PHP做的服务器端的PUSH

PHP做的PUSH
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/*------------------------------------------------------------------------------------
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Server push PHP3 script
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-------------------------------
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A very short routine to perform simple server push animation,
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with browser detection snippset. Server push work's only with
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Netscape 4.0 or higher.
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Author: Fabian Dennler, [email protected]
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Date:01.05.2000
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Insert the server push script like an image in your html file.
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i.e. <IMG SRC="campush.php3">
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------------------------------------------------------------------------------------*/
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// filelocation of the webcam image
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$filename= "cam.jpg";
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// how many time between push
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// for unbuffered output set to 1.
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$pause = "10";
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// how many time to pass to passthru fun
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// ction , don't set this to high for serve
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// r usage
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$PASSES = 20;
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/*------------------------------------------------------------------------------------
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for ($j=0;$j<=$PASSES;$j++) {
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$img[count($img)] = $filename;
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}
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/*------------------------------------------------------------------------------------
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/*------------------------------------------------------------------------------------*/
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/* Plot the Currrent Data Block of the image */
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/*------------------------------------------------------------------------------------*/
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function plot_cam() {
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global $filename,$img,$pause;
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$k = 0;
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Header("Content-type: multipart/x-mixed-replace;boundary=ThisRandomString");
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while ($img[$k]==$filename) {
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print("n--ThisRandomStringnn");
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Header("Content-type: text/plain");
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$cam = fopen($filename,"r");
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fpassthru($cam);
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fclose($cam);
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if ($pause) { sleep($pause);} // time between reload, usefull for server usage
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$k++;
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if ($k==count($img)) {
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echo("n--ThisRandomString--n");
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}
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}
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}
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/**************************************************************************************/
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Broser Detection is provided by Leon Atkinson <[email protected]>
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/*------------------------------------------------------------------------------------*/
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/* Get the name the browser calls itself and what version */
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$Browser_Name = strtok($HTTP_USER_AGENT, "/");
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$Browser_Version = strtok(" ");
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/* MSIE lies about its name */
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if(ereg("MSIE", $HTTP_USER_AGENT)) {
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$Browser_Name = "MSIE";
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$Browser_Version = strtok("MSIE");
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$Browser_Version = strtok(" ");
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$Browser_Version = strtok(";");
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}
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/* Opera isn't completely honest, either ... */
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/* Modificaton by Chris Mospaw <[email protected]> */
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if(ereg("Opera", $HTTP_USER_AGENT)) {
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$Browser_Name = "Opera";
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$Browser_Version = strtok("Opera");
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$Browser_Version = strtok("/");
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$Browser_Version = strtok(";");
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}
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/* try to figure out what platform, windows or mac */
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$Browser_Platform = "unknown";
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if(ereg("Windows",$HTTP_USER_AGENT)
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|| ereg("WinNT",$HTTP_USER_AGENT)
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|| ereg("Win95",$HTTP_USER_AGENT)) {
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$Browser_Platform = "Windows";
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}
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if(ereg("Mac", $HTTP_USER_AGENT)) {
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$Browser_Platform = "Macintosh";
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}
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if(ereg("X11", $HTTP_USER_AGENT)) {
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$Browser_Platform = "Unix";
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}
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if(($Browser_Platform == "Windows")){
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if($Browser_Name == "Mozilla") {
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if($Browser_Version >= 3.0) {
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}
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// SERVER PUSH WORK'S ONLY HERE :)
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if($Browser_Version >= 4.0) { plot_cam(); }
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}
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}
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elseif($Browser_Platform == "Macintosh") {
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if($Browser_Name == "Mozilla") {
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if($Browser_Version >= 3.0) {
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}
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// SERVER PUSH WORK'S ONLY HERE :)
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if($Browser_Version >= 4.0) {plot_cam();}
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}
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}
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elseif($Browser_Platform == "Unix") {
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if($Browser_Name == "Mozilla") {
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if($Browser_Version >= 3.0) {
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}
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// SERVER PUSH WORK'S ONLY HERE :)
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if($Browser_Version >= 4.0) { plot_cam();}
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}
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}
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exit;
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?>
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