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php 读取shell管道传输过来的内容

Jun 13, 2016 pm 12:18 PM
php shell No transmission content of pipeline read

暮夏,您好!
rainbird给您发了短消息:
已经写了不少后台运行的deamon了.用的挺顺手的,但是我现在想获取管道传过来的内容,不知道咋实现,类似echo "aaaa" |a.php,a.php怎么获得echo的内容,不知道您有什么高见.
今天收到一条消息,解决的方法给大家分享一下:
实际上,shell 的 | 实际上表示的是 前一个的 标准输出 作为后一个的标准输入。虽然实现是通过pipe来实现的,
但是你写php代码的时候不需要知道底层的运作。你直接作为标准输入读取就可以了:
下面是一个实验代码:

复制代码 代码如下:


$fp = fopen("php://stdin", "r");
$s = '';
while (!feof($fp))
{
$s .= fgets($fp, 128);
}
var_dump($s);
fclose($fp);
?>


测试方法:

复制代码 代码如下:


ls -lh | php php_read_pipe.php


Rainbird 还给出更加简单的代码:
file_get_contents('php://stdin')
如果是有很多数据要传输过来,一般来说,是每4K传输一次。
直到传输完成。那可能不能简单的使用:
file_get_contents('php://stdin')。这样的话,一直会在等待。
分开处理的话,能够,读取一定的量后处理一部分。然后释放掉一部分的内存。
比如我要遍历所有的文件。可以这样处理
find / | php php php_read_pipe.php
大家根据具体情况具体分析。
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