Recipe 18.22 Passing Input to a Program
18.22.1 Problem
You want to pass input to an external
program run from inside a PHP script. You might, for example, use a
database that requires you to run an external program to index text
and want to pass text to that program.
18.22.2 Solution
Open a pipe to the program with popen(
)
, write to the pipe
with fputs( )
or fwrite( ), then
close the pipe with pclose(
):
$ph = popen('program arg1 arg2','w') or die($php_errormsg);
if (-1 == fputs($ph,"first line of input\n")) { die($php_errormsg); }
if (-1 == fputs($ph,"second line of input\n")) { die($php_errormsg); }
pclose($ph) or die($php_errormsg);
18.22.3 Discussion
This example uses popen(
) to call the
nsupdate command, which submits Dynamic DNS
Update requests to name servers:
$ph = popen('/usr/bin/nsupdate -k keyfile') or die($php_errormsg);
if (-1 == fputs($ph,"update delete test.example.com A\n")) { die($php_errormsg); }
if (-1 == fputs($ph,"update add test.example.com 5 A 192.168.1.1\n"))
{ die($php_errormsg); }
pclose($ph) or die($php_errormsg);
Two commands are sent to nsupdate via
popen( ). The first deletes the
test.example.com A record, and the second adds a
new A record for test.example.com with the
address 192.168.1.1.
18.22.4 See Also
Documentation on popen( ) at
http://www.php.net/popen and pclose(
) at http://www.php.net/pclose;
Dynamic DNS is described in RFC 2136 at
http://www.faqs.org/rfcs/rfc2136.html.
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