PHP结合Wordpress的两个功能自定义摘录长度

Question

我目前正在创建一个WordPress主题，我有一个显示标题和摘录的区域，但是摘要需要根据标题长度（即标题和摘录都占据一个固定的空间）。因此，我需要根据帖子标题的长度动态更改摘录长度。

我见过两段可能有用的代码片段。第一个给出如下：

<?php 
    // Variable & intelligent excerpt length. 
    function print_excerpt($length) { // Max excerpt length. Length is set in characters 
     global $post; 
     $text = $post->post_excerpt; 
     if ('' == $text) { 
      $text = get_the_content(''); 
      $text = apply_filters('the_content', $text); 
      $text = str_replace(']]>', ']]>', $text); 
     } 
     $text = strip_shortcodes($text); // optional, recommended 
     $text = strip_tags($text); // use ' $text = strip_tags($text,'<p><a>'); ' if you want to keep some tags 

     $text = substr($text,0,$length); 
     $excerpt = reverse_strrchr($text, '.', 1); 
     if($excerpt) { 
      echo apply_filters('the_excerpt',$excerpt); 
     } else { 
      echo apply_filters('the_excerpt',$text); 
     } 
    } 

    // Returns the portion of haystack which goes until the last occurrence of needle 
    function reverse_strrchr($haystack, $needle, $trail) { 
     return strrpos($haystack, $needle) ? substr($haystack, 0, strrpos($haystack, $needle) + $trail) : false; 
    } 

这样就可以简单地使用，例如， <?php print_excerpt(50); ?>。下面的代码根据标题长度改变了摘录长度。我将如何去结合这两段代码？

 <?php 
     // Dynamically resize excerpt according to title length 
     $rem_len = ""; //clear variable 
     $title_len = strlen($post->post_title); //get length of title 
     if($title_len <= 35){ 
      $rem_len=188; //calc space remaining for excerpt 
     }elseif($title_len <= 70){ 
      $rem_len=146; 
     }elseif($title_len <= 105){ 
      $rem_len=104; 
     }elseif($title_len <= 140){ 
      $rem_len=62; 
     } 
     $trunc_ex = substr($post->post_excerpt, 0, $rem_len); //truncate excerpt to fit remaining space 
     if(strlen($trunc_ex) < strlen($post->post_excerpt)) $trunc_ex = $trunc_ex . " [...]"; 
     echo "<p>" . $trunc_ex . "</p>"; //display excerpt 
     ?> 

Answer 1

解决：

<?php 
// Variable & intelligent excerpt length. 
function print_excerpt($title) { // Max excerpt length. Length is set in characters 
global $post; 

$rem_len = ""; //clear variable 
$title_len = strlen($title); //get length of title 
$excerpt_line=40; 
if($title_len <= 17){ 
    $rem_len=$excerpt_line*8; //calc space remaining for excerpt 
}elseif($title_len <= 34){ 
    $rem_len=$excerpt_line*7; 
}elseif($title_len <= 51){ 
    $rem_len=$excerpt_line*6; 
}elseif($title_len <= 68){ 
    $rem_len=$excerpt_line*5; 
}elseif($title_len <= 85){ 
    $rem_len=$excerpt_line*4; 
} 

$text = $post->post_excerpt; 
if ('' == $text) { 
    $text = get_the_content(''); 
    $text = apply_filters('the_content', $text); 
    $text = str_replace(']]>', ']]>', $text); 
} 
$text = strip_shortcodes($text); // optional, recommended 
$text = strip_tags($text,'<p>'); // use ' $text = strip_tags($text,'<p><a>'); ' if you want to keep some tags 

$text = substr($text,0,$rem_len); 
$excerpt = reverse_strrchr($text, ' ', 1); 
if($excerpt) { 
    echo apply_filters('the_excerpt',$excerpt); 
} else { 
    echo apply_filters('the_excerpt',$text); 
} 

} 

    // Returns the portion of haystack which goes until the last occurrence of needle 
function reverse_strrchr($haystack, $needle, $trail) { 
    return strrpos($haystack, $needle) ? substr($haystack, 0, strrpos($haystack,  $needle) + $trail) : false; 
} 
?>