首先将此函数添加到函数中。php文件

function max_title_length($title){
     $max = 20;
    return substr( $title, 0, $max ). " …";
}

add_filter( \'the_title\', \'max_title_length\');

remove_filter( \'the_title\', \'max_title_length\');

您可以使用此位限制显示的字符数并附加省略号。

在这个特定的示例中，我将其设置为trunicate，长度为38个字符，并且仅当标题为trunicate时才显示省略号。无论长度如何，在single\\u post页面上显示完整标题。

<?php
//assign the title to a variable
$the_title = esc_attr ( the_title_attribute ( \'echo=0\' ) );
//specify our desired max character count    
$max_length = 38;
//strlen gets the length of the string
$title_length = strlen ( $the_title ); 

// check if the length of the string is greater than our assigned max length
if ( $title_length > $max_length ) {
    // if it is display a substring of the title from the 
    // first character to the 38th character and append ...
    $title_excerpt = substr ( $the_title, 0, $max_length ) . \'...\';
} else {
    // otherwise just return the_title()
    $title_excerpt = $the_title;
} ?>

<h1 class="entry-title">
    <?php if ( is_single () ) { // If article page
        the_title ();
    } else {  // If homepage
    ?>

    <a href="<?php the_permalink (); ?>" title="<?php echo esc_attr ( the_title_attribute ( \'echo=0\' ) ); ?>" rel="bookmark"><?php echo $title_excerpt; ?></a>
    <?php } ?>
</h1>

我改进了@Bainternet答案，使其只显示... 当标题长度超过$max:

function max_title_length( $title ) { 
        $max = 30;
    if( strlen( $title ) > $max ) {
        return substr( $title, 0, $max ). " …";
    } else {
        return $title;
    }
}

add_filter( \'the_title\', \'max_title_length\');