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Passing Input to a Program in PHP
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Passing Input to a Program in PHP

InfinityCoder December 26, 2016

You want to pass input to an external program run from inside a PHP script. For example, your database requires you to run an external program to index text and you want to pass text to that program.

Open a pipe to the program with popen(), write to the pipe with fputs() or fwrite(), and then close the pipe with pclose():

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$ph = popen('/usr/bin/indexer --category=dinner','w') or die($php_errormsg);
if (-1 == fputs($ph,"red-cooked chicken\n"))    { die($php_errormsg); }
if (-1 == fputs($ph,"chicken and dumplings\n")) { die($php_errormsg); }
pclose($ph)                                           or die($php_errormsg);

This example uses popen() to call the nsupdate command, which submits Dynamic DNS Update requests to name servers:

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$ph = popen('/usr/bin/nsupdate -k keyfile')               or die($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.

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