How to remove blank lines in php

php去除空行的方法：首先通过“preg_replace("/(\r\n|\n|\r|\t)/i", '', $text);”语句去除多余的空格或换行；然后对Html里有连续的空行或tab给正则过滤掉即可。

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php：去掉多余的空行

<?php
$str="i   am    a     book\n\n\n\n\nmoth";
//去除所有的空格和换行符
echo preg_replace("/[\s]{2,}/","",$str).&#39;<br>&#39;;
//去除多余的空格和换行符，只保留一个
echo preg_replace("/([\s]{2,})/","\\1",$str);
//去除多余的空格或换行 $text = preg_replace("/(\r\n|\n|\r|\t)/i", &#39;&#39;, $text);
$lastSeveralLineContentsArr = preg_replace("/([ |\t]{0,}[\n]{1,}){2,}/","",$lastSeveralLineContentsArr);
//对Html里有连续的空行或tab给正则过滤掉>
?>

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