如何在 php 字符串中实现此目的 bbbvvvvzzxxc => 3v4v2z2xc

Question

如何使用 php 实现 php 字符计数：输入：bbbvvvvzzxxc输出：3b4v2z2xc我尝试这个代码：$str = "aabbbccaaaac";$arr1 = str_split($str);$count=1;foreach($arr1 as $key=>$char) {    if($key==0){        $pre=$char;       }    if($pre==$char){        $count++;      } else{        $count=1;        $pre=$char;    }echo $pre.'---'.$char.'__';    if($pre != $char){        echo $char. $count   ;     } else {     // echo $char;      }         }但不工作：设置字符数很简单

Answer 1

$str = "aabbbccaaaac";

$arr1 = str_split($str);

$count=0;

$pre = '';

$result = ''; // our result string

foreach($arr1 as $char){

  

   if($char == $pre){

      $count++;

   }else{

      

      if($count > 0){ // To check whether it was the first iteration

         $result .= $count.$pre;

      }

      $count = 1;

      $pre = $char;

   }

 

}

$result .= $count.$pre; // For last iteration

echo $result;