PHP函数nl2br()与自定义函数nl2p()换行用法分析

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 " . str_replace("\n", "
", $text) . "
"; } ?> 

 /** * Returns string with newline formatting converted into HTML paragraphs. * * @param string $string String to be formatted. * @param boolean $line_breaks When true, single-line line-breaks will be converted to HTML break tags. * @param boolean $xml When true, an XML self-closing tag will be applied to break tags (
). * @return string */ function nl2p($string, $line_breaks = true, $xml = true) { // Remove existing HTML formatting to avoid double-wrapping things $string = str_replace(array('
', '
', '
', '
'), '', $string); // It is conceivable that people might still want single line-breaks // without breaking into a new paragraph. if ($line_breaks == true) return '
'.preg_replace(array("/([\n]{2,})/i", "/([^>])\n([^<])/i"), array("
\n
", ''), trim($string)).'
'; else return '
'.preg_replace("/([\n]{1,})/i", "
\n
", trim($string)).'
'; }