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Only variables should be passed by reference [#2973834] | Drupal.org
Drupal 8 CMI Masterclass | MindMeister Mind Map
drupal-screenshots/common.inc at master · civicrm/drupal-screenshots · GitHub
10 Most Common Mistakes That PHP Developers Make | Toptal
drupal-core-patches/drupal-7.8_to_7.10.patch at master · acquia/drupal-core-patches · GitHub
Creating a Drupal view component with configurable filters | Acquia Cohesion Docs
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Drupal 8 Theming Fundamentals, Part 2 | Lullabot
Drupal 9: An Introduction To Services And Dependency Injection | #! code
media - How can I use function template_preprocess_field() to pass a value from one field to an attribute of another field? - Drupal Answers
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Fix PHP Strict warning: Only variables should be passed by reference. [#2272607] | Drupal.org
Notice: Only variables should be passed by reference en PHP
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Strict warning: Only variables should be passed by reference in workflow_tab_page() [#1418268] | Drupal.org
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Code reference information | PhpStorm
Novedades de PHP 7.*
Drupal 9: Loading All Routes From A Module | #! code
Programmatically updating URL aliases using Batch API in Drupal 8 | QED42
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Only variables should be passed by reference [#1614450] | Drupal.org
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media - How can I use function template_preprocess_field() to pass a value from one field to an attribute of another field? - Drupal Answers
