exec()和传递给Python脚本的变量的问题

Question

在HTML中编写一些简单的嵌入式PHP来执行python脚本,该脚本使用一些循环来根据HTML表单中多个文件输入的可能性多次运行脚本.它适用于单数,但就目前而言,当运行多个文件时,它似乎重复一些,并且仔细检查,似乎第一次被python脚本收到的变量不正确.我不知道它为什么这样做,它可能是非常明显的.所有帮助赞赏.

$len = count($_FILES["inputFile"]["name"]);
 echo "length";
 echo $len;

 for($i = 0; $i < $len; $i++){
    $dataIn = $_FILES["inputFile"]["tmp_name"][$i];
    $originalName = $_FILES["inputFile"]["name"][$i];
    echo "TMP Name:";
    echo $dataIn;
    echo "OriginalName";
    echo $originalName;
    exec("python /home/will/public_html/OrderAnalyser.py '$dataIn' '$originalName' 2>&1",$output);
    foreach ($output as $out){
        echo $out;
        echo "<br />"; 
    }
 }

输出如下所示:

    Executing...

length2TMP Name:/var/www/tmp/phpHzJFtQOriginalNamemicro_b001.jsonAnalysis Starting on file:
Input File: /var/www/tmp/phpHzJFtQ
Original Name: micro_b001.json
"nodeID":20,

firstNode:
20
Finished Finding Argument Order,
List is as follows:
['20', '21', '22', '23', '24']
Top Node is:
24


There is NO subargument of node:
24


Analysis Complete
TMP Name:/var/www/tmp/php9vQumSOriginalNamemicro_b002.jsonAnalysis Starting on file:
Input File: /var/www/tmp/phpHzJFtQ
Original Name: micro_b001.json
"nodeID":20,

firstNode:
20
Finished Finding Argument Order,
List is as follows:
['20', '21', '22', '23', '24']
Top Node is:
24


There is NO subargument of node:
24


Analysis Complete
Analysis Starting on file:
Input File: /var/www/tmp/php9vQumS
Original Name: micro_b002.json
"nodeID":20,

firstNode:
20
Finished Finding Argument Order,
List is as follows:
['20', '21', '22', '23', '24']
Top Node is:
22


20
is child of
22


21
is child of
22


Subargument of node:
22
is:
Post Order


There is NO subargument of node:
20


There is NO subargument of node:
21


Analysis Complete
Completed...

从这里可以看出,一旦它完成第一个文件(micro_b001.json),它应该移动到micro_b002.PHP中的echo显示PHP中的变量是正确的,但是从python脚本看到的print显示它再次使用初始变量(micro_b001)运行.为什么会这样？正如你所看到的,一旦它由于某种原因再次运行第一个,它实际上正确运行第二个,然后完成.为什么这样做很奇怪？我只是想不出来.

(另外,我意识到这是易受攻击的代码等,现在它并不重要)

Answer 1

(按设计破坏)exec函数将命令的输出附加到给定数组:

参数

...

output

如果output参数存在,那么指定的数组将填充命令的每一行输出.\n此数组中不包含尾随空格,例如.请注意,如果数组已包含某些元素,exec()则会追加到数组的末尾.如果您不希望该函数附加元素,请unset()在将数组传递给它之前调用该数组exec().

(强调我的)

因此你的python程序正确执行两次.在第二个循环中,第一个命令的输出仍然存在$output,第二个命令的输出附加到此.

修复应该是:

unset($output);
exec("python /home/will/public_html/OrderAnalyser.py '$dataIn' '$originalName' 2>&1",$output);