请问如何按空行来分割txt文件

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Release： 2016-06-13 12:12:32

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请教怎么按空行来分割txt文件，
请教怎么按空行来分割txt文件，
比如txt文件 a.txt

内容如下：
啊啊啊啊
呃呃呃

111111
222222

嘎嘎嘎嘎
嘎嘎嘎

里面有空行，怎么按空行把它切割成一段段的字符串呢
------解决思路----------------------
如果是以空行来分割就要找两个换行(\r\n)了
$str='123
defsf

abc
1213

&*(
';
print_r(explode("\n\r",$str)); //相当于print_r(explode("\r\n\r\n",$str));
或者用正则
preg_match('/[^.]+?(?=\r\n\r\n)/',$str,$mat);
print_r($mat);
------解决思路----------------------

$s =<<< TXT<br />啊啊啊啊<br />呃呃呃<br /><br />111111<br />222222<br /><br />嘎嘎嘎嘎<br />嘎嘎嘎<br />TXT;<br /><br />$a = preg_split("/([\r\n]+)\\1/", $s);<br />print_r($a);

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Array<br />(<br />    [0] => 啊啊啊啊<br />呃呃呃<br />    [1] => 111111<br />222222<br />    [2] => 嘎嘎嘎嘎<br />嘎嘎嘎<br />)<br /><br />

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nbsp print str txt

source：php.cn

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