I'm new in php and R. My operating system is Ubuntu 14.04.

I use php to Run Rscript

php code :

exec("Rscript my_rscript.R $checkbox_input $checkbox_output");

Rscript code:

args <- commandArgs(TRUE)
len <- length(args)
all=matrix(0,1,len)
for(i in 1:len)
{
  all[1,i]=args[i]
}
goal=args[len]    
mydata <- read.csv("/home/user/normdata.csv",header=T)     
mydata <- mydata[,c(all)]    
n = names(mydata)    
temp1=paste(n[!n %in% goal],collapse = " + ")    
temp2=paste(goal,"~",temp1)    
write.table(temp2,file="/home/user/temp2.txt")   
temp3 <-as.formula(temp2)    
write.table(temp3,file="/home/user/temp3.txt")

It work fine on the terminal,but I need to run it through php, Because I want to let user choose their input value, So how do I fix this problem?? ( It will fail at temp3 <-as.formula(temp2) ,Maybe rscript can't use as.formula() ??)