拆分逗号分隔的字符串，但只用逗号分隔

Question

嗨，我有一个长字符串

0BV,0BW,100,102,108,112,146,163191,192,193,1D94,19339,1A1,1AA,1AE,1AFD,1AG,1AKF.......

我想通过 sub sting 将其显示在页面中

喜欢

0BV,0BW,100,102,108,112,146
163191,192,193,1D94,19339
1A1,1AA,1AE,1AFD,1AG,1AKF

我想做的是从字符串创建子字符串，长度为 100 个字符，但如果第 100 个字符不是逗号，我想检查字符串中的下一个逗号并以此分隔。

我尝试使用chunk()按字数拆分，但由于子串长度不同，在页面中显示不合适

$db_ocode   = $row["option_code"];

$exclude_options_array =    explode(",",$row["option_code"]);
$exclude_options_chunk_array = array_chunk($exclude_options_array,25);

$exclude_options_string = '';   
foreach($exclude_options_chunk_array as $exclude_options_chunk)
{
    $exclude_options_string .= implode(",",$exclude_options_chunk);
    $exclude_options_string .= "</br>";
}

请帮忙。提前致谢

Answer 1

取字符串，设置截断位置。如果该位置不包含逗号，则找到该位置之后的第一个逗号并在那里切断。简单

<?php

$string="0BV,0BW,100,102,108,112,146,163191,192,193,1D94,19339,1A1,1AA,1AE,1AFD";

$cutoff=30;
if($string[$cutoff]!=",")
  $cutoff=strpos($string,",",$cutoff);
echo substr($string,0,$cutoff);

Fiddle

Answer 2

(.{99})(?=,),|([^,]*),

您可以获取 easy.See 用于 20 个字符的演示，而不是拆分。

https://regex101.com/r/sH8aR8/37

Answer 3

使用 Hanky Panky 的回答我能够为我的问题提供完整的解决方案，非常感谢 Hanky panky。如果我的代码效率不高，请编辑它。

$string="0BV,0BW,100,102,108,112,146,163191,192,193,1D94,19339,1A1,1AA,1AE,1AFD";

for($start=0;$start<strlen($string);) {

       $cutoff=30;
       if(isset($string[$start+$cutoff]) && $string[$start+$cutoff]!=",") 
       {
          $cutoff=strpos($string,",",$start+$cutoff);        
       }
       else if(($start+$cutoff) >= strlen($string))
       {
          $cutoff = strlen($string);
       }
       else if($start >= 30)
       {
          $cutoff = $start + $cutoff;
       }

       echo substr($string,$start,$cutoff-$start)."\n";
       $start=$cutoff+1;
    }

Answer 4

万一python

ln=0
i=1
str='0BVAa,0BW,100,102,108,112,146,163191,192,193,1D94,19339,1A1,1AA,1AE,1AFD,1AG,1AKF'
for item in str:
    print (item),
    ln=ln+len(item)
    if ln/10>=i and item==',':
        print ""
        i=i+1

拆分逗号分隔的字符串，但只用逗号分隔

Split a comma separated string but only split by a comma

php

regex

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substring