Como posso limitar o comprimento do personagem no trecho?

Adicioneessas linhasno arquivofunction.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 );

Além dogancho defiltro acimafornecidopela resposta de Deepa aqui é umafunção adicional quepode ajudá-lo aestender o uso de the_excerpt de duasmaneiras,

permite que você ...

Limite otrechopornúmero de caracteres,masnãotruncar a últimapalavra. Issopermitirá que você retorne umnúmeromáximo de caracteres,maspreservepalavras completas,portanto,apenas aspalavras quepodem caber dentro do limitenuméricoespecificado são retornadase permitem que vocêespecifique afonte de onde otrecho vire.

 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
*/
 

Estafunçãopode ser usada várias vezes através de arquivostemáticos,cada um com diferentes limites de caracteresespecificados.

Estafunçãotem a capacidade de recuperar umtrecho de qualquer um,

• the_content
• the_excerpt

Porexemplo,se vocêtiverposts que contêmtextona caixa_excerptnatela Post Editor,mas desejapuxar umtrecho do corpo_contentem vez de um caso de usoespecial,vocêfaria;

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

Issoinforma afunção que você deseja que osprimeiros 140 caracteres de the_content,independentemente de umexcertofor definidoem the_excerpt caixa.

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

Issoinforma afunção que você deseja que osprimeiros 140 caracteres de the_excerptprimeiroe senenhumtrechoexistir,the_content será usado como umfallback.

afunçãopode sermelhoradapara serfeitamaiseficientee ouincorporada com o uso defiltros WordPresspara ambos the_content ou the_excerpt ou simplesmente usado comoestáem situaçõesem que é não é adequado ,alternativa de API do WordPress In-Conformado.

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.