I have the following problem: I want to add print_f in an array in wordpress.

printf( __('Option to share on %s', 'themename'), 'name')

However, the following code does not work properly for me. Instead of the actual result, it throws out "30" .

                        new WP_Customize_Control(
                                        'label' => printf( __('Option to share on %s', 'theme-name'), 'name'),
                                        'section' => 'share',
                                        'settings' => 'display-name',
                                        'type' => 'checkbox',
                                        'description' => 'Just a Description.'
                                        'active_callback' => 'share_callback',

Hope someone can help me...

1 Answer 1


As documented (always read the docs), printf() returns:

...the length of the outputted string.

That's why you're getting 30.

If you're adding a value to an array or a string you need to use a function that returns a value. Not one that prints. printf() prints the value and returns the length of the printed value. To return a formatted string, you need to use sprintf():

'label' => sprintf( __('Option to share on %s', 'theme-name'), 'name'),

See here for more on the difference between returning and printing/echoing.

  • Thank you, the option works great!
    – Chris
    Commented May 11, 2021 at 8:02

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