Description:
------------
Trying to install crontab with PHP cli, system (and passthru) function returned error-code of "1" with output "no crontab for USER" (USER should be replaced with real system user to whom crontab should be installed).

the code is:
$ php -r '$c="crontab -u USER -l";system($c,$status); printf("%s (%d)\n",$c,$status);'

the output is:
no crontab for USER
crontab -u USER -l (1)

Since no crontab is been installed for the USER, the output was expected, but I don't think error code should be 1 for this.

For comparison, python and c++ both returns 256 of error code for this error ("no crontab for USER be installed").

According to an error code definition of unix system (in ubuntu, /usr/include/asm-generic/errno-base.h and errno.h), 1 be translated as "permission denied".

Followings are comparison code and result for other languages.
They returned error number 256 but PHP.

* c++
#include <iostream>
#include <cstdlib>
using namespace std;

int main(int argc,char *argv[]){
	string cmnd("crontab -u USER -l");
	int errcode=system(cmnd.data());
	printf(
		"%s (%d)\n",
		cmnd.data(),
		errcode
	);
	return 0;
}

root@server2:~/diary# ./a.out
no crontab for USER
crontab -u USER -l (256)

* python
root@server2:~/diary# python -c 'import os; c="crontab -u USER -l"; print "%s (%d)" % (c, os.system(c))'
no crontab for USER
crontab -u USER -l (256)

* php
root@server2:~/diary# php -r '$c="crontab -u USER -l";system($c,$status); printf("%s (%d)\n",$c,$status);'
no crontab for USER
crontab -u USER -l (1)

* error number refference
root@server2:~/diary# awk '/[\x20\t]+1[\x20\t]+/' /usr/include/asm-generic/errno-base.h
#define	EPERM		 1	// Operation not permitted



Reproduce code:
---------------
# make sure there's NO crontab installed for USER.

$ php -r '$c="crontab -u USER -l";system($c,$status); printf("%s (%d)\n",$c,$status);'


Expected result:
----------------
Output:
no crontab for USER
crontab -u USER -l (256)

Actual result:
--------------
Output:
no crontab for USER
crontab -u USER -l (1)