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Heyo,

I'm once again sort of stuck with my Customizer API. I've worked quiet a lot on the Theme Customization of my Theme and my functions.php is getting a bit out of hand. Is there a way I can put all these "panels/sections/settings/controls" in an extra file and just load that file into the functions.php?

And even thoe is there a way I can load that file only if the Customizer is open?

Thanks in advance!

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Yes. You can load the code in the customize_register action. One example:

<?php
// File: functions.php
add_action( 'customize_register', function( $wp_customize ) {
    require_once dirname( __FILE__ ) . '/inc/customize.php';
    wpse256532_customize_register( $wp_customize );
} );

And the inc/customize.php file:

<?php
// File: customize.php
function wpse256532_customize_register( $wp_customize ) {
    $wp_customize->add_setting( /* ... */ );
    $wp_customize->add_control( /* ... */ );
    // ...
}
// ... any additional customizer classes and other includes ...
  • This somehow doesn't work for me ... The website loads but if I go into the customizer, it looks like an php error. If I change the 'customize_register' into 'some_customize_register' the customizer loads but doesn't have the custom panels/sections. – Pelle2010 Feb 17 '17 at 7:59
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    You're right. I neglected to pass along the $wp_customize argument from the customize_register action. I just updated the example to include this. – Weston Ruter Feb 18 '17 at 0:31
  • This once again didn't work for me. Am I doing something wrong? I change the 'wpse256532_customize_register' to 'mytheme_customize_register' in both files and change the '/inc/customize.php' into '/inc/mytheme-customize.php'. Its the same thing ... I get a white site (php error) and if I change the 'customize_register' into 'mytheme_customize_register' it loads the customizer but not my custom Pannels/Settings. – Pelle2010 Feb 20 '17 at 7:48
  • Changing customize_register to mytheme_customize_register will just prevent the logic from being called at all, since mytheme_customize_register is not a valid action. There's a chance that you're on an older version of PHP that doesn't recognize __DIR__ so I changed the example to use dirname( __FILE__ ) instead. – Weston Ruter Feb 20 '17 at 19:11
  • I've now used this method on a new theme and it works like a charm ... no idea what was wrong with the earlier theme I created back than ... thank you! – Pelle2010 Jun 16 '17 at 10:30

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