Md Obydullah's questions

On my CentOS 7, Memcached is running and working on SSH but not working in the PHP file. I've followed this article: https://www.mynotepaper.com/install-memcached-on-centos-7. This method was working fine on my previous server.

I've tested Memcached using telnet. It works fine.

$ telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
set test 0 100 5
Hello
STORED
get test
VALUE test 0 5
Hello
END

After storing data using telnet, I've tested on SSH via PHP command. It works too:

php -r '$c = new Memcached(); $c->addServer("127.0.0.1", 11211); var_dump( $c->getAllKeys() );'
array(1) {
  [0]=>
  string(4) "test"
}

But in PHP file, it doesn't work. The PHP code:

<?php
$c = new Memcached();
$c->addServer("127.0.0.1", 11211);
var_dump( $c->getAllKeys() );
?>

It always shows bool(false). Here's my PHP info's screenshot.

Could you please tell me what's my mistake?