插件1：文本换行

<?php // Plug-in 1: Wrap Text// This is an executable example with additional code supplied// To obtain just the plug-ins please click on the Download link$text = "Treats of the place where Oliver Twist was born, and of the circumstances attending his birth.\nAmong other public buildings in a certain town, which for many reasons it will be prudent to refrain from mentioning, and to which I will assign no fictitious name, there is one anciently common to most towns, great or small: to wit, a workhouse; and in this workhouse was born; on a day and date which I need not trouble myself to repeat, inasmuch as it can be of no possible consequence to the reader, in this stage of the business at all events; the item of mortality whose name is prefixed to the head of this chapter.\nFor a long time after it was ushered into this world of sorrow and trouble, by the parish surgeon, it remained a matter of considerable doubt whether the child would survive to bear any name at all; in which case it is somewhat more than probable that these memoirs would never have appeared; or, if they had, that being comprised within a couple of pages, they would have possessed the inestimable merit of being the most concise and faithful specimen of biography, extant in the literature of any age or country.";echo "<font face='Courier New' size='2'>";echo PIPHP_WrapText($text, 71, 5);function PIPHP_WrapText($text, $width, $indent){   // Plug-in 1: Wrap Text   //   // This plug-in takes a string variable containing any   // text and then adds <br /> and   tags in the right   // places to make the text wrap and indent para starts.   // The arguments required are:   //   //    $text: Text to be modified   //    $width: Number of characters art which to wrap   //    $indent: Number of chars to indent para start   $wrapped    = "";   $paragraphs = explode("\n", $text);   foreach($paragraphs as $paragraph)   {      if ($indent > 0) $wrapped .= str_repeat(" ", $indent);            $words = explode(" ", $paragraph);      $len   = $indent;      foreach($words as $word)      {         $wlen = strlen($word);         if (($len + $wlen) < $width)         {            $wrapped .= "$word ";            $len     += $wlen + 1;         }         else         {            $wrapped = trim($wrapped);            $wrapped .= "<br />\n$word ";            $len     =  $wlen;         }      }      $wrapped = trim($wrapped);      $wrapped .= "<br />\n";   }   return $wrapped;}?>

 1.插件说明：

    插件1接受一个任意的字符串变量，在合适的位置插入<br/>和"&nbsp",并且设置段首缩进一定距离。它需要三个参数：

$text:需要换行的字符串变量。

$width:整数，表示在这个位置强制文本换行。

$indent:整数，表示段首缩进的字符个数