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popen
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popen

Name

popen — Opens a pipe.

Synopsis

resource popen(command, mode); string command: Command to execute string mode: Connection mode

Returns

File pointer

Description

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).

Warning

3.0.11: popen() mistakenly renamed to _popen() on Windows, thus issuing error messages when trying to access popen() on Windows machines.

Example

Example 342. Output a directory using a pipe to ls

if(!$fh = popen("/bin/ls", "r"))
{
    echo ("Could not fork ls");
}

while(!feof($fh))
{
    $output = fgets($fh, 1024);
    echo ("$output<br>");
}

pclose($fh);

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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 http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.