word_wrap 自己来实现

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<?php
/* word_wrap($string, $cols, $prefix)
 *
 * Takes $string, and wraps it on a per-word boundary (does not clip
 * words UNLESS the word is more than $cols long), no more than $cols per
 * line. Allows for optional prefix string for each line. (Was written to
 * easily format replies to e-mails, prefixing each line with "> ".
 *
 * Copyright 1999 Dominic J. Eidson, use as you wish, but give credit
 * where credit due.
 */
    function word_wrap ($string, $cols = 80, $prefix = "") {

	$t_lines = split( "\n", $string);
        $outlines = "";

	while(list(, $thisline) = each($t_lines)) {
	    if(strlen($thisline) > $cols) {

		$newline = "";
		$t_l_lines = split(" ", $thisline);

		while(list(, $thisword) = each($t_l_lines)) {
		    while((strlen($thisword) + strlen($prefix)) > $cols) {
			$cur_pos = 0;
			$outlines .= $prefix;

			for($num=0; $num < $cols-1; $num++) {
			    $outlines .= $thisword[$num];
			    $cur_pos++;
			}

			$outlines .= "\n";
			$thisword = substr($thisword, $cur_pos, (strlen($thisword)-$cur_pos));
		    }

		    if((strlen($newline) + strlen($thisword)) > $cols) {
			$outlines .= $prefix.$newline."\n";
			$newline = $thisword." ";
		    } else {
			$newline .= $thisword." ";
		    }
		}

		$outlines .= $prefix.$newline."\n";
	    } else {
		$outlines .= $prefix.$thisline."\n";
	    }
	}
	return $outlines;
    }
?>

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作者:morannon   更新日期:2004-11-18
来源:http://morannon.the-infinite.org   浏览次数:

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