Разделить строку с чтением по количеству слов

Этот код делает свое дело:

<?php

function SplitStringToParts($sourceInput, &$first, &$rest, $countWordsInFirst = 20)
{
    $arr_exploded = explode(" ", $sourceInput);

    $arr_part1 = array_slice($arr_exploded, 0, $countWordsInFirst);
    $arr_part2 = array_slice($arr_exploded, $countWordsInFirst);

    $first = implode(" ",$arr_part1);
    $rest = implode(" ",$arr_part2);    
}

$str = "str1 str2 str3 str4 str5 str6 str7 str8 str9 str10 str11 str12 str13 str14 str15 str16 str17 str18 str19 str20 str21 str22 str23 str24";

SplitStringToParts($str,$first,$rest,20);

echo $first."<br>";
echo $rest."<br>";

Выход:

str1 str2 str3 str4 str5 str6 str7 str8 str9 str10 str11 str12 str13 str14 str15 str16 str17 str18 str19 str20
str21 str22 str23 str24

Используйте функцию SplitStringToParts. В вашем случае вы должны называть это так: SplitStringToParts ($ term-> description, $ first, $ rest, 20);

После этого $first, $rest сохранит ваш результат

Нашел решение:

<?php
// sentence teaser
// this function will cut the string by how many words you want
function word_teaser($string, $count){
  $original_string = $string;
  $words = explode(' ', $original_string);

  if (count($words) > $count){
   $words = array_slice($words, 0, $count);
   $string = implode(' ', $words);
  }

  return $string;
}

// sentence reveal teaser
// this function will get the remaining words
function word_teaser_end($string, $count){
 $words = explode(' ', $string);
 $words = array_slice($words, $count);
 $string = implode(' ', $words);
  return $string;
}
?>

$string = "We are BrightCherry web design, and we're going to show you how to write a function to crop a string  by a certain amount of words."

//this will echo the first 10 words of the string
echo word_teaser($string, 10);

$string = "We are BrightCherry web design, and we're going to show you how to write a function to crop a string by a certain amount of words."

//this will echo the words after the first 10 words
echo word_teaser_end($string, 10);