Php 是否按字符数将MySQL字段拆分为最接近的完整单词？

我有一个MySQL字段，用于标记格式的博客文章的正文。由于我使用的API，我只能发送3000个字符的块，但是我的一些帖子多达4500个字符，其中有2000多个字符，所以我不想手动拆分它们

我试图找出一个函数来检查列中每个字段的字符长度，如果超过3000个字符，该函数将把超过3000个字符（四舍五入到最接近的单词）的内容拆分为第二列。这超出了我以前处理过的功能范围，因此我希望朝着正确的方向推进。以下是我到目前为止所做工作的基础：

SELECT `Body` from `blogposts`
WHERE char_length(Body) > 3000
SET
Body2 = SUBSTRING(`Body`, 3001, char_length(Body))
Body = SUBSTRING(`Body`, 1, 3000)

由于它还没有完成，我还没有测试它。我不相信它会接近我想要的，但在测试之前，我仍在努力解决另外两个问题：

1） 如何将其放在最近一个单词的末尾（在3000个字符以下四舍五入），而不是正好在第3000个字符处拆分

2） 如果它试图用文字进行处理，它会在文本中的markdown/html上分解，例如将

拆分为

，如果这是第3000个字符

作为背景资料，我已通读了以下内容：

这些响应似乎提供了自定义函数来根据设置的长度分割字符串，尽管这些函数没有得到很好的解释/注释，所以我有点迷茫

如果在MySQL中做起来不容易，我愿意在PHP中处理这些数据

任何见解将不胜感激

update   `blogposts`

set     `Body2` = substring(`Body`,3000-instr(reverse(left(`Body`,3000)),' ')+1) 
       ,`Body` = left(`Body`,3000-instr(reverse(left(`Body`,3000)),' '))  

where   char_length(Body) > 3000
;

30个字符的演示

set @Body = 'My name is Inigo Montoya! You''ve killed my father, prepare to die!';

select  left(@Body,30-instr(reverse(left(@Body,30)),' '))         as field_1
       ,substring(@Body,30-instr(reverse(left(@Body,30)),' ')+1)  as field_2
;       

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完整示例

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该代码总是将字符串除以3000个字符，然后将其推送到数组中。无论字符长度是多少，都可以使用此代码块。不要忘记，如果文本的字符数小于3000，$bodyParts变量中只有一个元素

$bodyText; // That came from SQL Ex Query : SELECT body FROM blogposts
$bodyParts = [];
$lengthOfBody = strlen($bodyText);
if($lengthOfBody > 3000){
    $forLoopInt = ceil($lengthOfBody / 3000); // For example if your body text have 3500 characters it will be 2
    echo $forLoopInt;
    for($i = 0; $i<= $forLoopInt - 2; $i++){
        $bodyParts[] = substr($bodyText, ($i) * 3000 , 3000);
    }
    // lets fetch the last part
    $bodyParts[] = substr( $bodyText,($forLoopInt - 1) * 3000); 
}else{
    $bodyParts[] = $bodyText;
}
/* anyway if your body text have characters lower than 3000 , bodyParts array will contain just 1 element, if not it will have Ceil(Length of body / 3000) elements in it. */
var_dump($bodyParts);

$bodyText；//来自SQLEx查询：从blogposts中选择body
$bodyParts=[]；
$lengthOfBody=strlen（$bodyText）；
如果（$lengthOfBody>3000）{
$forLoopInt=ceil（$lengthOfBody/3000）；//例如，如果正文文本有3500个字符，则为2
echo$forLoopInt；
对于（$i=0；$iThanks-我正在尝试运行它，但我对这里的子项有点困惑。我想我只需要将任何（at）正文更改为我的列名，但在“字段列表”中出现错误“未知列”正文，所以我想我需要更改集合（at）Body换了别的东西？@AdamS.Cochran，忘了把30换成3000。现在改了吗谢谢！我想我还需要把select换成update来做一个永久性的改变？从测试来看效果不错。@AdamS.Cochran，是的。请备份你的表（创建一个副本）在更新之前。保存这些结果时似乎需要做一些更复杂的事情。因为在更新中使用选择函数似乎不可行？
create table `blogposts` (`Body` varchar(3000),`Body2`  varchar(3000));

insert into blogposts (`Body`) values

 ('Hello darkness, my old friend'                          )
,('I''ve come to talk with you again'                      )
,('Because a vision softly creeping'                       )
,('Left its seeds while I was sleeping'                    )
,('And the vision that was planted in my brain'            )
,('Still remains'                                          )
,('Within the sound of silence'                            )
,('In restless dreams I walked alone'                      )
,('Narrow streets of cobblestone'                          )
,('''Neath the halo of a street lamp'                      )
,('I turned my collar to the cold and damp'                )
,('When my eyes were stabbed by the flash of a neon light' )
,('That split the night'                                   )
,('And touched the sound of silence'                       )
,('And in the naked light I saw'                           )
,('Ten thousand people, maybe more'                        )
,('People talking without speaking'                        )
,('People hearing without listening'                       )
,('People writing songs that voices never share'           )
,('And no one dared'                                       )
,('Disturb the sound of silence'                           )
;

select  left(`Body`,30-instr(reverse(left(`Body`,30)),' '))         as Body
       ,substring(`Body`,30-instr(reverse(left(`Body`,30)),' ')+1)  as Body2

from    `blogposts`

where   char_length(Body) > 30
;

+------------------------------+---------------------------+
| Body                         | Body2                     |
+------------------------------+---------------------------+
| I've come to talk with you   | again                     |
+------------------------------+---------------------------+
| Because a vision softly      | creeping                  |
+------------------------------+---------------------------+
| Left its seeds while I was   | sleeping                  |
+------------------------------+---------------------------+
| And the vision that was      | planted in my brain       |
+------------------------------+---------------------------+
| In restless dreams I walked  | alone                     |
+------------------------------+---------------------------+
| 'Neath the halo of a street  | lamp                      |
+------------------------------+---------------------------+
| I turned my collar to the    | cold and damp             |
+------------------------------+---------------------------+
| When my eyes were stabbed by | the flash of a neon light |
+------------------------------+---------------------------+
| And touched the sound of     | silence                   |
+------------------------------+---------------------------+
| Ten thousand people, maybe   | more                      |
+------------------------------+---------------------------+
| People talking without       | speaking                  |
+------------------------------+---------------------------+
| People hearing without       | listening                 |
+------------------------------+---------------------------+
| People writing songs that    | voices never share        |
+------------------------------+---------------------------+

update  `blogposts`

set     `Body2` = substring(`Body`,30-instr(reverse(left(`Body`,30)),' ')+1) 
       ,`Body`  = left(`Body`,30-instr(reverse(left(`Body`,30)),' '))        

where   char_length(`Body`) > 30
;

select  `Body`
       ,`Body2`

from    `blogposts`

where   `Body2` is not null
;

+------------------------------+---------------------------+
| Body                         | Body2                     |
+------------------------------+---------------------------+
| I've come to talk with you   | again                     |
+------------------------------+---------------------------+
| Because a vision softly      | creeping                  |
+------------------------------+---------------------------+
| Left its seeds while I was   | sleeping                  |
+------------------------------+---------------------------+
| And the vision that was      | planted in my brain       |
+------------------------------+---------------------------+
| In restless dreams I walked  | alone                     |
+------------------------------+---------------------------+
| 'Neath the halo of a street  | lamp                      |
+------------------------------+---------------------------+
| I turned my collar to the    | cold and damp             |
+------------------------------+---------------------------+
| When my eyes were stabbed by | the flash of a neon light |
+------------------------------+---------------------------+
| And touched the sound of     | silence                   |
+------------------------------+---------------------------+
| Ten thousand people, maybe   | more                      |
+------------------------------+---------------------------+
| People talking without       | speaking                  |
+------------------------------+---------------------------+
| People hearing without       | listening                 |
+------------------------------+---------------------------+
| People writing songs that    | voices never share        |
+------------------------------+---------------------------+

$bodyText; // That came from SQL Ex Query : SELECT body FROM blogposts
$bodyParts = [];
$lengthOfBody = strlen($bodyText);
if($lengthOfBody > 3000){
    $forLoopInt = ceil($lengthOfBody / 3000); // For example if your body text have 3500 characters it will be 2
    echo $forLoopInt;
    for($i = 0; $i<= $forLoopInt - 2; $i++){
        $bodyParts[] = substr($bodyText, ($i) * 3000 , 3000);
    }
    // lets fetch the last part
    $bodyParts[] = substr( $bodyText,($forLoopInt - 1) * 3000); 
}else{
    $bodyParts[] = $bodyText;
}
/* anyway if your body text have characters lower than 3000 , bodyParts array will contain just 1 element, if not it will have Ceil(Length of body / 3000) elements in it. */
var_dump($bodyParts);