php - PHP 根据搜索输入减少大型文本集

Question

我不完全确定我应该如何措辞，但是.. 我怎样才能将一大段文本缩减为与搜索相关的信息。

例如说我有一个段落，我的搜索是efficitur eget

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec placerat libero id mi facilisis, at sagittis tortor porta. Donec eget sodales ipsum. Donec sagittis lacus mauris, et efficitur quam porttitor eu. Fusce eget consequat purus. Maecenas rutrum arcu viverra est rhoncus, et hendrerit tellus elementum. Aenean ornare dolor tempus ante porta, sit amet convallis lacus rutrum. Maecenas bibendum magna tortor. Vestibulum tortor nunc, dictum vitae nisl quis, pharetra mattis massa. Vestibulum vulputate leo eros, eget maximus ipsum tristique quis. Quisque rutrum vel felis eget feugiat. Etiam interdum nisi ac nibh egestas malesuada. Mauris fringilla nisi id rutrum fermentum. Ut ultrices ipsum rutrum, hendrerit urna non, dapibus ligula. Vivamus rhoncus eros eget eros feugiat volutpat. In ac arcu at purus porta varius. Sed commodo diam a ipsum vestibulum, et sagittis sem consectetur.

是否可以轻松地将文本缩减为包含efficiturand的单个句子eget，而不显示整个段落

... Donec sagittis lacus mauris, et efficitur quam porttitor eu. Fusce eget consequat purus. Maecenas rutrum ...

目前我的puesdo想法是

// Find strpos of search words
// Make positions unique
// Find words closest together within X characters
// Allow for words on LEFT and RIGHT of keyword
// .. Continue until every keyword has lapsed
// Add "dots" to LEFT or/and RIGHT of the result
// implode
// return

但是，如果这已经完成，或者 PHP 是否具有执行此操作的功能，我宁愿不重新发明轮子。

标签： phpsearchtext

Answer 1

我已经编写了自己的函数，它将大段落转换为小句子

function reduce_max_word_contents($content, $keywords, $exact, $max_words, $dots)
{
    
    if (is_array($keywords) == false) {
        $keywords = (array) $keywords;
        $keywords = array_filter($keywords);
    }
    
    $format_content = $content;
    $format_content = trim($format_content);
    
    if (empty($format_content)) {
        // trigger_error("No Content Given");
        return "";
    }
    
    if (empty($keywords)) {
        // trigger_error("No Keywords Given");
        return $format_content;
    }
    
    if (!$max_words) {
        // trigger_error("No Max Words Set");
        return $format_content;
    }
    
    $format_content_word_s = $format_content;
    $format_content_word_s = explode(' ', $format_content_word_s);
    $format_content_word_s = (array) $format_content_word_s;
    
    if (empty($format_content_word_s)) {
        // trigger_error("No Words Given");
        return $format_content;
    }
    
    $words_exceed_max = true;
    $words_exceed_max = ($words_exceed_max && !empty($format_content_word_s));
    $words_exceed_max = ($words_exceed_max && (count($format_content_word_s) > $max_words));
    $words_exceed_max = (bool) $words_exceed_max;
    
    if (!$words_exceed_max) {
        return $format_content;
    }
    
    $format_lower_words = $format_content_word_s;
    $format_lower_words = array_map('strtolower', $format_lower_words);
    $format_lower_words = array_map('trim', $format_lower_words);
    $format_lower_words = (array) $format_lower_words;
    
    if (empty($format_lower_words)) {
        return $format_content;
    }
    
    $keyword_indexes = array();
    
    foreach ($keywords as $key => $keyword) {
        
        $keyword_lower = $keyword;
        $keyword_lower = trim($keyword_lower);
        $keyword_lower = strtolower($keyword_lower);
        
        $keyword_pos = false;
        
        if ($exact) {
            
            $keyword_pos = array_search($keyword_lower, $format_lower_words);
            
        } else {
            foreach ($format_lower_words as $f_key => $f_word) {
                
                $f_is_match = true;
                $f_is_match = ($f_is_match && strstr($f_word, $keyword_lower));
                $f_is_match = (bool) $f_is_match;
                
                if ($f_is_match) {
                    $keyword_pos = $f_key;
                    break;
                }
                
            }
        }
        
        if (is_numeric($keyword_pos) == false) {
            continue;
        }
        
        $keyword_indexes[$key] = $keyword_pos;
        
    }
    
    if (empty($keyword_indexes)) {
        return $format_content;
    }
    
    $keyword_side_s = array();
    
    foreach (array_keys($keyword_indexes) as $k_key => $k_index) {
        
        $k_position = $keyword_indexes[$k_index];
        $k_position = intval($k_position);
        
        $left_slice           = array();
        $left_slice['offset'] = $k_position > $max_words ? $k_position - $max_words : 0;
        $left_slice['len']    = $k_position > $max_words ? $max_words : $k_position;
        
        if ($k_position > 0) {
            $array_left = array_slice($format_content_word_s, $left_slice['offset'], $left_slice['len'], true);
            $array_left = (array) $array_left;
        } else {
            $array_left = array();
        }
        
        $right_slice           = array();
        $right_slice['offset'] = $k_position + 1;
        $right_slice['len']    = $max_words - 1;
        
        $array_right = array_slice($format_content_word_s, $right_slice['offset'], $right_slice['len'], true);
        $array_right = (array) $array_right;
        
        $keyword_sides          = array();
        $keyword_sides['left']  = $array_left;
        $keyword_sides['right'] = $array_right;
        
        $s_result = array();
        
        $keywords_side_loop = array();
        $keywords_side_loop = array_keys($keyword_indexes);
        $keywords_side_loop = (array) $keywords_side_loop;
        
        foreach ($keywords_side_loop as $x_key) {
            
            $x_is_k = true;
            $x_is_k = ($x_is_k && ($k_index == $x_key));
            $x_is_k = (bool) $x_is_k;
            
            if ($x_is_k) {
                continue;
            }
            
            $x_key_pos = $keyword_indexes[$x_key];
            
            foreach ($keyword_sides as $kw_s_key => $kw_s_values) {
                
                if (array_key_exists($kw_s_key, $s_result)) {
                    continue;
                }
                
                $kw_s_is_valid = true;
                $kw_s_is_valid = ($kw_s_is_valid && !empty($kw_s_values));
                $kw_s_is_valid = ($kw_s_is_valid && !array_key_exists($x_key_pos, $kw_s_values));
                $kw_s_is_valid = (bool) $kw_s_is_valid;
                
                if ($kw_s_is_valid) {
                    $s_result[$kw_s_key] = $kw_s_values;
                } else {
                    $s_result[$kw_s_key] = array();
                }
                
            }
            
        }
        
        if (empty($s_result)) {
            $s_result = $keyword_sides;
        }
        
        $create_right_slice = true;
        $create_right_slice = ($create_right_slice && empty($s_result['right']));
        $create_right_slice = ($create_right_slice && isset($keyword_indexes[$k_index + 1]));
        $create_right_slice = (bool) $create_right_slice;
        // $create_right_slice = true; // good debug point
        
        if ($create_right_slice) {
            $right_word_slice = array_slice($format_content_word_s, $k_position + 1, $keyword_indexes[$k_index + 1] - 1, true);
            $right_word_slice = (array) $right_word_slice;
        } else {
            $right_word_slice = array();
        }
        
        if ($right_word_slice && !empty($right_word_slice)) {
            $s_result['connect'] = $right_word_slice;
        } else {
            $s_result['connect'] = array();
        }
        
        $keyword_side_s[$k_position] = $s_result;
        
    }
    
    if (empty($keyword_side_s)) {
        return $format_content;
    }
    
    $first_key = $keyword_side_s;
    reset($first_key);
    $first_key = key($first_key);
    
    $keyword_side_s_keys          = array();
    $keyword_side_s_keys['start'] = $first_key;
    $keyword_side_s_keys['end']   = array_pop(array_keys($keyword_side_s));
    
    $keyword_result_s = array();
    
    foreach (array_keys($keyword_side_s) as $ks_key => $ks_position) {
        
        $ks_sides = $keyword_side_s[$ks_position];
        $ks_sides = (array) $ks_sides;
        
        $section_left_dots = !empty($keyword_result_s) ? $dots : "";
        $section_left_dots = (string) $section_left_dots;
        
        $section_right_dots = array_keys($keyword_side_s);
        $section_right_dots = isset($section_right_dots[$ks_key + 1]);
        $section_right_dots = $section_right_dots ? $dots : "";
        $section_right_dots = (string) $section_right_dots;
        
        $ks_word = $format_content_word_s[$ks_position];
        $ks_word = (string) $ks_word;
        
        $keyword_section = array();
        
        if (!empty($ks_sides['left'])) {
            $keyword_section[] = $section_left_dots;
            $keyword_section[] = implode(' ', $ks_sides['left']);
        }
        
        $keyword_section[] = $ks_word;
        
        if (!empty($ks_sides['connect'])) {
            $keyword_section[] = implode(' ', $ks_sides['connect']);
        }
        
        if (!empty($ks_sides['right'])) {
            $keyword_section[] = implode(' ', $ks_sides['right']);
            $keyword_section[] = $section_right_dots;
        }
        
        $keyword_section_s = $keyword_section;
        $keyword_section_s = array_map('trim', $keyword_section_s);
        $keyword_section_s = array_filter($keyword_section_s);
        $keyword_section_s = (array) $keyword_section_s;
        
        if (empty($keyword_section_s)) {
            continue;
        }
        
        $keyword_result_s = array_merge($keyword_result_s, $keyword_section_s);
        $keyword_result_s = (array) $keyword_result_s;
        
    }
    
    $keyword_result_str = $keyword_result_s;
    $keyword_result_str = array_map('trim', $keyword_result_str);
    $keyword_result_str = array_filter($keyword_result_str);
    $keyword_result_str = array_unique($keyword_result_str);
    $keyword_result_str = implode(' ', $keyword_result_str);
    
    if (empty($keyword_result_str)) {
        return $format_content;
    }
    
    if (!empty($keyword_side_s[$keyword_side_s_keys['start']]['left'])) {
        $keyword_result_str = $dots . $keyword_result_str;
    }
    
    if (!empty($keyword_side_s[$keyword_side_s_keys['end']]['right'])) {
        $keyword_result_str = $keyword_result_str . $dots;
    }
    
    return $keyword_result_str;
    
    
}