用continue关键字跳过迭代。

foreach ($game->{'info-schedule'}[0]->game as $games) {
    //Get the Date and Time for the game
    $time = $games->attributes()->GameDate;
    //Get the HomeTeam Data
    $hometeam = $games->HomeTeam->attributes()->HomeTeamAbr;
    $hometeamscore = $games->HomeTeam->attributes()->HomeTeamScore;

    if (empty($games->AwayTeam->attributes()->AwayTeamAbr)) {
        continue;
    }

    //Get the AwayTeam Data
    $awayteam = $games->AwayTeam->attributes()->AwayTeamAbr;

    $awayteamscore = $games->AwayTeam->attributes()->AwayTeamScore;
    //Change TimeZone
    $playtime = new DateTime($time, new DateTimeZone('America/Los_Angeles'));
    $playtime->setTimezone(new DateTimeZone('Europe/Copenhagen'));


    $playtimes .= "<li class='time'>".$playtime->format('d/m - H:i')."</li>";
    $versus .= "<li class='versus'>".$hometeam."<span class='HomeTeamScore'>".$hometeamscore."</span><span class            ='AwayTeamScore'>".$awayteamscore."</span>".$awayteam."</li>";
}

Answer 2

您只需要进行简单的验证检查即可确定是否处理foreach迭代。根据我的理解，您可以在添加结果之前检查$hometeam是否为空（未设置，空白，空，零，假等）。如果使用continue()：

为空，则会完全跳过迭代

foreach ($game->{'info-schedule'}[0]->game as $games) {
    if(empty($hometeam))
        continue;

    // rest of your code
}

你应该记住的是，像这样的大型连接很好但是有点乱，你应该考虑使用这样的数组：

$play_time = array();
$versus = array();

foreach ($game->{'info-schedule'}[0]->game as $games) {
    if(empty($hometeam))
        continue;

    // rest of your code
    $play_time[] = "<li class='time'>".$playtime->format('d/m - H:i')."</li>";
    $versus[] = "<li class='versus'>".$hometeam."<span class='HomeTeamScore'>".$hometeamscore."</span><span class='AwayTeamScore'>".$awayteamscore."</span>".$awayteam."</li>";

}

然后您输出如下（使用implode()）（注意：您可以使用\n或PHP_EOL分隔符让您的输出在源代码中更清晰一些）：

<div class="results">
    <ul>
        <?php echo implode($play_time); ?>
    </ul>
    <ul>
        <?php echo implode($versus) ?>
    </ul>
</div>

另一方面也注意到，使用sprintf()调用将格式化内容插入字符串中可能更容易表达HTML块：

$pt_format = '<li class="time">%s</li>';
$vs_format = '<li class="versus">%s<span class="HomeTeamScore">%s</span><span class="AwayTeamScore">$s</span>$s</li>';

foreach ($game->{'info-schedule'}[0]->game as $games) {
    if(empty($hometeam))
        continue;

    // rest of your code
    $play_time[] = sprintf($pt_format, $playtime->format('d/m - H:i'));
    $versus[] = sprintf($vs_format, $hometeam, $hometeamscore, $awayteamscore, $awayteam);
}

只是一个想法:)这样更容易阅读。

如果XML中的项为空，则为PHP

2 个答案: