php - 修改一个 php 限制文本函数，向其添加某种偏移量

Question

也许你们可以帮忙:

我有一个名为 $bio 的变量，其中包含生物数据。

$bio = "Hello, I am John, I'm 25, I like fast cars and boats. I work as a blogger and I'm way cooler then the author of the question";

我使用一组函数搜索 $bio 来搜索某个词，比方说 “author” 在该词周围添加一个 span 类，然后我得到:

$bio = "Hello, I am John, I'm 25, I like fast cars and boats. I work as a blogger and I'm way cooler then the <span class=\"highlight\">author</span> of the question";

我使用函数将文本限制为 85 个字符:

$bio = limit_text($bio,85);

问题 是 $bio 中的 "author" 之前有超过 80 个字符。当应用 limit_text() 时，我不会看到突出显示的词作者。

我需要的是让 limit_text() 函数正常工作，在末尾添加所有包含 span 类高亮的单词。像这样:

*"This is the limited text to 85 chars, but there are no words with the span class highlight so I am putting to be continued ... **author**, **author2** (and all the other words that have a span class highlight around them separate by comma "*

希望你明白我的意思，如果不明白，请发表评论，我会尽力解释得更好。

这是我的 limit_text() 函数:

function limit_text($text, $length){ // Limit Text
        if(strlen($text) > $length) {
        $stringCut = substr($text, 0, $length);
        $text = substr($stringCut, 0, strrpos($stringCut, ' '));
        }
        return $text;
    }

更新:

$xturnons = str_replace(",", ", ", $xturnons);
$xbio = str_replace(",", ", ", $xbio);

$xbio = customHighlights($xbio,$toHighlight); 
$xturnons = customHighlights($xturnons,$toHighlight);

$xbio = limit_text($xbio,85);
$xturnons = limit_text($xturnons,85);

customHighlights 函数添加高亮的 span 类:

function addRegEx($word){ // Highlight Words
        return "/" . $word . '[^ ,\,,.,?,\.]*/i';
    }
    function highlight($word){
        return "<span class='highlighted'>".$word[0]."</span>";
    }
    function customHighlights($searchString,$toHighlight){
        $searchFor = array_map('addRegEx',$toHighlight);
        $result = preg_replace_callback($searchFor,'highlight',$searchString);
        return $result;
    }

Answer 1

对 limit_text 函数的这种更改将获取文本，如果它比给定的 $length 长，则将其剪切。如果您将 $needle 传递给它，它将搜索第一次出现的它，并以它结束您的句子。

此外，如果文本在其实际长度之前被剪切，它会向其添加 $addition，同时仍保留 $length 个字符的限制。

我已经包含了一个用法和一个基于你给出的示例输出:

<?php
/**
*   $text - The text to cut from
*   $length - The amount of characters that should be returned
*   $needle - If needle is given and found in the text, and it is 
*             at least $length far from the start of the string - it will end the sentence with it.
*   $addition - If the sentence was cut in the middle, will add it to the end of it.
**/
function limit_text($text, $length, $needle="", $addition="...") { 
    if(strlen($text) > $length) {
        $length -= strlen($addition);

        $start = 0;
        $trimLast = true;
        if (!empty($needle)) {
            $needleStart = strpos($text, $needle);

            if ($needleStart > $length) {
                $length -= strlen($needle);
                $start = $needleStart + strlen($needle) - $length;
                $trimLast = false;
            }
        }

        $stringCut = substr($text, max(0, $start), $length);
        if ($start > 0) {
            $stringCut = substr($stringCut, strpos($stringCut, ' ')+1);
        }
        if ($trimLast) {
            $lastWhitespace = strrpos($stringCut, ' ');
            $stringCut = substr($stringCut, 0, $lastWhitespace);
        }

        // split into words (so we won't replace words that contain it in the middle)
        // and wrap $needle with <span class="highlighted"></span>
        if (!empty($needle)) {
            $words = explode(" ", $stringCut);
            $needles = array_keys($words, $needle);
            foreach ($needles as $needleKey) {
                $words[$needleKey] = "<span class=\"highlighted\">$needle</span>";
            }

            $stringCut = implode(" ", $words);
        }
        $text = $stringCut.$addition;
    }
    return $text;
}

$bio = "Hello, I am John, I'm 25, I like fast cars and boats. I work as a blogger and I'm way cooler then the author of the question";
$text = limit_text($bio, 85, "author");
var_dump($text);

输出:

string (111) "fast cars and boats. I work as a blogger and I'm way cooler then the <span class="highlighted">author</span>..."