以下foreach循环显示一个额外的空字段。它具有类似于foreach的html标记，但不会从数据库加载任何内容。数据库中没有多余的空字段，我查了一下。
// content
$content = "SELECT * FROM `lb_content` WHERE catid = 13";
$contentcon = $conn->query($content);
$contentcr = array();
while ($contentcr[] = $contentcon->fetch_array());
foreach($contentcr as $content)
{
$article_images = $content['images']; // Get image parameters of the article
$pictures = json_decode($article_images); // Split the parameters apart
$contentje .= '<li class="job_listing">
<a href="http://www.website.nl/_extern/website/content.php?alias='.$content['alias'].'">
<div class="location job_img">
<img name="images" src="/_extern/website/cms/'.$pictures->{'image_intro'}.'" alt="" class="company_logo">
</div>
<div class="location boldfont">
'.$content['title'].'
</div>
<div class="location specificaties">
'.$content['introtext'].'
</div>
<div class="rating location">
<div class="rating-stars">
<i class="fa fa-star"></i>
<i class="fa fa-star"></i>
<i class="fa fa-star"></i>
<i class="fa fa-star"></i>
<i class="fa fa-star"></i>
</div>
</div>
<div class="location prijs">
'.$content['metakey'].'
<br>
<div class="cursief">Vanaf 2 weken</div>
</div>
<div class="location">
<button type="submit" class="btn btn-primary buttonblock" onClick="location.href="http://www.website.nl/_extern/website/content.php?page="'.$content['alias'].'">Nu huren</button>
</div>
</a>
</li>'; // Here
}
echo $contentje;
这是一张带有最后一个工作区和一个额外工作区的图像。额外的空场来自哪里？
这是数组输出的一部分，因为您可以看到数组值“6”为空。
[5] =>
De ideale tijdelijke oplossing voor o.a.:
Grotere kantoren
Middelgrote winkels
Serverruimtes
Transformator ruimtes
Feest tenten
Meet- en regelkamers
Hotels
Restaurants
Conferentieruimtes
Laboratoria
Koelcapaciteit
: 13,0 KW
Voeding
: 230 V / 1 Fase / 50 Hz
Opgenomen vermogen per set
: 4,82 kW
Nominale stroomsterkte
: 3 x 7,6 A
Afzekerwaarde
: 3 x 20 A T
Max. Leidinglengte
: 40 m
Max. Hoogteverschil
: 25 m
Koelleiding diameters
: 3/8 - 3/4 inch
Voorzien van winterregeling
: (-15 °C)
Binnenunit specificaties:
Luchtvolume
: 900 / 1200 m3/h
Benodigde condensaansluiting
: met ingebouwde condenspomp
Geluidsniveau (laag / hoog)*
: 42 / 51 dB(A)
Gewicht
: 50 kg
Afmetingen unit (HxBxD)
: 1750 x 540 x 300 mm
Buitenunit specificaties:
Geluidsniveau
: 58 dB(A)
Gewicht
: 75 kg
Afmetingen (HxBxD)
: 950 x 840 x 412 mm
Voeding
: voorzien van een CEE stekker, 32A, 5-polig
[fulltext] =>
De ideale tijdelijke oplossing voor o.a.:
Grotere kantoren
Middelgrote winkels
Serverruimtes
Transformator ruimtes
Feest tenten
Meet- en regelkamers
Hotels
Restaurants
Conferentieruimtes
Laboratoria
Koelcapaciteit
: 13,0 KW
Voeding
: 230 V / 1 Fase / 50 Hz
Opgenomen vermogen per set
: 4,82 kW
Nominale stroomsterkte
: 3 x 7,6 A
Afzekerwaarde
: 3 x 20 A T
Max. Leidinglengte
: 40 m
Max. Hoogteverschil
: 25 m
Koelleiding diameters
: 3/8 - 3/4 inch
Voorzien van winterregeling
: (-15 °C)
Binnenunit specificaties:
Luchtvolume
: 900 / 1200 m3/h
Benodigde condensaansluiting
: met ingebouwde condenspomp
Geluidsniveau (laag / hoog)*
: 42 / 51 dB(A)
Gewicht
: 50 kg
Afmetingen unit (HxBxD)
: 1750 x 540 x 300 mm
Buitenunit specificaties:
Geluidsniveau
: 58 dB(A)
Gewicht
: 75 kg
Afmetingen (HxBxD)
: 950 x 840 x 412 mm
Voeding
: voorzien van een CEE stekker, 32A, 5-polig
[6] => 1
[state] => 1
[7] => 13
[catid] => 13
[8] => 2015-11-30 10:28:23
[created] => 2015-11-30 10:28:23
[9] => 361
[created_by] => 361
[10] =>
[created_by_alias] =>
[11] => 2015-12-08 13:14:13
[modified] => 2015-12-08 13:14:13
[12] => 361
[modified_by] => 361
[13] => 0
[checked_out] => 0
[14] => 0000-00-00 00:00:00
[checked_out_time] => 0000-00-00 00:00:00
[15] => 2015-11-30 10:28:23
[publish_up] => 2015-11-30 10:28:23
[16] => 0000-00-00 00:00:00
[publish_down] => 0000-00-00 00:00:00
[17] => {"image_intro":"images\/website\/AELIA_30_45.jpg","float_intro":"","image_intro_alt":"","image_intro_caption":"","image_fulltext":"","float_fulltext":"","image_fulltext_alt":"","image_fulltext_caption":""}
[images] => {"image_intro":"images\/website\/AELIA_30_45.jpg","float_intro":"","image_intro_alt":"","image_intro_caption":"","image_fulltext":"","float_fulltext":"","image_fulltext_alt":"","image_fulltext_caption":""}
[18] => {"urla":false,"urlatext":"","targeta":"","urlb":false,"urlbtext":"","targetb":"","urlc":false,"urlctext":"","targetc":""}
[urls] => {"urla":false,"urlatext":"","targeta":"","urlb":false,"urlbtext":"","targetb":"","urlc":false,"urlctext":"","targetc":""}
[19] => {"show_title":"","link_titles":"","show_tags":"","show_intro":"","info_block_position":"","show_category":"","link_category":"","show_parent_category":"","link_parent_category":"","show_author":"","link_author":"","show_create_date":"","show_modify_date":"","show_publish_date":"","show_item_navigation":"","show_icons":"","show_print_icon":"","show_email_icon":"","show_vote":"","show_hits":"","show_noauth":"","urls_position":"","alternative_readmore":"","article_layout":"","show_publishing_options":"","show_article_options":"","show_urls_images_backend":"","show_urls_images_frontend":""}
[attribs] => {"show_title":"","link_titles":"","show_tags":"","show_intro":"","info_block_position":"","show_category":"","link_category":"","show_parent_category":"","link_parent_category":"","show_author":"","link_author":"","show_create_date":"","show_modify_date":"","show_publish_date":"","show_item_navigation":"","show_icons":"","show_print_icon":"","show_email_icon":"","show_vote":"","show_hits":"","show_noauth":"","urls_position":"","alternative_readmore":"","article_layout":"","show_publishing_options":"","show_article_options":"","show_urls_images_backend":"","show_urls_images_frontend":""}
[20] => 14
[version] => 14
[21] => 0
[ordering] => 0
[22] => € 195
[metakey] => € 195
[23] =>
[metadesc] =>
[24] => 1
[access] => 1
[25] => 0
[hits] => 0
[26] => {"robots":"","author":"","rights":"","xreference":""}
[metadata] => {"robots":"","author":"","rights":"","xreference":""}
[27] => 0
[featured] => 0
[28] => *
[language] => *
[29] =>
[xreference] =>
)
[5] => Array
(
[0] => 16
[id] => 16
[1] => 84
[asset_id] => 84
[2] => Aelia 55 (AL-55)
[title] => Aelia 55 (AL-55)
[3] => aelia-55-al-55
[alias] => aelia-55-al-55
[4] =>
Type
: AL-55
Koelvermogen
: 18,0 Kw
Afvoervermogen
: Zuilkoeling staand model
Ruimtes tot
: 520m3
[introtext] =>
Type
: AL-55
Koelvermogen
: 18,0 Kw
Afvoervermogen
: Zuilkoeling staand model
Ruimtes tot
: 520m3
[5] =>
[fulltext] =>
[6] => 1
[state] => 1
[7] => 13
[catid] => 13
[8] => 2015-11-30 10:38:11
[created] => 2015-11-30 10:38:11
[9] => 361
[created_by] => 361
[10] =>
[created_by_alias] =>
[11] => 2015-12-09 14:07:30
[modified] => 2015-12-09 14:07:30
[12] => 361
[modified_by] => 361
[13] => 361
[checked_out] => 361
[14] => 2015-12-09 14:07:30
[checked_out_time] => 2015-12-09 14:07:30
[15] => 2015-11-30 10:38:11
[publish_up] => 2015-11-30 10:38:11
[16] => 0000-00-00 00:00:00
[publish_down] => 0000-00-00 00:00:00
[17] => {"image_intro":"images\/website\/AELIA_55.jpg","float_intro":"","image_intro_alt":"","image_intro_caption":"","image_fulltext":"","float_fulltext":"","image_fulltext_alt":"","image_fulltext_caption":""}
[images] => {"image_intro":"images\/website\/AELIA_55.jpg","float_intro":"","image_intro_alt":"","image_intro_caption":"","image_fulltext":"","float_fulltext":"","image_fulltext_alt":"","image_fulltext_caption":""}
[18] => {"urla":false,"urlatext":"","targeta":"","urlb":false,"urlbtext":"","targetb":"","urlc":false,"urlctext":"","targetc":""}
[urls] => {"urla":false,"urlatext":"","targeta":"","urlb":false,"urlbtext":"","targetb":"","urlc":false,"urlctext":"","targetc":""}
[19] => {"show_title":"","link_titles":"","show_tags":"","show_intro":"","info_block_position":"","show_category":"","link_category":"","show_parent_category":"","link_parent_category":"","show_author":"","link_author":"","show_create_date":"","show_modify_date":"","show_publish_date":"","show_item_navigation":"","show_icons":"","show_print_icon":"","show_email_icon":"","show_vote":"","show_hits":"","show_noauth":"","urls_position":"","alternative_readmore":"","article_layout":"","show_publishing_options":"","show_article_options":"","show_urls_images_backend":"","show_urls_images_frontend":""}
[attribs] => {"show_title":"","link_titles":"","show_tags":"","show_intro":"","info_block_position":"","show_category":"","link_category":"","show_parent_category":"","link_parent_category":"","show_author":"","link_author":"","show_create_date":"","show_modify_date":"","show_publish_date":"","show_item_navigation":"","show_icons":"","show_print_icon":"","show_email_icon":"","show_vote":"","show_hits":"","show_noauth":"","urls_position":"","alternative_readmore":"","article_layout":"","show_publishing_options":"","show_article_options":"","show_urls_images_backend":"","show_urls_images_frontend":""}
[20] => 8
[version] => 8
[21] => 0
[ordering] => 0
[22] => € 235
[metakey] => € 235
[23] =>
[metadesc] =>
[24] => 1
[access] => 1
[25] => 0
[hits] => 0
[26] => {"robots":"","author":"","rights":"","xreference":""}
[metadata] => {"robots":"","author":"","rights":"","xreference":""}
[27] => 0
[featured] => 0
[28] => *
[language] => *
[29] =>
[xreference] =>
)
[6] =>
答案 0 :(得分：1)
无论如何，行while ($contentcr[] = $contentcon->fetch_array());将继续访问数据库结果并将某些内容放入数组中。
您拥有的是$contentcr中的最后一个数组索引实际为FALSE，因为它无法再收集结果集。仍然会返回一些内容，但不会返回结果集。
您的数组看起来像：
$contentcr[0] = array(...);
$contentcr[1] = array(...);
$contentcr[n-1] = array(...);
$contentcr[n] = FALSE;
这就是为什么你总是以空场结束。
您可以通过将foreach($contentcr as $content)行替换为while ($content = $contentcon->fetch_array())来更好地解决此问题。这将在$contentcon->fetch_array()为假时停止，并且不会为您提供空字段