shell_exec将多行输出显示为单行

Question

I am trying to execute java file using shell_exec() command, but the output formatting is not as per the expectation. Here are the details

code:

 echo shell_exec("java WekaExample");

output:

 Accuracy of J48: 50.00% --------------------------------- Accuracy of PART: 50.00% --------------------------------- Accuracy of DecisionTable: 64.29% --------------------------------- Accuracy of DecisionStump: 21.43% --------------------------------- 

Expected Output:(As displayed when running the command in terminal)

  Accuracy of J48: 50.00%
  ---------------------------------
  Accuracy of PART: 50.00%
  ---------------------------------
  Accuracy of DecisionTable: 64.29%
  ---------------------------------
  Accuracy of DecisionStump: 21.43%
  ---------------------------------

Any type of help is deeply appreciated.

Answer 1

I think you just need to convert the newlines (which probably really is there in the raw output) to <br /> tags for your browser to render them on separate lines. Use nl2br(), like:

echo nl2br(shell_exec("java WekaExample"));

Or put <pre></pre> tags around your output instead so the newlines are actually printed as new lines.