Here's the PHP code:
if ($var===0) {do something}
It "does something" only when $var is actually 0 (and if $var is not set, it doesn't work, so everything is OK).
However, Twig doesn't support === operator, and if I write:
{% if var==0 %}do something{% endif %}
it "does something" all the time (even when $var is not set). In order to fix it, I wrote such a code:
{% if var matches 0 %}do something{% endif %}
Is it a proper way to do === comparison in Twig, or I did something wrong here? If it's wrong, how should it be fixed?
You need to use same as in Twig for === comparisons:
{% set var1=0 %}
{% set var2='0' %}
{% if var1 is same as( 0 ) %}
var1 is 0.
{% else %}
var1 is not zero.
{% endif %}
{% if var2 is same as( 0 ) %}
var2 is 0.
{% else %}
var2 is not 0.
{% endif %}
{% if var2 is same as( '0' ) %}
var2 is '0'.
{% else %}
var2 is not '0'.
{% endif %}
Here is a twigfiddle showing it in operation:
https://twigfiddle.com/k09myb
Here is the documentation for same as also stating that it is equivalent to ===. Hope that helps you!
Twig doesn't have === but it has same as instead. See: https://twig.sensiolabs.org/doc/2.x/tests/sameas.html
So you could write:
{% if var is same as(0) %}do something{% endif %}
Eventually, you can use is defined to check whether the variable is set.
I want to add key and value into array in twig file. But I am facing following issue "Twig_Error_Syntax: A hash key must be a quoted string or a number"
{% set phoneCount = 0 %}
{% set phoneNumbers = {} %}
{% for currPhone in currBroker.phones %}
{% if (currPhone.type == 'Work' or currPhone.type == 'Mobile') and phoneCount <= 2 and currPhone.number !='' %}
{% set phoneCount = phoneCount + 1 %}
{% set phoneNumbers = phoneNumbers|merge({ currPhone.type:currPhone.type }) %}
{% endif %}
{% endfor %}
{{ phoneNumbers|print_r }}
I just need the syntax of merging key and value into array.
I tried by giving static inputs and its works
{% set phoneNumbers = phoneNumbers|merge({ 'work':'(011)112-1233' }) %}
But its not working for dynmic input. Please help!!
You have to wrap your key in braces :
{% set phoneNumbers = phoneNumbers|merge({ (currPhone.type) : currPhone.type }) %}
Tested and working example :
{% set currPhone = {type: 'test'} %}
{% set phoneNumbers = {} %}
{% set phoneNumbers = phoneNumbers|merge({ (currPhone.type) : currPhone.type }) %}
{% dump(phoneNumbers) %}
I get :
array:1 [▼
"test" => "test"
]
I have an array like this:
array['a'] = {x => 1, y => 2...}
array['b'] = {x => 5, y => 7...}
I need to iterate over the array, but in each case I need to enter only in the 'a' or 'b' which I choose.
{% for i in main %}
{% set id = i.getId %}
{% for j in array.id %}
//do something like j.propertyA ...
{% endfor %}
{% endfor %}
The fail is always get the error: "The key 'id' for array with keys 'a', 'b'... does not exist"
If I force writting:
{% for j in array.a %}
The program works fine always with array.a but I need to works with all automatically.
Any idea? Thanks :)
Change {% for j in array.id %} to {% for j in array[id] %}
This is because you're trying to access "id" (as is written) directly from array (and isn't defined). With [id] your variable is substitued with its value and so your call will not fail
I think you need array|keys twig filter. See more: http://twig.sensiolabs.org/doc/filters/keys.html.
Is there any way of getting the average value of an array of value just inside a Twig template when using Symfony2?
I tried something like the following code but it doesn't work
{% set sumratings = 0 %}
{% set count = 0 %}
{% for rating in article.ratings %}
{% set sumratings = sumratings + rating.value %}
{% endfor %}
AVG: {{ sumratings / article.ratings.count }}
Any idea?
I think this should do it
{% set sumratings = 0 %}
{% for rating in article.ratings %}
{% set sumratings = sumratings + rating.value %}
{% endfor %}
AVG: {{ sumratings / article.ratings|length }}
Assuming rating.value is an integer
There is no built-in way to do that. Creating your own twig extension that can do it is simple! You need to create a filter, which is very well doumented in the cookbook: How to write a custom Twig Extension.
The answer is correct but horrible to use, right ?
It's simple:
function arrayAverage($array)
{
if (!is_array($array)) return false;
if (!count($array)) return 0;
$avg=0;
foreach ($array as $num) $avg+=$num;
$avg/=count($array);
return $avg;
}
$twig->addFilter('arrayAverage', new Twig_Filter_Function('arrayAverage'));
Now you can just do like this in your twig templates:
{{ somearray | arrayAverage }}
{{ somearray | arrayAverage | number_format }}
In modern Twig versions, there's a reduce() filter that can simplify this work, a bit:
{% set myValues = [1, 2, 3, 4, 5] %}
{% set average = (myValues | reduce((sum, val) => sum + val, 0)) / (myValues | length) %}
{{ average }} {# 3 #}
See this fiddle!
How can I set member of an already existing array from Twig?
I tried doing it next way:
{% set arr['element'] = 'value' %}
but I got the following error:
Unexpected token "punctuation" of value "[" ("end of statement block"
expected) in ...
There is no nice way to do this in Twig. It is, however, possible by using the merge filter:
{% set arr = arr|merge({'element': 'value'}) %}
If element is a variable, surround it with brackets:
{% set arr = arr|merge({(element): 'value'}) %}
I ran into this problem but was trying to create integer indexes instead of associative index like 'element'.
You need to protect your index key with () using the merge filter as well:
{% set arr = arr|merge({ (loop.index0): 'value'}) %}
You can now add custom index key like ('element'~loop.index0)
If initialization only need:
{% set items = { 'apple': 'fruit', 'orange': 'fruit', 'peugeot': 'unknown' } %}
I have tried #LivaX 's answer but it does not work , merging an array where keys are numeric wont work ( https://github.com/twigphp/Twig/issues/789 ).
That will work only when keys are strings
What I did is recreate another array ( temp) from the initial array (t) and make the keys a string , for example :
{% for key , value in t%}
{% set temp= temp|merge({(key~'_'):value}) %}
{% endfor %}
t keys : 0 , 1 , 2 ..
temp keys : 0_, 1_ , 2_ ....
You can also use the following syntax:
{% set myArray = myArray + myArray2 %}
Just use this like {% set arr={'key':'value'} %} (with no blank space after the :), it works well.
But when I use it inside a for loop, to make it an array, it does not work outside of the for scope.
{% for group in user.groups %}
{% set foo={'loop.index0':'group.id'} %}
{% set title={'loop.index0':'group.title'} %}
{{ title }} //it work
{% else %}
{% set foo={'0':'-1'} %}
{% set title={'0':'未分组'} %}
{% endfor %}
{{ title }} //it does not work, saying title is not defined
{% set links = {} %}
{# Use our array to wrap up our links. #}
{% for item in items %}
{% set links = links|merge({ (loop.index0) : {'url': item.content['#url'].getUri(), 'text': item.content['#title']} }) %}
{% endfor %}
{%
set linkList = {
'title': label,
'links': links
}
%}
{% include '<to twig file>/link-list.twig'%}
Thanks for this thread -- I was also able to create an array with (loop.index0) and send to twig.
I've found this issue very annoying, and my solution is perhaps orthodox and not inline with the Twig philosophy, but I developed the following:
$function = new Twig_Function('set_element', function ($data, $key, $value) {
// Assign value to $data[$key]
if (!is_array($data)) {
return $data;
}
$data[$key] = $value;
return $data;
});
$twig->addFunction($function);
that can be used as follows:
{% set arr = set_element(arr, 'element', 'value') %}
Adding my answer in case anyone needs to update the array when merge doesn't work because it just appends to the end of an array instead of providing the ability to change an existing value.
Let's say you have an array words_array like below:
Object {
0: "First word"
1: "Second word"
2: "Third word"
}
In order to update "Second word", you can do the following:
{% set words_array = {(1): 'New word'} + words_array %}
The resulting array would be:
Object {
0: "First word"
1: "New word"
2: "Third word"
}
You can take it one step further if you are using a loop and use the loop.index0 variable something like the following:
{% for word in words_array %}
{% if word == 'Second word' %}
{% set words_array = {(loop.index0): 'New word'} + words_array %}
{% endif %}
{% endfor %}
You can declare the array as follows
{% set arr = [{'element1': 'value1','element2' : 'value2'},{'element1': 'value1','element2' : 'value2'},{'element1': 'value1','element2' : 'value2'}] %}
I had a multi dimension array. The only solution I could find out is create a new temporary array and update/add the information, which was further passed on to another twig function.
I had this problem sometime ago. Imagine you have an array like this one:
data = {
'user': 'admin',
'password': 'admin1234',
'role': 'admin',
'group': 'root',
'profile': 'admin',
'control': 'all',
'level': 1,
'session': '#DFSFASADASD02',
'pre_oa': 'PRE-OA',
'hepa_oa': 'HEPA-OA',
'pre_ra': 'HEPA-RA',
'hepa_ra': 'HEPA-RA',
'deodor_ra': 'DEODOR-RA'
}
So, you want to show this data in two rows, but remove the password from that list. To this end, split in 2 arrays will be easy with the slice filter. However, we have to remove the password. For that reason, I'm using this snippet. The idea is to put all the elements lesser than the data elements size divided by 2. To calculate this we use the filter length. Now to get the index of the current element we user loop.index. And finally we *push an associative element in the left or right array. An associative array has two components key and value. To reference an array key in twit we operator () and we use the merge filter to push into the array as shown here {% set left_list = left_list|merge({ (key): value }) %}
This is the complete solution.
{% set left_list = {} %}
{% set right_list = {} %}
{% set limit = data|length // 2 %}
{% for key, value in data|cast_to_array %}
{% if key != 'password' %}
{% if loop.index <= limit %}
{% set left_list = left_list|merge({ (key): value }) %}
{% else %}
{% set right_list = right_list|merge({ (key): value }) %}
{% endif %}
{% endif %}
{% endfor %}
{% for key, value in left_list %}
<p>
<label for="{{key}}">{{key}}</label>
<input type="text" name="{{key}}" id="{{key}}" value="{{value}}"
class="text ui-widget-content ui-corner-all">
</p>
{% endfor %}