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popen

Description

The popen of Filesystem for PHP opens the process file pointer.

Syntax

popen(
    string $command,
    string $mode
): resource|false

Parameters

command

The command

mode

The mode

Return

Returns a file pointer identical to that returned by fopen(), except that it is unidirectional (may only be used for reading or writing) and must be closed with pclose(). This pointer may be used with fgets(), fgetss(), and fwrite(). When the mode is 'r', the returned file pointer equals to the STDOUT of the command, when the mode is 'w', the returned file pointer equals to the STDIN of the command.

If an error occurs, returns false.

Examples

1 · command mode

<?

$command = "/bin/ls";
$mode = "r";

$handle = popen($command, $mode);

pclose($handle);

2 · error
<?

error_reporting(E_ALL);

/* Add redirection so we can get stderr. */
$command = "/path/to/executable 2>&1";
$mode = "r";

$handle = popen($command, $mode);

    echo "$handle: " . gettype($handle) . "\n";

    $read = fread($handle, 2096);
    echo $read;

pclose($handle);