alphabetize.php

<?php

$last_char = null;

foreach( $documents as $document ) {

    // Gets the first character of the post title
    $this_char = strtoupper( substr( $document->post_title, 0, 1 ) );
    
    // If this character is different than the last, insert the seperator with anchor
    if ( $this_char != $last_char ) {
        $last_char = $this_char;
        echo '<a name="' . $last_char . '"></a>';
        echo '<h3 class="doc-seperator">' . $last_char . '</h3>';
    }
    
    //
    get_template_part( 'document', 'single' );
    
}