Twig set variable if

Found a typo or an error? Want to improve this document? Edit it. Need support or have a technical question? Ask support on Stack Overflow. Inside code blocks you can also assign values to variables. Assignments use the set tag and can have multiple targets. Here is how you can assign the bar value to the foo variable:. After the set call, the foo variable is available in the template like any other ones:.

The assigned value can be any valid Twig expression :. If you enable automatic output escaping, Twig will only consider the content to be safe when capturing chunks of text. Note that loops are scoped in Twig; therefore a variable declared inside a for loop is not accessible outside the loop itself:.

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You are reading the documentation for Twig 2. Switch to the documentation for Twig 1. Twig documentation is licensed under the new BSD license. Here is how you can assign the bar value to the foo variable: 1.

Caution If you enable automatic output escaping, Twig will only consider the content to be safe when capturing chunks of text. Note Note that loops are scoped in Twig; therefore a variable declared inside a for loop is not accessible outside the loop itself: 1 2 3 4 5.In your Twig templates, it is often good practice to test if a variable or value exists before trying to display it on your page.

There are several different tests you can use. At first glance, it can be quite confusing which is the appropriate test for your needs. As you prepare to output a variable in your template, you need to ask two questions: 1. Does the variablewhich holds the value you want to use, exist?

If the variable exists, does the variable have a value for you to display? In the next section, we will go into several ways to test for the existence of content within a variable.

To test if an attribute exists within a variableuse the defined test and be sure to use array syntax for your variable :. Craft does a good job at suppressing these warnings on your live site when devMode is disabled but you have higher standards.

Enable devMode to see all the warnings your code is throwing and get them corrected. However, variables may not exist for several reasons. Becoming comfortable with when you need to test for existence will help you understand the data you are working with more intimately; write clean, DRY code; and create less problems for yourself down the road.

There are more options to choose from when trying to determine if a variable has a value. We use the term value here to mean any type of content that your variable may contain.

This includes strings, numbers, arrays, objects, booleans, and null. We can combine the above tests to first check if a variable exists and then confirm the variable has a value:. How can you tell if a variable exists? To test if a variable exists, use the defined test. How can you tell if a variable has a value? This can help you determine if a variable has a value or not.

The results of length filter and empty tests are the same. Don't miss any Craft tips, tricks, and community updates Email.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

twig set variable if

It only takes a minute to sign up. How do I loop through entries and set a variable if there are any duplicates in the data I'm checking? In my case, I need to check if there are more than one entry per year. The variable I'm setting will be used in a conditional later in the template. This can be accomplished by creating an array of the entry years. Inside the loop that's building the array, a conditional checks if the year already exists in the array You could use Craft's group filter:.

twig set variable if

Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How do I set a variable in Twig if a value exists more than once in a loop?

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Ask Question. Asked 5 years, 1 month ago. Active 5 years, 1 month ago. Viewed 57k times. Active Oldest Votes.

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Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Featured on Meta. Feedback on Q2 Community Roadmap. Related 3. Hot Network Questions. Question feed.Content verification of variables in Twig can be pretty hard without the dump extension. Even with it, sometimes you will be lazy and you will assume the content of some variables sent from PHP to Twig, as usual a variable can be empty and according to it, you may want to do something different like printing other text etc.

Any developer is used to the is empty test:. If the value of the variable is an empty string or null, the text printed will be "The variable is empty".

As well you may want to check if a property inside an array is empty:.

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In this case, variable exists and the name key is defined, so it will print "The variable is not empty". However what if the variable from where you want to verify if the key exists doesn't exist? You may need to extend your if with:. In this case as our variable doesn't exist, it will print "The variable is not defined or is not empty". A little bit messy and long isn't?

Even ignoring that you don't want to show the message to your user that the variable is not defined but only "The variable is empty". What if I told you that there's an easier way to do it? Using the default filter! Using the default filter you can easily verify if a variable exists and is not empty simultaneously:.

In this case the filter verifies first if the variable "variable" exists, if it does, continues with the key in this case name, if it exists and is not empty, it returns true so the first message would be printed. By the otherside as mentioned, if the key exists but its value is empty, the condition will return false:.

twig set variable if

Which in this case will print "The variable is empty". To learn more about the default filterdon't forget to read the official documentation of the filter in the Twig webpage.

Interested in programming since he was 14 years old, Carlos is the founder and author of most of the articles at Our Code World. Proud Self-taught programmer.Twig is a template engine for the PHP programming language. Its syntax originates from Jinja and Django templates. The initial version was created by Armin Ronacher. In this article, we'll share a collection of 10 tips and basics that every developer should know how to manipulate in Twig.

twig set variable if

Twig allow you to manipulate multiple values in variables. You can use a dot. Note that if a property contains special characters as dots or minus : myVariable. Twig support this feature too and you can even execute inline operations with variable as concatenation and math :. Note: If you want to interpolate use always double quotes ""if you use single quotes '' the interpolation will be not used.

Tutoriel PHP/Twig : Moteur de template Twig

They are also not available when looping with a condition. Although the else tag is useful, you can check if a variable is iterable using the is iterable statement:. Sometimes, when using nested loops, you need to access the parent context. The parent context is always accessible via the loop. For instance, if you have the following template data:. If you have an existing block which is located in other file i.

If you don't still get it, read the following article to understand completely how parent works. Twig supports awesome string shortcuts for basic and frequently tasks with strings and cool functions like starts and ends with :. However, not all in the life is starts or ends with.

Sometimes there are more complex mechanisms of comparison that you'll need to implement according to your needs and you'll probably solve with Regex.

However, you can prevent this behaviour easily. Twig allow you to clean unnecessary spaces between tags of 2 ways :. Control whitespace on a per tag level, allow you to remove spaces from everything you print. To use it include a minus symbol after and before respectively of any print tag :. While the spaceless tag allow you to print an HTML block without spaces which provides a minifier effect :. There are many cases where you want to truncate a string to prevent unwanted behaviours.

To cut a string with a default length use the slice filter. Macros are comparable with functions in regular programming languages.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I know this is really trivial and not that important but it could save me some lifetime You know you can declare variables in PHP in a if block.

Instead I have to make it this way check if the object has an image, if yes save it to new variable and do some stuff with it. Of course I know this is no first world problem and you may think my question is useless but I have to write those "longer" statements many times a day so I could be few minutes faster in the end. So is there a syntax that allows me to set variables in an if block instead of comparing them? No, there is no way to declare a variable inside an if tag.

Variables can only be set using the set tag. You can use check here for more help :.

10 Twig tips and basic features that every developer should know

Learn more. Asked 3 years, 1 month ago. Active 3 years, 1 month ago. Viewed 6k times.

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Robin Schambach Robin Schambach 1 1 gold badge 9 9 silver badges 19 19 bronze badges. Can you post a real life examplewithout "and so on", to make your problem more apparent? YourCommonSense I don't know why it should be important what I do after that Active Oldest Votes. What a pity, thank you. Anubarak other persons tried to solve the problem. But, like I said, you don't want to solve a problem but only to show off.

Not that I am blaming you for that but I'd like to ask you not to blame people who tried to help. I don't see how you tried to help me Honestly I don't really get what you mean with "other persons tried to solve the problem" I just wanted to know if there is a syntax for it or not. I appreciate the help from DarkBee since he tried to create me a workaround. True, I did not take the time to fully understand the question, indeed!

I was too focused on how to find the answer. How can one find the answer if he does not see the question? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

How to check if a variable exists and it's not empty with Twig using a short syntax

Post as a guest Name.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

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If you don't want to use the default filter i. You can then override the page variable in the page block in your child template, by setting the value and then calling parent :. Note that in the parent template, we define the page variable outside of the page block, while in the child template we define it inside the page block.

See a working example here.

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Do be aware that this can become more complicated when you start adding multiple layers of inheritance e. If you simply want a variable to be 'overridable' from a subtemplate you can set your variable in the parent like so:.

I think that works nicely for most situations. Rather than forcing the parent var to be overridden by the child, the parent 'lets' the variable be overridden by children. You could also define different behaviour in the parent such as concatenation rather than overriding. One other approach is to see twig configuration globally in your application.

For example in Silex:. Use set tag with embed. Learn more. Set variable in parent scope in Twig Ask Question. Asked 6 years, 5 months ago. Active 1 year, 3 months ago.