如何将字符串截断为PHP中的前20个单词？

Question

如何在PHP中删除20个单词后的字符串？

Answer 1

function limit_text($text, $limit) {
      if (str_word_count($text, 0) > $limit) {
          $words = str_word_count($text, 2);
          $pos = array_keys($words);
          $text = substr($text, 0, $pos[$limit]) . '...';
      }
      return $text;
    }

echo limit_text('Hello here is a long sentence blah blah blah blah blah hahahaha haha haaaaaa', 5);

输出:

Hello here is a long ...

Answer 2

将数字更改为下面3的数字20以获取前20个单词,或将其作为参数传递.下面演示了如何得到第3个字:(所以更改3以20更改默认值):

function first3words($s, $limit=3) {
    return preg_replace('/((\w+\W*){'.($limit-1).'}(\w+))(.*)/', '${1}', $s);   
}

var_dump(first3words("hello yes, world wah ha ha"));  # => "hello yes, world"
var_dump(first3words("hello yes,world wah ha ha"));   # => "hello yes,world"
var_dump(first3words("hello yes world wah ha ha"));   # => "hello yes world"
var_dump(first3words("hello yes world"));  # => "hello yes world"
var_dump(first3words("hello yes world.")); # => "hello yes world"
var_dump(first3words("hello yes"));  # => "hello yes"
var_dump(first3words("hello"));  # => "hello"
var_dump(first3words("a")); # => "a"
var_dump(first3words(""));  # => ""

Answer 3

到最近的空间

截断到目标字符的最近前空格.演示

• $str 要截断的字符串
• $chars 要剥离的字符数量可以被覆盖 $to_space
• $to_space boolean是否从$chars极限空间截断

功能

function truncateString($str, $chars, $to_space, $replacement="...") {
   if($chars > strlen($str)) return $str;

   $str = substr($str, 0, $chars);
   $space_pos = strrpos($str, " ");
   if($to_space && $space_pos >= 0) 
       $str = substr($str, 0, strrpos($str, " "));

   return($str . $replacement);
}

样品

<?php

$str = "this is a string that is just some text for you to test with";

print(truncateString($str, 20, false) . "\n");
print(truncateString($str, 22, false) . "\n");
print(truncateString($str, 24, true) . "\n");
print(truncateString($str, 26, true, " :)") . "\n");
print(truncateString($str, 28, true, "--") . "\n");

?>

产量

this is a string tha...
this is a string that ...
this is a string that...
this is a string that is :)
this is a string that is--

Answer 4

使用explode().

来自文档的示例.

// Example 1
$pizza  = "piece1 piece2 piece3 piece4 piece5 piece6";
$pieces = explode(" ", $pizza);
echo $pieces[0]; // piece1
echo $pieces[1]; // piece2

请注意,爆炸具有限制功能.所以你可以做点什么

$message = implode(" ", explode(" ", $long_message, 20));

Answer 5

试试正则表达式.

你需要一些能匹配20个单词(或20个单词边界)的东西.

所以(我的正则表达式非常糟糕,如果不准确的话,请纠正我):

/(\w+\b){20}/

以下是php中正则表达式的一些示例.

Answer 6

简单且完全配备的truncate()方法:

function truncate($string, $width, $etc = ' ..')
{
    $wrapped = explode('$trun$', wordwrap($string, $width, '$trun$', false), 2);
    return $wrapped[0] . (isset($wrapped[1]) ? $etc : '');
}

Answer 7

它不是我自己的创作,它是以前帖子的修改.积分去karim79.

function limit_text($text, $limit) {
    $strings = $text;
      if (strlen($text) > $limit) {
          $words = str_word_count($text, 2);
          $pos = array_keys($words);
          if(sizeof($pos) >$limit)
          {
            $text = substr($text, 0, $pos[$limit]) . '...';
          }
          return $text;
      }
      return $text;
    }

Answer 8

如果你在 Laravel 上编码use Illuminate\Support\Str

这是例子

Str::words($category->publication->title, env('WORDS_COUNT_HOME'), '...')

希望这有帮助。