Thord Daniel Hedengren - Smashing WordPress_ Beyond the Blog-Wiley (2014)

192 PART III • Using Plugins with WordPress

Then you add the function smashings_settingsdemo_init() to the

admin_init hook.

Next, add a little something to the section just to prove that you can:

// Runs at the start of the section

function smashing_settings_section_callback() {

echo '<p>This is the section intro.</p>';

}

You’ll recognize the function name, smashing_settings_section_callback(), from

the earlier add_settings_section(). It is the callback function, so this will run at the

beginning of the section, echoing a p tag with some text.

In a similar fashion, create the callback function for the add_settings_field() you

created, called smashing_sample_input_callback():

// The input sample setting

function smashing_sample_input_callback() {

// Leaving PHP for a while ?>

<input type="text" name="smashing_sample_input" value="<?php echo

get_option( 'smashing_sample_input' ); ?>" />

<?php }

// Back to PHP

This function contains only an input field with the value of smashing_sample_input

passed through get_option(), which is what you’ll be saving. This is obviously the ID of

the settings field you created.

Finally, you need to sanitize the form input a bit. For this example, esc_attr() will be

enough, but you might want other types of sanitation:

// Sanitize

function smashing_settingsdemo_validate($input) {

// Encode

$newinput = esc_attr($input);

return $newinput;

}

So what just happened here? You created a settings page, which in turn contains settings_

fields() for all your settings fields (just one in the example — you can have more than

that) and do_settings_section() for your sections. The following is the complete

settings plugin, from start to finish:

<?php

/*

Plugin Name: Smashing Settings

Plugin URI: http://tdh.me/wordpress/smashing-settings/