把所有东西变成“......”之后; 这是句子中的第100个位置

Here I have a string: "status; status;" and so on... I need to cut the string from the status where string is longer than 100 chars

for example: "status; status; status; (here is longer than 100 chars) ..."

previously I did it with the array:

 if($length_of_string > 100)
 { 
     $number_of_elements = count($statuses_array);
     echo $statuses_array[$number_of_elements-1];
     echo ' ... ';
     } else {
     echo $string_of_statuses;
}

but it is not good

thank you in advance!

How about:

$l = strlen($status_string);
if ($l > 100) {
   //Split string into array of statuses, to not break last status
   $ls = explode(";",$status_string);
   $new_status = "";
   $i = 0;
   //Check if there is room for the next status in $new_status without passing 100 chars
   while (strlen($new_status) < 100) {
      $new_status .= $ls[$i].";";
      $i++;
   }
   $new_status = substr($new_status,0,-1)."...";
}

Edit: simplified code, as the last status apparently can surpass 100 chars, which actually makes it easier

If I am reading your question right, and I think I am: if a string is longer than 100 characters, append a ellipsis to the first 100 characters.

If so, then you don't necessarily need a regex, or a preg_replace. You can do it simply as follows:

$status_length = strlen($status_string);

$status = '';

if ($status_length > 100) {
   //get the substring up to the first 100 characters:
   $status = substr($status_string, 0, 100);

   //now append the ellipsis to it:
   $status .= '...';
}

echo $status;

your variable
$variable_text="status; status; status; status; status; status; status; status; status; status; status; status; statwus; status; status; status; status; status;";

a number after you want to add "..."
$characters=100;

count words in $variable_text
$words_number=preg_split("/[\s]+/", $variable_text);

Add words to the variable $words. If characters in the variable $words is less than variable $characters(100) a word is added to variable $result. If hundredth character is in a word "sta(100)tus;" this word is not added to variable $result

for($i=0;$i<=count($words_number);$i++){
    $words=$words." ".$words_number[$i];
    if(strlen($words)<$characters){
        $result=$words;
    }
}

if your variable $variable_text is bigger than variable $result add " ..." at the end

if(strlen($result)<strlen($variable_text)){
    $result=$result." ...";
}

show the result
echo $result;