Come mostrare un elenco di termini gerarchici?

Utilizza wp_list_categories con 'taxonomy' => 'taxonomy',èprogettatoper creareelenchi di categoriegerarchichema supporterà anche l'utilizzo di unatassonomiapersonalizzata ..

Esempio di codice:
Visualizzai terminiin unatassonomiapersonalizzata

Se l'elencotorna a sembrarepiatto,èpossibile cheti serva solo unpo 'di CSSper aggiungereil riempimento aglielenchi,in modo dapoter vedere la loro strutturagerarchica.

Use wp_list_categories with the 'taxonomy' => 'taxonomy' argument, it's built for creating hierarchical category lists but will also support using a custom taxonomy..

Codex Example:
Display terms in a custom taxonomy

If the list comes back looking flat, it's possible you just need a little CSS to add padding to the lists, so you can see their hierarchical structure.

Mi rendo conto che questa è una domandamolto vecchia,ma se haibisogno di costruire una struttura effettiva ditermini,questopotrebbeessere unmetodo utileperte:

 /**
 * Ordinain modogerarchico un array ditermini ditassonomia. Le categoriefiglio saranno
 *posto sotto unmembro "figli" delterminegenitore.
 * @param Array $ catsterminetassonomia oggetti da ordinare
 * @param Array $nell'array dei risultatiperinserirli
 * @paraminteger $parentId l'IDgenitore correntein cuiinserirli
 */
funzione sort_terms_hierarchically (Array & amp; $ cats,Array & amp; $into,$parentId=0)
{
 foreach ($ cats as $i=> $ cat) {
 if ($ cat- >parent==$parentId) {
            $in [$ cat- >term_id]=$ cat;
 nonimpostato ($ cats [$i]);
        }
    }

 foreach ($into as $topCat) {
        $topCat- > children=array ();
        sort_terms_hierarchically ($ cats,$topCat- > children,$topCat- >term_id);
    }
}
 

L'utilizzo èil seguente:

  $ categories=get_terms ('my_taxonomy_name',array ('hide_empty'=>false));
$ categoryHierarchy=array ();
sort_terms_hierarchically ($ categories,$ categoryHierarchy);

var_dump ($ categoryHierarchy);
 

I realize, this is a very old question, but if you have a need to build up an actual structure of terms, this might be a useful method for you:

/**
 * Recursively sort an array of taxonomy terms hierarchically. Child categories will be
 * placed under a 'children' member of their parent term.
 * @param Array   $cats     taxonomy term objects to sort
 * @param Array   $into     result array to put them in
 * @param integer $parentId the current parent ID to put them in
 */
function sort_terms_hierarchically(Array &$cats, Array &$into, $parentId = 0)
{
    foreach ($cats as $i => $cat) {
        if ($cat->parent == $parentId) {
            $into[$cat->term_id] = $cat;
            unset($cats[$i]);
        }
    }

    foreach ($into as $topCat) {
        $topCat->children = array();
        sort_terms_hierarchically($cats, $topCat->children, $topCat->term_id);
    }
}

Usage is as follows:

$categories = get_terms('my_taxonomy_name', array('hide_empty' => false));
$categoryHierarchy = array();
sort_terms_hierarchically($categories, $categoryHierarchy);

var_dump($categoryHierarchy);

Non conosco alcunafunzione chefaccia quello che vuoimapuoi creare qualcosa delgenere:

 <ul>
    <?php $hiterms = get_terms("my_tax", array("orderby" => "slug", "parent" => 0)); ?>
    <?php foreach($hiterms as $key => $hiterm) : ?>
        <li>
            <?php echo $hiterm->name; ?>
            <?php $loterms = get_terms("my_tax", array("orderby" => "slug", "parent" => $hiterm->term_id)); ?>
            <?php if($loterms) : ?>
                <ul>
                    <?php foreach($loterms as $key => $loterm) : ?>
                        <li><?php echo $loterm->name; ?></li>
                    <?php endforeach; ?>
                </ul>
            <?php endif; ?>
        </li>
    <?php endforeach; ?>
</ul>
 

Non l'hotestatomapuoi vedere a cosa sto arrivando. Ciò cheil codiceprecedentefarà è darti solo due livelli

EDIT: ahh sì,puoi usare wp_list_categories ()perfare quello che vuoi.

I dont know of any function that does what you want but you can build up something like this:

<ul>
    <?php $hiterms = get_terms("my_tax", array("orderby" => "slug", "parent" => 0)); ?>
    <?php foreach($hiterms as $key => $hiterm) : ?>
        <li>
            <?php echo $hiterm->name; ?>
            <?php $loterms = get_terms("my_tax", array("orderby" => "slug", "parent" => $hiterm->term_id)); ?>
            <?php if($loterms) : ?>
                <ul>
                    <?php foreach($loterms as $key => $loterm) : ?>
                        <li><?php echo $loterm->name; ?></li>
                    <?php endforeach; ?>
                </ul>
            <?php endif; ?>
        </li>
    <?php endforeach; ?>
</ul>

I haven't tested this but you can see what I'm getting at. What the above code will do is give you only two levels

EDIT: ahh yes you can use wp_list_categories() to do what you after.

Puoi usare wp_list_categories (),con un argomento "tassonomia".

You can use wp_list_categories(), with a 'taxonomy' argument.

Il codice seguentegenererà unmenu a discesa coni termini,mapuò anchegenerare qualsiasi altroelemento/strutturamodificando la variabile $ outputTemplatee modificando le righe str_replace:

 function get_terms_hierarchical($terms, $output = '', $parent_id = 0, $level = 0) {
    //Out Template
    $outputTemplate = '<option value="%ID%">%PADDING%%NAME%</option>';

    foreach ($terms as $term) {
        if ($parent_id == $term->parent) {
            //Replacing the template variables
            $itemOutput = str_replace('%ID%', $term->term_id, $outputTemplate);
            $itemOutput = str_replace('%PADDING%', str_pad('', $level*12, '&nbsp;&nbsp;'), $itemOutput);
            $itemOutput = str_replace('%NAME%', $term->name, $itemOutput);

            $output .= $itemOutput;
            $output = get_terms_hierarchical($terms, $output, $term->term_id, $level + 1);
        }
    }
    return $output;
}

$terms = get_terms('taxonomy', array('hide_empty' => false));
$output = get_terms_hierarchical($terms);

echo '<select>' . $output . '</select>';  
 

The following code will generate drop-down with terms, but also can generate any other element/structure by editing the $outputTemplate variable, and editing str_replace lines:

function get_terms_hierarchical($terms, $output = '', $parent_id = 0, $level = 0) {
    //Out Template
    $outputTemplate = '<option value="%ID%">%PADDING%%NAME%</option>';

    foreach ($terms as $term) {
        if ($parent_id == $term->parent) {
            //Replacing the template variables
            $itemOutput = str_replace('%ID%', $term->term_id, $outputTemplate);
            $itemOutput = str_replace('%PADDING%', str_pad('', $level*12, '&nbsp;&nbsp;'), $itemOutput);
            $itemOutput = str_replace('%NAME%', $term->name, $itemOutput);

            $output .= $itemOutput;
            $output = get_terms_hierarchical($terms, $output, $term->term_id, $level + 1);
        }
    }
    return $output;
}

$terms = get_terms('taxonomy', array('hide_empty' => false));
$output = get_terms_hierarchical($terms);

echo '<select>' . $output . '</select>';  

Dato che stavo cercando la stessa cosamaper ottenerei termini di unpost,allafine ho compilato questoe perme funziona.

Che cosafa:
• Ottienetuttii termini di unnome ditassonomiaper unpost specifico.
•per unatassonomiagerarchica con due livelli (es: livello1: 'paese'e livello2: 'città'),crea un h4 conil livello1 seguito da unelenco ul di livello2e questopertuttiglielementi di livello1.
• se latassonomianon ègerarchica,creerà solo unelenco ul dituttiglielementi. eccoil codice (lo scrivoperme quindi ho cercato diessereilpiùgenericopossibilema ...):

 function finishingLister($heTerm){
    $myterm = $heTerm;
    $terms = get_the_terms($post->ID,$myterm);
    if($terms){
        $count = count($terms);
        echo '<h3>'.$myterm;
        echo ((($count>1)&&(!endswith($myterm, 's')))?'s':"").'</h3>';
        echo '<div class="'.$myterm.'Wrapper">';
        foreach ($terms as $term) {
            if (0 == $term->parent) $parentsItems[] = $term;
            if ($term->parent) $childItems[] = $term; 
        };
        if(is_taxonomy_hierarchical( $heTerm )){
            foreach ($parentsItems as $parentsItem){
                echo '<h4>'.$parentsItem->name.'</h4>';
                echo '<ul>';
                foreach($childItems as $childItem){
                    if ($childItem->parent == $parentsItem->term_id){
                        echo '<li>'.$childItem->name.'</li>';
                    };
                };
                echo '</ul>';
            };
        }else{
            echo '<ul>';
            foreach($parentsItems as $parentsItem){
                echo '<li>'.$parentsItem->name.'</li>';
            };
            echo '</ul>';
        };
        echo '</div>';
    };
};
 

Quindi allafine chiami lafunzione con questo (ovviamente,sostituiscimy_taxonomy coniltuo): finishingLister('my_taxonomy');

Nonfingo che siaperfettoma come ho dettofunzionaperme.

As I was looking for the same but to get terms of one post, finally I compiled this, and it works for me.

What it does :
• it gets all terms of a taxonomy name for a specific post.
• for a hierachical taxonomy with two levels (ex: level1:'country' and level2:'cities'), it creates a h4 with the level1 followed by an ul list of level2 and this for all level1 items.
• if the taxonomy is not hierarchical, it will create only an ul list of all items. here is the code (I write it for me so I tried to be as generic as I can but...) :

function finishingLister($heTerm){
    $myterm = $heTerm;
    $terms = get_the_terms($post->ID,$myterm);
    if($terms){
        $count = count($terms);
        echo '<h3>'.$myterm;
        echo ((($count>1)&&(!endswith($myterm, 's')))?'s':"").'</h3>';
        echo '<div class="'.$myterm.'Wrapper">';
        foreach ($terms as $term) {
            if (0 == $term->parent) $parentsItems[] = $term;
            if ($term->parent) $childItems[] = $term; 
        };
        if(is_taxonomy_hierarchical( $heTerm )){
            foreach ($parentsItems as $parentsItem){
                echo '<h4>'.$parentsItem->name.'</h4>';
                echo '<ul>';
                foreach($childItems as $childItem){
                    if ($childItem->parent == $parentsItem->term_id){
                        echo '<li>'.$childItem->name.'</li>';
                    };
                };
                echo '</ul>';
            };
        }else{
            echo '<ul>';
            foreach($parentsItems as $parentsItem){
                echo '<li>'.$parentsItem->name.'</li>';
            };
            echo '</ul>';
        };
        echo '</div>';
    };
};

So finally you call the function with this (obviously, you replace my_taxonomy by yours) : finishingLister('my_taxonomy');

I don't pretend it's perfect but as I said it works for me.

Ho avuto questoproblemae nessuna delle risposte qui hafunzionatoperme,per unmotivo oper l'altro.

Ecco lamia versione aggiornatae funzionante.

 function locationSelector( $fieldName ) {
    $args = array('hide_empty' => false, 'hierarchical' => true, 'parent' => 0); 
    $terms = get_terms("locations", $args);

    $html = '';
    $html .= '<select name="' . $fieldName . '"' . 'class="chosen-select ' . $fieldName . '"' . '>';
        foreach ( $terms as $term ) {
            $html .= '<option value="' . $term->term_id . '">' . $term->name . '</option>';

            $args = array(
                'hide_empty'    => false, 
                'hierarchical'  => true, 
                'parent'        => $term->term_id
            ); 
            $childterms = get_terms("locations", $args);

            foreach ( $childterms as $childterm ) {
                $html .= '<option value="' . $childterm->term_id . '">' . $term->name . ' > ' . $childterm->name . '</option>';

                $args = array('hide_empty' => false, 'hierarchical'  => true, 'parent' => $childterm->term_id); 
                $granchildterms = get_terms("locations", $args);

                foreach ( $granchildterms as $granchild ) {
                    $html .= '<option value="' . $granchild->term_id . '">' . $term->name . ' > ' . $childterm->name . ' > ' . $granchild->name . '</option>';
                }
            }
        }
    $html .=  "</select>";

    return $html;
}
 

E utilizzo:

 $selector = locationSelector('locationSelectClass');
echo $selector;
 

I had this problem and none of the answers here worked for me, for one reason or another.

Here is my updated and working version.

function locationSelector( $fieldName ) {
    $args = array('hide_empty' => false, 'hierarchical' => true, 'parent' => 0); 
    $terms = get_terms("locations", $args);

    $html = '';
    $html .= '<select name="' . $fieldName . '"' . 'class="chosen-select ' . $fieldName . '"' . '>';
        foreach ( $terms as $term ) {
            $html .= '<option value="' . $term->term_id . '">' . $term->name . '</option>';

            $args = array(
                'hide_empty'    => false, 
                'hierarchical'  => true, 
                'parent'        => $term->term_id
            ); 
            $childterms = get_terms("locations", $args);

            foreach ( $childterms as $childterm ) {
                $html .= '<option value="' . $childterm->term_id . '">' . $term->name . ' > ' . $childterm->name . '</option>';

                $args = array('hide_empty' => false, 'hierarchical'  => true, 'parent' => $childterm->term_id); 
                $granchildterms = get_terms("locations", $args);

                foreach ( $granchildterms as $granchild ) {
                    $html .= '<option value="' . $granchild->term_id . '">' . $term->name . ' > ' . $childterm->name . ' > ' . $granchild->name . '</option>';
                }
            }
        }
    $html .=  "</select>";

    return $html;
}

And usage:

$selector = locationSelector('locationSelectClass');
echo $selector;

Ho usatoil codice @popsi chefunzionavamoltobene e l'ho resopiùefficientee facile da leggere:

 /**
 * Ordinain modogerarchico un array ditermini ditassonomia.Le categoriefiglio saranno
 *posto sotto unmembro "figli" delterminegenitore.
 * @param Array $ catsterminetassonomia oggetti da ordinare
 * @paraminteger $parentId l'IDgenitore correntein cuiinserirli
 */
funzione sort_terms_hierarchicaly (Array $ cats,$parentId=0)
{
    $in=[];
 foreach ($ cats as $i=> $ cat) {
 if ($ cat- >parent==$parentId) {
            $ cat- > children=sort_terms_hierarchicaly ($ cats,$ cat- >term_id);
            $in [$ cat- >term_id]=$ cat;
        }
    }
    restituire $in;
}
 

Utilizzo:

  $ Sort_terms=sort_terms_hierarchicaly ($terms);
 

I used @popsi code that was working really well and I made it a more efficient and easy to read:

/**
 * Recursively sort an array of taxonomy terms hierarchically. Child categories will be
 * placed under a 'children' member of their parent term.
 * @param Array   $cats     taxonomy term objects to sort
 * @param integer $parentId the current parent ID to put them in
 */
function sort_terms_hierarchicaly(Array $cats, $parentId = 0)
{
    $into = [];
    foreach ($cats as $i => $cat) {
        if ($cat->parent == $parentId) {
            $cat->children = sort_terms_hierarchicaly($cats, $cat->term_id);
            $into[$cat->term_id] = $cat;
        }
    }
    return $into;
}

Usage :

$sorted_terms = sort_terms_hierarchicaly($terms);

Questa soluzione èmenoefficiente del codice di @popsi,poichéesegue unanuova queryper ognitermine,ma è anchepiùfacile da usarein unmodello. Seiltuo sito web utilizza la cache,potresti,comeme,nonpreoccuparti del leggero sovraccarico del database.

Non ènecessariopreparare un array che sarà riempito ricorsivamente ditermini. Devi solo chiamarlonello stessomodoin cui chiameresti get_terms () (ilnon-modulo deprecato con solo un arrayper un argomento). Restituisce un array di oggetti WP_Term con unaproprietàextra chiamata children.

 function get_terms_tree( Array $args ) {
    $new_args = $args;
    $new_args['parent'] = $new_args['parent'] ?? 0;
    $new_args['fields'] = 'all';

    // The terms for this level
    $terms = get_terms( $new_args );

    // The children of each term on this level
    foreach( $terms as &$this_term ) {
        $new_args['parent'] = $this_term->term_id;
        $this_term->children = get_terms_tree( $new_args );
    }

    return $terms;
}
 

L'utilizzo è semplice:

 $terms = get_terms_tree([ 'taxonomy' => 'my-tax' ]);
 

This solution is less efficient than @popsi's code, since it makes a new query for every term, but it's also easier to use in a template. If your website uses caching, you may, like me, not mind the slight database overhead.

You don't need to prepare an array that'll be recursively filled with terms. You just call it the same way you would call get_terms() (the non-deprecated form with only an array for an argument). It returns an array of WP_Term objects with an extra property called children.

function get_terms_tree( Array $args ) {
    $new_args = $args;
    $new_args['parent'] = $new_args['parent'] ?? 0;
    $new_args['fields'] = 'all';

    // The terms for this level
    $terms = get_terms( $new_args );

    // The children of each term on this level
    foreach( $terms as &$this_term ) {
        $new_args['parent'] = $this_term->term_id;
        $this_term->children = get_terms_tree( $new_args );
    }

    return $terms;
}

Usage is simple:

$terms = get_terms_tree([ 'taxonomy' => 'my-tax' ]);

Assicurati che hierarchical=true siapassato altuo get_terms() chiamata.

Nota che hierarchical=true è l'impostazionepredefinita,quindiin realtà,assicurati solo chenon sia stato sovrascrittoperessere false.

Be sure that hierarchical=true is passed to your get_terms() call.

Note that hierarchical=true is the default, so really, just be sure that it hasn't been overridden to be false.

Qui ho unelenco di selezione a discesa a quattro livelli conilprimoelementonascosto

 <select name="lokalizacja" id="ucz">
            <option value="">Wszystkie lokalizacje</option>
            <?php
            $excluded_term = get_term_by('slug', 'podroze', 'my_travels_places');
            $args = array(
                'orderby' => 'slug',
                'hierarchical' => 'true',
                'exclude' => $excluded_term->term_id,
                'hide_empty' => '0',
                'parent' => $excluded_term->term_id,
            );              
            $hiterms = get_terms("my_travels_places", $args);
            foreach ($hiterms AS $hiterm) :
                echo "<option value='".$hiterm->slug."'".($_POST['my_travels_places'] == $hiterm->slug ? ' selected="selected"' : '').">".$hiterm->name."</option>\n";

                $loterms = get_terms("my_travels_places", array("orderby" => "slug", "parent" => $hiterm->term_id,'hide_empty' => '0',));
                if($loterms) :
                    foreach($loterms as $key => $loterm) :

                    echo "<option value='".$loterm->slug."'".($_POST['my_travels_places'] == $loterm->slug ? ' selected="selected"' : '').">&nbsp;-&nbsp;".$loterm->name."</option>\n";

                    $lo2terms = get_terms("my_travels_places", array("orderby" => "slug", "parent" => $loterm->term_id,'hide_empty' => '0',));
                    if($lo2terms) :
                        foreach($lo2terms as $key => $lo2term) :

                        echo "<option value='".$lo2term->slug."'".($_POST['my_travels_places'] == $lo2term->slug ? ' selected="selected"' : '').">&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;".$lo2term->name."</option>\n";



                        endforeach;
                    endif;

                    endforeach;
                endif;

            endforeach;
            ?>
         </select>
        <label>Wybierz rodzaj miejsca</label>
        <select name="rodzaj_miejsca" id="woj">
            <option value="">Wszystkie rodzaje</option>
            <?php
            $theterms = get_terms('my_travels_places_type', 'orderby=name');
            foreach ($theterms AS $term) :
                echo "<option value='".$term->slug."'".($_POST['my_travels_places_type'] == $term->slug ? ' selected="selected"' : '').">".$term->name."</option>\n";                   
            endforeach;
            ?>
         </select>
 

Here I have four level dropdown select list with hidden first item

<select name="lokalizacja" id="ucz">
            <option value="">Wszystkie lokalizacje</option>
            <?php
            $excluded_term = get_term_by('slug', 'podroze', 'my_travels_places');
            $args = array(
                'orderby' => 'slug',
                'hierarchical' => 'true',
                'exclude' => $excluded_term->term_id,
                'hide_empty' => '0',
                'parent' => $excluded_term->term_id,
            );              
            $hiterms = get_terms("my_travels_places", $args);
            foreach ($hiterms AS $hiterm) :
                echo "<option value='".$hiterm->slug."'".($_POST['my_travels_places'] == $hiterm->slug ? ' selected="selected"' : '').">".$hiterm->name."</option>\n";

                $loterms = get_terms("my_travels_places", array("orderby" => "slug", "parent" => $hiterm->term_id,'hide_empty' => '0',));
                if($loterms) :
                    foreach($loterms as $key => $loterm) :

                    echo "<option value='".$loterm->slug."'".($_POST['my_travels_places'] == $loterm->slug ? ' selected="selected"' : '').">&nbsp;-&nbsp;".$loterm->name."</option>\n";

                    $lo2terms = get_terms("my_travels_places", array("orderby" => "slug", "parent" => $loterm->term_id,'hide_empty' => '0',));
                    if($lo2terms) :
                        foreach($lo2terms as $key => $lo2term) :

                        echo "<option value='".$lo2term->slug."'".($_POST['my_travels_places'] == $lo2term->slug ? ' selected="selected"' : '').">&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;".$lo2term->name."</option>\n";



                        endforeach;
                    endif;

                    endforeach;
                endif;

            endforeach;
            ?>
         </select>
        <label>Wybierz rodzaj miejsca</label>
        <select name="rodzaj_miejsca" id="woj">
            <option value="">Wszystkie rodzaje</option>
            <?php
            $theterms = get_terms('my_travels_places_type', 'orderby=name');
            foreach ($theterms AS $term) :
                echo "<option value='".$term->slug."'".($_POST['my_travels_places_type'] == $term->slug ? ' selected="selected"' : '').">".$term->name."</option>\n";                   
            endforeach;
            ?>
         </select>