set_query_var( string $query_var, mixed $value )

User Contributed Notes

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   stode 7 years ago

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   One use case for this is to pass variable to template file when calling it with get_template_part().

   // When calling a template with get_template_part()
   set_query_var('my_form_id', 23);
   get_template_part('my-form-template');

   Now in you template you can then call it.

   // Inside my-form-template.php
   $my_form_id = get_query_var('my_form_id');
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   Anonymous User 5 years ago

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   This is a way to pass variables to the called files.

   On the a.php file:

   $sample = 'a sample variable';
   $year = 2019;
   
   $arr = [
   	'sample' => $sample,
   	'year' => $year
   ];
   
   set_query_var( 'multiVar', $arr );
   get_template_part( 'b' );
   get_template_part( 'c' );

   On the b.php file:

   $arr = get_query_var( 'multiVar' );
   echo $arr['year']; // This will print out: 1995

   On the c.php file:

   $arr = get_query_var( 'multiVar' );
   echo $arr['sample']; // This will print out: a sample variable

   • IMO: Using extract method can help readability, in my case allowed me not rename variables already in use. On the c.php file:

     extract( get_query_var( 'multiVar' ) );  echo $sample; // This will print out: a sample variable 

     Ivo Vicente 5 years ago
   • extract() is regarded as a “terrible function” by WordPress coding standards; please do not use. list() is similar to extract(), and is much more readable.

     crstauf 4 years ago
3. Skip to note 6 content

   jnlr 10 months ago

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   To update examples and avoid spread of set_query_var() in recents projects.
   Lot of them continue to use set_query_var() for passing args/vars to a template with get_template_part().
   Since WordPress 5.5 (08/11/2020), think to use the $args third parameter to passed args to a template or a partial.

   // No example here as this is not the appropriate page
   But for example with get_template_part : https://developer.wordpress.org/reference/functions/get_template_part/#comment-4130

   Doc about passing arguments to template files :
   https://make.wordpress.org/core/2020/07/17/passing-arguments-to-template-files-in-wordpress-5-5/