[wp-trac] [WordPress Trac] #43379: Allow themes to know if they are the parent or child theme

[WordPress Trac]

#43379: Allow themes to know if they are the parent or child theme
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 Reporter:  denvercoder9     |       Owner:
     Type:  feature request  |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Themes           |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by denvercoder9):

 Not quite, is_child_theme just lets you know if a child theme is in use if
 a child theme is in use it resolves true, if not it resolves false. In my
 use case is_child_theme would always resolve true because I'm looking for
 functionality specific to a parent/child  environment.

 I think my example clearly explains.. let me expand

 Thefunctionality im looking for
 {{{#!php
 <?php

 //in both functions.php files (both as in parent and child)
 $base = is_parent_theme() ? get_template_dir() : get_stylesheet_dir();

 //in parent theme's functions.php
 require_once($base . '/config/image_sizes.php);

 //in child theme's functions.php
 require_once($base . '/config/image_sizes.php);
 }}}

 As it exists presently you have to do...
 parent theme's functions.php
 {{{#!php
 <?php
 $base = get_template_dir();
 require_once($base . '/config/image_sizes.php);
 }}}

 child theme's functions.php
 {{{#!php
 <?php
 $base = get_stylesheet_dir();
 require_once($base . '/config/image_sizes.php);
 }}}

 In this usecase I can prevent users cloning my theme for a child theme
 from having to update get_template_dir references to get_stylesheet_dir
 references. My example is extremely basic on purpose to prove a point. You
 could easily accomplish that specific functionality with __DIR__, but
 that's just because my example demonstrates the code in functions.php.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43379#comment:5>
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