Drupal migrations reference: List of configuration options for source plugins | Understand Drupal
Ajax Testing in Drupal 8 | Phase2 Technology
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Only variables should be passed by reference [#1329200] | Drupal.org
Using React library on Drupal | Appnovation
Drupal 8 core and Symfony components | ADCI Solutions
Code reference information | PhpStorm
End to End Testing With Drupal and Cypress - Blog - Sevaa Group
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Variables placed in email body not being replaced with actual value [#3056302] | Drupal.org
Filter Entity Reference View with dynamic arguments from Reference Field - Stack Overflow
Drupal 8 Theming Fundamentals, Part 2 | Lullabot
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Only variables should be passed by reference auto_entitylabel_set_title() [#2763941] | Drupal.org
The List of the 10 Most Common Mistakes That PHP Developers Make | Toptal
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Strict warning: Only variables should be passed by reference [#2149287] | Drupal.org
PHP7: "Notice: Only variables should be passed by reference" - WPML
Getting Started with Drupal 8 Migrations | Aten Design Group
How to Use Entity Reference Views in Drupal 8
Drupal 8 Services, Dependency Injection, and Decoupling Your Code | FFW
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Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org
Code reference information | PhpStorm
Setting and Clearing Custom Cache Tags in Drupal 8 | Pantheon Docs
Varnish for Drupal 8 | Dropsolid.io
![Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org](https://www.drupal.org/files/issues/display2.PNG "Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org")
Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org
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Only variables should be passed by reference [#1614450] | Drupal.org
![Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org](https://www.drupal.org/files/issues/display1.PNG "Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org")
Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org
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Only variables should be passed by reference [#2973834] | Drupal.org
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