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<?php
// test.php
 
echo "<form action='test.php' method='get'>";
echo "試著輸入一個參數<input type='text' value='3' name='N' />";
echo "<br><input type='submit' />";
echo "</form>";
 
if(isset($_GET['N']))
{
  $N = $_GET['N'];
 
  // execute R script from shell
  // this will save a plot at temp.png to the filesystem
  exec("Rscript my_rscript.R $N");
 
  // return image tag
  $nocache = rand();
  echo("<img src='temp.png?$nocache' />");
}
?>
 

Main.java:1: error: class, interface, or enum expected
<?php
^
Main.java:1: error: class, interface, or enum expected
<?php
 ^
Main.java:1: error: class, interface, or enum expected
<?php
  ^
Main.java:5: error: class, interface, or enum expected
echo "????????<input type='text' value='3' name='N' />";
^
Main.java:6: error: class, interface, or enum expected
echo "<br><input type='submit' />";
^
Main.java:7: error: class, interface, or enum expected
echo "</form>";
^
Main.java:9: error: class, interface, or enum expected
if(isset($_GET['N']))
^
Main.java:15: error: class, interface, or enum expected
  exec("Rscript my_rscript.R $N");
  ^
Main.java:18: error: class, interface, or enum expected
  $nocache = rand();
  ^
Main.java:19: error: class, interface, or enum expected
  echo("<img src='temp.png?$nocache' />");
  ^
Main.java:20: error: class, interface, or enum expected
}
^
11 errors

Standard output is empty