popen — Opens a pipe.
resource popen(command, mode);
string command: Command to
string mode: Connection
This function forks the program specified in command and opens a pipe to it. The pipe
can only be unidirectional; that is, only read or write
operations are allowed. The returned handle can be
treated like a file handle, using fgetss() , fgets() , and fputs() . The mode argument can be eitherr
(read) or w (write).
3.0.11: popen() mistakenly renamed to _popen() on Windows, thus issuing error
messages when trying to access popen() on
Example 342. Output a
directory using a pipe to ls
if(!$fh = popen("/bin/ls", "r"))
echo ("Could not fork ls");
$output = fgets($fh, 1024);
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
This material may be distributed only subject to the terms and conditions set forth
in the Open Publication License, v1.0 or later (the latest version is presently available at
The authors of this book have elected not to choose any options under the OPL. This online book was obtained
and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4
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