我有一个来自Instagram API的数据数组。我已经知道如何获得低分辨率值来打印页面上的图像。但是由于某些原因，我无法获得标题值。
下面你可以看到我的TWIG代码。图片链接很好，但为什么我不能得到文本?我从symfony得到的错误是:
无法在default/geo .html中访问null变量上的属性("text")。第23行
{% for value in images_array %}
<article class="col-md-3">
<img src="{{ value.images.low_resolution.url }}" alt="" class="thumbnail img-responsive" />
<p>{{ value.caption.text }}</p>
</article>
{% endfor %}下面是从Instagram引入的数据的第一个索引。
Array
(
[0] => Array
(
[attribution] =>
[tags] => Array
(
[0] => style
[1] => fashion
[2] => millinery
[3] => simonandmary
[4] => cvp
[5] => lfw
[6] => doghousestudios
[7] => lfw15
[8] => londonfashionweek
[9] => charleyvanpurpz
[10] => hat
)
[location] => Array
(
[latitude] => 51.5122299
[name] => BFC Show Space, Brewer Street Car Park, London
[longitude] => -0.13417
[id] => 1014693484
)
[comments] => Array
(
[count] => 0
[data] => Array
(
)
)
[filter] => Normal
[created_time] => 1443003740
[link] => https://instagram.com/p/7-DcwVrY3J/
[likes] => Array
(
[count] => 0
[data] => Array
(
)
)
[images] => Array
(
[low_resolution] => Array
(
[url] => https://scontent.cdninstagram.com/hphotos-xfa1/t51.2885-15/s320x320/e35/11881754_1044165445613821_1998401000_n.jpg
[width] => 320
[height] => 320
)
[thumbnail] => Array
(
[url] => https://scontent.cdninstagram.com/hphotos-xpf1/t51.2885-15/s150x150/e35/c6.0.1068.1068/10809626_1642110999378208_443887411_n.jpg
[width] => 150
[height] => 150
)
[standard_resolution] => Array
(
[url] => https://scontent.cdninstagram.com/hphotos-xfa1/t51.2885-15/s640x640/sh0.08/e35/11881754_1044165445613821_1998401000_n.jpg
[width] => 640
[height] => 640
)
)
[users_in_photo] => Array
(
[0] => Array
(
[position] => Array
(
[y] => 0.98366013
[x] => 0.078125
)
[user] => Array
(
[username] => brad_hobbs
[profile_picture] => https://scontent.cdninstagram.com/hphotos-xaf1/t51.2885-19/s150x150/11849014_1659972384225731_1340681672_a.jpg
[id] => 1376238
[full_name] => Brad Hobbs
)
)
[1] => Array
(
[position] => Array
(
[y] => 0.98366013
[x] => 0.934640519
)
[user] => Array
(
[username] => doghousestudios
[profile_picture] => https://scontent.cdninstagram.com/hphotos-xfa1/t51.2885-19/10731472_1576813469216190_1504144557_a.jpg
[id] => 1544718516
[full_name] => Doghouse Studios
)
)
[2] => Array
(
[position] => Array
(
[y] => 0.128686798
[x] => 0.6046875
)
[user] => Array
(
[username] => simonandmary
[profile_picture] => https://scontent.cdninstagram.com/hphotos-xfp1/t51.2885-19/10954789_372599292911615_195833317_a.jpg
[id] => 309223601
[full_name] => Simon and Mary
)
)
)
[caption] => Array
(
[created_time] => 1443003740
[text] => In My Fav Felt Dip Dyed Monza By @simonandmary My Fav Hat Brand Right About Now Thanks To @doghousestudios For The Introduction ☺️🙏🏾. 📷: @brad_hobbs 👌🏾. Day4 #LFW #londonfashionweek #LFW15 #Fashion #Style #CVP #CharleyVanPurpz #Hat #SimonandMary #doghousestudios #millinery
[from] => Array
(
[username] => charleyvanpurpz
[profile_picture] => https://igcdn-photos-h-a.akamaihd.net/hphotos-ak-xfa1/t51.2885-19/s150x150/11311163_951968284859623_331958112_a.jpg
[id] => 54462914
[full_name] => Charley Purpz
)
[id] => 1080316135090261762
)
[type] => image
[id] => 1080316130803682761_54462914
[user] => Array
(
[username] => charleyvanpurpz
[profile_picture] => https://igcdn-photos-h-a.akamaihd.net/hphotos-ak-xfa1/t51.2885-19/s150x150/11311163_951968284859623_331958112_a.jpg
[id] => 54462914
[full_name] => Charley Purpz
)
)我猜不是每个迭代中的value都有caption。如果是，请尝试:
{% if value.caption is defined %}
<p>{{ value.caption.text }}</p>
{% endif %}
或必要时(如caption可以不定义text):
{% if value.caption is defined and value.caption.text is defined %}
<p>{{ value.caption.text }}</p>
{% endif %}
参考:http://twig.sensiolabs.org/doc/tests/defined.html