为什么isset而不是空在此Solarium对象迭代中不起作用
[英]Why isset and not empty doesn't work in this Solarium object iteration
问题描述
我试图在PHP中使用foreach迭代下面的对象，但我没有得到任何结果。
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => 3007WFP
[name] => Dell Widescreen UltraSharp 3007WFP
[manu] => Dell, Inc.
[manu_id_s] => dell
[cat] => Array
(
[0] => electronics and computer1
)
[features] => Array
(
[0] => 30" TFT active matrix LCD, 2560 x 1600, .25mm dot pitch, 700:1 contrast
)
[includes] => USB cable
[weight] => 401.6
[price] => 2199
[price_c] => 2199,USD
[popularity] => 6
[inStock] => 1
[store] => 43.17614,-90.57341
[_version_] => 1.485082319029E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book2
[cat] => Array
(
[0] => fantasy
)
[pubyear_i] => 1996
[title] => Array
(
[0] => A Game of Thrones
)
[author] => George R.R. Martin
[author_s] => George R.R. Martin
[series_s] => A Song of Ice and Fire
[sequence_i] => 1
[_version_] => 1.4850828331521E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book3
[cat] => Array
(
[0] => fantasy
)
[pubyear_i] => 1999
[title] => Array
(
[0] => A Clash of Kings
)
[author] => George R.R. Martin
[author_s] => George R.R. Martin
[series_s] => A Song of Ice and Fire
[sequence_i] => 2
[_version_] => 1.4850828331574E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book4
[cat] => Array
(
[0] => sci-fi
)
[pubyear_i] => 1951
[title] => Array
(
[0] => Foundation
)
[author] => Isaac Asimov
[author_s] => Isaac Asimov
[series_s] => Foundation Series
[sequence_i] => 1
[_version_] => 1.4850828331584E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book5
[cat] => Array
(
[0] => sci-fi
)
[pubyear_i] => 1952
[title] => Array
(
[0] => Foundation and Empire
)
[author] => Isaac Asimov
[author_s] => Isaac Asimov
[series_s] => Foundation Series
[sequence_i] => 2
[_version_] => 1.4850828331605E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book6
[cat] => Array
(
[0] => sci-fi
)
[pubyear_i] => 1992
[title] => Array
(
[0] => Snow Crash
)
[author] => Neal Stephenson
[author_s] => Neal Stephenson
[series_s] => Snow Crash
[_version_] => 1.4850828331616E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book7
[cat] => Array
(
[0] => sci-fi
)
[pubyear_i] => 1984
[title] => Array
(
[0] => Neuromancer
)
[author] => William Gibson
[author_s] => William Gibson
[series_s] => Sprawl trilogy
[sequence_i] => 1
[_version_] => 1.4850828331636E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book8
[cat] => Array
(
[0] => fantasy
)
[pubyear_i] => 1985
[title] => Array
(
[0] => The Black Company
)
[author] => Glen Cook
[author_s] => Glen Cook
[series_s] => The Black Company
[sequence_i] => 1
[_version_] => 1.4850828331647E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => book9
[cat] => Array
(
[0] => fantasy
)
[pubyear_i] => 1965
[title] => Array
(
[0] => The Black Cauldron
)
[author] => Lloyd Alexander
[author_s] => Lloyd Alexander
[series_s] => The Chronicles of Prydain
[sequence_i] => 2
[_version_] => 1.4850828331657E+18
[score] => 1
)
)
Solarium\QueryType\Select\Result\Document Object
(
[fields:protected] => Array
(
[id] => 1
[title] => Array
(
[0] => Getting Started with Solr, a simple Solr Tutorial
)
[description] => The Unofficial Solr Guide: This simple Solr Tutorial covers basic Heliosearch and Apache Solr installation, Solr indexing, Solr search and querying.
[keywords] => solr,tutorial,guide,covers,indexing,search,query,installation,unofficial,apache
[url] => http://heliosearch.org/solr/getting-started/
[_version_] => 1.4850885076533E+18
[score] => 1
)
)
我正在使用以下PHP代码
<?php
if($this->totalResults > 0) {
foreach($this->results as $result) {
//if(!empty($result->title) && !empty($result->url) && !empty($result->description)) {
if(isset($result->title) && isset($result->url) && isset($result->description)) {
?>
<div class="search_result">
<a class="title" href="#">
<?php echo $result->title[0];?>
</a><br/>
<span class="url">
<?php echo $result->url;?>
</span><br/>
<span class="description">
<?php echo $result->description;?>
</span>
</div>
<?php }
}
}?>
我从来没有得到任何结果，但我应该得到最后一个节点，因为它包含标题，网址和描述键。
但是，当我简单地说
if($result->title && $result->url && $result->description) {
然后它工作正常。 为什么它不能在该模式下工作。
2 个解决方案
解决方案1
3 2014-11-18 12:41:55
让我告诉你，isset仅适用于变量而不适用于对象。 请阅读php.net http://php.net/manual/en/function.isset.php上的文档。 我建议阅读页面底部的示例，其中解释了当我们将对象传递给它时，isset总是返回false。
解决方案2
0 2014-11-18 12:16:48
因为这些属性是存在的，但是填充了空字符串或null ...所以isset()对于它们总是如此...如果你不是100％确定，它们总是在那里，你可以组合两个检查(isset($result->title) && $result->title) 。 替代方案可能是(isset($result->title) && !empty($result->title)) ，这应该也适用
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