What should I do if php echo does not display?

Solutions for php echo not displaying: 1. Add cache characters; 2. Clear the cache; 3. Clear the data cached by the server through "ob_end_clean()"; 4. Increase the timeout setting; 5. Just delete QS_SrvMinDataRate in httpd.conf.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

PHP echo does not display another one during debugging One reason

When executing a long-term PHP program, the intermediate ECHO does not output.

General solutions: add cache characters, clear cache, etc.

echo str_pad('', 1024*4);
flush();
ob_flush();

ob_end_clean() Silently clears the data cached on the server side. Other methods

also increase the timeout setting.

set_time_limit(0);
ini_set("max_execution_time",0);

When none of the above works, you can check the APACHE log to see if the QOS module has security filtering settings.

Test method, you can use

for ($i=0;$i<30;$i++){
  echo $i.
 flush();
sleep(1);
}

to see if it can be executed for 30 seconds. If not, there is a problem with the server.

Usually in httpd.conf, there may be QS_SrvMinDataRate 150 1200 causing truncation. Just remove it.

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