PHP/Utility Function/passthru

passthru() function works like exec(), except that the command output is automatically output.

 
Its syntax is: void passthru (string command [, int return_variable])
If return_variable is provided, it will be assigned the command return status.
use passthru() to view the uptime of the server
<?
  passthru("uptime");
?>

Using passthru() to Output Binary Data

 
<?php
if ( isset( $_REQUEST["image"] ) && file_exists( $_REQUEST["image"] ) ) {
  header( "Content-type: image/gif" );
  $image = $_REQUEST["image"];
  passthru(  "giftopnm $image |
        pnmscale -xscale .5 -yscale .5 |
        ppmquant 256 | ppmtogif" );
} else {
  print "The image ".$_REQUEST["image"]." could not be found";
}
?>

Using the PHP passthru() Function

 
<?php
        passthru("ls", $return_val);
        echo "Exit code of $return_val\n";
?>

void passthru ( string command [, int &return_var] ) runs an external program

 
<?
    passthru("who");
?>