Change site template from php

Question

What is the argument to pass to switch theme, when I have the result of wp_get_themes()?

 $args = array(
        'allowed' => true
 );

 $themes = wp_get_themes(  );

 foreach ($themes as $theme) {

          $argument_to_pass_to_switch_theme = ??????

 }

Answer 1

If I understand your question, you should use this inside your foreach:

$argument_to_pass_to_switch_theme = $theme->get_stylesheet();

---

Just taking a look at the documentation:

The function wp_get_themes()...

"...returns an array of WP_Theme objects based on the argument."

This class WP_Theme has a method get_stylesheet(), which...

"...returns a string with the directory name of the theme's "stylesheet" files, inside the theme root. If this is a child theme it is the directory from the child theme. "

And the function switch_theme()...

"...accepts one argument: $stylesheet of the theme. ($stylesheet is the name of your folder slug."

Answer 2

wp_get_themes() returns a WP_Theme object, one of the methods of which, get_stylesheet() will return the value you need to pass to switch_theme()

You are not likely to get "the variable" to echo later. If you have more than one theme and is nearly always the case (as you should keep a bundled theme just in case) you are going to have multiple variables, so you need to create an array and not a string.

$themes = wp_get_themes();
foreach ($themes as $theme) {
  $argument_to_pass_to_switch_theme[] =  $theme->get_stylesheet();
}

var_dump($argument_to_pass_to_switch_theme);

If you run the code as you have it mocked up...

$themes = wp_get_themes();
foreach ($themes as $theme) {
  $argument_to_pass_to_switch_theme =  $theme->get_stylesheet();
}

var_dump($argument_to_pass_to_switch_theme);

... you will overwrite the $argument_to_pass_to_switch_theme variable at every iteration of the loop and only end up with the stylesheet name for the last theme in the loop.