php僅在前100個字符後添加<br />

Question

如何在前100個字符後添加<br />？我的意思是打破一次，而不是每100個字符後加<br />。

$str="Apple has announced that co-founder, former CEO and chairman of the board Steve Jobs has passed away at the age of 56, so we take a look back at the famous innovator's life.At left, Steve Jobs, chairman of the board of Apple Computer, leans on the new 'Macintosh' personal computer following a shareholder's meeting Jan. 24, 1984, in Cupertino, Calif. The Macintosh was priced at $2,495."; 
//echo substr($str, 0, 100).'<br />'; this will break sentence after 100 characters. 
//echo wordwrap($str, 100, "\n<br />\n");this will add <br /> after each 100 characters. 

而我需要的是：

Apple has announced that co-founder, former CEO and chairman of the board Steve Jobs has passed away  
<br /> <-- only add here. 
at the age of 56, so we take a look back at the famous innovator's life.At left, Steve Jobs, chairman of the board of Apple Computer, leans on the new 'Macintosh' personal computer following a shareholder's meeting Jan. 24, 1984, in Cupertino, Calif. The Macintosh was priced at $2,495. 

Answer 1

您可以使用substr拿到第100個字符，並添加一個<br />當時和之後獲得的所有其它字符。例如：

<?php 
    echo substr($string , 0, 100) 
     , "<br />" 
     , substr($string, 100); 
?> 

Answer 2

$str="Apple has announced that co-founder, former CEO and chairman of the board Steve Jobs has passed away at the age of 56, so we take a look back at the famous innovator's life.At left, Steve Jobs, chairman of the board of Apple Computer, leans on the new 'Macintosh' personal computer following a shareholder's meeting Jan. 24, 1984, in Cupertino, Calif. The Macintosh was priced at $2,495."; 
$first_part = substr ($str ,0,100); 
$second_part = substr ($str ,100); //Goes to end of str 
$new = $first_part."<br />".$second_part; 

Answer 3

如果你的意思是寫而不是字符 「後100個字母分手」，然後substr不會做。並且wordwrap確實反覆工作。所以，你需要手動找到100個字母和注入休息有：

$str = preg_replace('/^.{100,}?\b/s', "$0<br>", $str); 

Answer 4

我會做這樣的事情

<? 
    $str="Apple has announced that co-founder, former CEO and chairman of the board Steve Jobs has passed away at the age of 56, so we take a look back at the famous innovator's life.At left, Steve Jobs, chairman of the board of Apple Computer, leans on the new 'Macintosh' personal computer following a shareholder's meeting Jan. 24, 1984, in Cupertino, Calif. The Macintosh was priced at $2,495."; 

    for ($i = 0; $i < strlen($str); $i += 99) 
    { 
     if ((strlen($str) - $i) < 100) { 
      echo substr($str, $i, strlen($str)); 
     } else { 
      echo substr($str, $i, 100); 
     } 

     echo "<br />"; 
    } 
?> 

Answer 5

PHP有一個功能在特定位置插入一個字符串到另一個，這就是所謂的substr_replace：

echo substr_replace($str, '<br>', 100, 0); 

如果您需要支持UTF-8（未指定任何編碼），你可以用正則表達式和做到這一點允許不剪的話，太：

echo preg_replace('/^.{80,120}+\b/su', '$0<br>', $str); 

Answer 6

這可能工作：

$text = "..."; 
if (isset($text[100])) { 
    $text[100] = $text[100] . "<br />"; 
}