Come posso limitare la lunghezza dei caratteri in un estratto?

aggiungi queste righenelfilefunction.php

 function custom_excerpt_length( $length ) {
        return 20;
    }
    add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );
 

add these lines in function.php file

function custom_excerpt_length( $length ) {
        return 20;
    }
    add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );

Oltre alfiltro hook soprafornito dalla risposta di Deepa,ecco unafunzione aggiuntiva chepuò aiutarti aestendere l'uso di the_excerptin duemodi,

Tipermette di ...

Limita l'estrattoin base alnumero di caratterima NONtroncare l'ultimaparola. Ciòti consentirà di restituire unnumeromassimo di caratterima dipreservare leparoleintere,in modo che vengano restituite solo leparole chepossono rientrarenel limite dinumero specificatoe ti consentirà di specificare lafonte da cuiproviene l'estratto.

 function get_excerpt($limit, $source = null){

    $excerpt = $source == "content" ? get_the_content() : get_the_excerpt();
    $excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
    $excerpt = strip_shortcodes($excerpt);
    $excerpt = strip_tags($excerpt);
    $excerpt = substr($excerpt, 0, $limit);
    $excerpt = substr($excerpt, 0, strripos($excerpt, " "));
    $excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
    $excerpt = $excerpt.'... <a href="'.get_permalink($post->ID).'">more</a>';
    return $excerpt;
}

/*
Sample...  Lorem ipsum habitant morbi (26 characters total) 

Returns first three words which is exactly 21 characters including spaces
Example..  echo get_excerpt(21);  
Result...  Lorem ipsum habitant 

Returns same as above, not enough characters in limit to return last word
Example..  echo get_excerpt(24);    
Result...  Lorem ipsum habitant  

Returns all 26 chars of our content, 30 char limit given, only 26 characters needed. 
Example..  echo get_excerpt(30);    
Result...  Lorem ipsum habitant morbi
*/
 

Questafunzionepuòessere utilizzatapiù volte attraversoi file deitemi,ciascuno con limiti di caratteri diversi specificati.

Questafunzione ha la capacità di recuperare unestratto da uno dei due,

• the_content
• the_excerpt

Adesempio,se haipost che contengonotestonella casella_excerptnella schermata dell'editor deipost,ma desideriestrarre unestratto dal corpo_contentinveceper un caso d'uso speciale,lofarestiinvece;

 get_excerpt(140, 'the_content'); //excerpt is grabbed from get_the_content
 

Questo dice allafunzione che vuoii primi 140 caratteri da the_content,indipendentemente dalfatto che unestratto siaimpostatonella casella the_excerpt.

 get_excerpt(140); //excerpt is grabbed from get_the_excerpt
 

Questo dice allafunzione che vuoiprimai primi 140 caratteri da the_excerpte senonesiste alcunestratto,the_content verrà utilizzato come riserva.

Lafunzionepuòesseremigliorataperessere resapiùefficientee/oincorporata con l'uso difiltri di WordPress siaper the_content o the_excerpt o semplicemente usata così com'èin situazioniin cui ci non è un'alternativa adatta all'API di WordPressintegrata .

In addition to the above filter hook supplied by Deepa's answer here is one additional function that can help you extend the use of the_excerpt in two ways,

Allows you to...

Limit the excerpt by number of characters but do NOT truncate the last word. This will allow you to return a maximum number of characters but preserve full words, so only the words that can fit within the specified number limit are returned and allow you to specify the source of where the excerpt will come from.

function get_excerpt($limit, $source = null){

    $excerpt = $source == "content" ? get_the_content() : get_the_excerpt();
    $excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
    $excerpt = strip_shortcodes($excerpt);
    $excerpt = strip_tags($excerpt);
    $excerpt = substr($excerpt, 0, $limit);
    $excerpt = substr($excerpt, 0, strripos($excerpt, " "));
    $excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
    $excerpt = $excerpt.'... <a href="'.get_permalink($post->ID).'">more</a>';
    return $excerpt;
}

/*
Sample...  Lorem ipsum habitant morbi (26 characters total) 

Returns first three words which is exactly 21 characters including spaces
Example..  echo get_excerpt(21);  
Result...  Lorem ipsum habitant 

Returns same as above, not enough characters in limit to return last word
Example..  echo get_excerpt(24);    
Result...  Lorem ipsum habitant  

Returns all 26 chars of our content, 30 char limit given, only 26 characters needed. 
Example..  echo get_excerpt(30);    
Result...  Lorem ipsum habitant morbi
*/

This function can be used multiple times through out theme files, each with different character limits specified.

This function has the ability to retrieve an excerpt from either,

• the_content
• the_excerpt

For example, if you have posts that contain text in the_excerpt box on the post editor screen, but want to pull an excerpt from the_content body instead for a special use case you would instead do;

get_excerpt(140, 'the_content'); //excerpt is grabbed from get_the_content

This tells the function that you want the first 140 characters from the_content, regardless of whether an excerpt is set in the_excerpt box.

get_excerpt(140); //excerpt is grabbed from get_the_excerpt

This tells the function that you want the first 140 characters from the_excerpt first and if no excerpt exists, the_content will be used as a fallback.

The function can be improved to be made more efficient and or incorporated with the use of WordPress filters for both the_content or the_excerpt or simply used as is in situations where there is no suitable, in-built WordPress API alternative.