Creating a wp_editor instance with custom tinyMCE buttons

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You pretty much had it, according to the description.

Here’s what you might be looking for for instances 2 and 3 (for instance 1 you can leave the settings empty to get the default set of buttons):

Instance 2:

wp_editor(
    $distribution,
    'distribution',
    array(
      'media_buttons' => false,
      'textarea_rows' => 8,
      'tabindex' => 4,
      'tinymce' => array(
        'theme_advanced_buttons1' => 'bold, italic, ul, pH, temp',
      ),
    )
);

Instance 3 (showing each of the 4 rows you can set for TinyMCE):

wp_editor(
    $distribution,
    'distribution',
    array(
      'media_buttons' => false,
      'textarea_rows' => 8,
      'tabindex' => 4,
      'tinymce' => array(
        'theme_advanced_buttons1' => 'bold, italic, ul, min_size, max_size',
        'theme_advanced_buttons2' => '',
        'theme_advanced_buttons3' => '',
        'theme_advanced_buttons4' => '',
      ),
    )
);

I recommend that you check out the wp-includes/class-wp-editor.php file (specifically the editor_settings function on line 126) in order to understand how WP parses the settings you use inside the wp_editor() function. Also, check this page to understand more about the functionality of TinyMCE and its init options (which I don’t believe WP support fully).

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