接近 100 个单词的句号后分页的 Php 代码

Question

我有一个测试区，它是来自数据库的动态文本，可能有数千个单词。我希望它中断并在每段中用句号将近 100 个(任意长度)单词作为一个段落。我能够在 100 个单词后中断，但不能完全停止。为了在 100 个(任意长度)单词后中断，我使用了以下函数。

function TrimString($String, $Length)
{
    if(strlen($String) > $Length)
    {
        $Temp[0] = substr($String, 0, $Length);
        $Temp[1] = substr($String, $Length);
        $SpacePos = strpos($Temp[1], ' ');
        if($SpacePos !== FALSE)
        {
            return $Temp[0].substr($Temp[1], 0, $SpacePos);
        }
    }
    return $String;
}

例子:-

function TrimString($String, $Length){
    if(strlen($String)<=$Length){
        $stringValue=$String;
    } else {
        $stringValue=substr($String,0,$Length) . '.';
    }
    return $stringValue;
}
$m=50;
$a="I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. ";
$data=TrimString($a,$m);
echo $data;

它给了我答案

I am a boy. I am a boy. I am a boy. I am a boy. I .

但我需要答案

I am a boy. I am a boy. I am a boy. I am a boy.

那么你能帮我找到接近提供给该函数的长度的句号并打断段落吗。

Answer 1

在此处添加句号(.)

 return $Temp[0].substr($Temp[1], 0, $SpacePos).".";

更新 2:

<?php
function TrimString($String, $Length){
    if(strlen($String)<=$Length){
        $stringValue=$String;
    } else {
        $new_l = strpos ($String , ".", $Length);
        $Length = $new_l+1;
        $stringValue=substr($String,0,$Length);
    }
    return $stringValue;
}
$m=50;
$a="I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. I am a boy. ";
$data=TrimString($a,$m);
echo $data;
?>

输出:

I am a boy. I am a boy. I am a boy. I am a boy. I am a boy.