I think it would be better if your application sended multiple requests (one request each 5 secs) to get data.
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Question
How does PHP4 process endless loops?
I want to display some value from database in realtime using PHP. Some application connects to the HTTP server and reads the output of my PHP script with the following structure:
<?
header("Content-type: text/plain");
# Connect to database
...
# Endless loop
while (true) {
sleep(5); # Sleep 5 seconds
# Execute the database query
...
echo("...\n"); # Echo results
flush(); # Flush output buffer
}
?>
My configuration is Apache 2.0.52 + php4
What happens when the application closes the TCP connection? Has the script below shutdown correctly? Are the resources allocated for the script instance freed?
The links to the corresponding docs are greatly appreciated.
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Answers
DanFG: Thank you. Now it is clear for me: when the connection is aborted (by client) or timed out (in the case that the channel fails) the script execution is terminated and all resources (such as database handles) are freed. I can use the PHP's register_shutdown_function
ZhaawZ: Why?
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by: DanFGPosted on 2005-07-15 at 15:57:38ID: 14455500
msa2003, PHP usually frees any allocated resources automatically when connection times out or is aborted.
You can register functions to take care of freeing resources by using PHP's register_shutdown_function
Regarding your question, PHP handles endless loops by establishing a time limit for every process. The timeout is usually 30 seconds, it can be set on php.ini or with the set_time_limit() function (http://www.php.net/manual