r - php exec() doesn't store the output in $output argument -

my index.php:

<?php     $n = 3;     exec("rscript my_script.r $n", $out);     var_dump($out); <? 

my_script.r:

#!/usr/bin/env rscript  <- as.numeric(commandargs(true)) rootkea <- mongodbconnect('rootkea') print(i:10) 

output:

array(0) { } 

shell output:

$ rscript my_script.r 3 loading required package: rjava loading required package: methods [1]  3  4  5  6  7  8  9 10 

---

interestingly php works expected if remove mongodbconnect line my_script.r modified my_script.r:

#!/usr/bin/env rscript  <- as.numeric(commandargs(true)) #rootkea <- mongodbconnect('rootkea') print(i:10) 

output:

array(1) { [0]=> string(27) "[1] 3 4 5 6 7 8 9 10" }  

shell output:

$ rscript my_script.r 3 loading required package: rjava loading required package: methods [1]  3  4  5  6  7  8  9 10 

i need have database connection , other processing in my_script.r before print result. how make exec store output in $out argument?

your code looks ok.

try ugly hack:

$temp = tempnam(null, null); $temp2 = tempnam(null, null); exec("rscript my_script.r $n > \"$temp\" 2> \"$temp2\""); $out = file_get_contents($temp); $err = file_get_contents($temp2); unlink($temp); unlink($temp2);