'How can I read and write php 5.6 error log?

I'm using Ubuntu 20.04.4 LTS, Apache/2.4.41, PHP 5.6.40-57.

When I call

error_log ('Page is not writable for save called)', 3, "/var/log/apache2/php_error.log");

there is nothing in /var/log/apache2/php_error.log. php_error.log file is exist, and it is 777.

When I open /var/log/apache2/error.log, this error log was added.

PHP Warning:  error_log(/var/log/apache2/error.log):
 failed to open stream: \xed\x97\x88\xea\xb0\x80 \xea\xb1\xb0\xeb\xb6\x80 in /var/www/html/moniwiki/wiki.php on line 1258, referer: https:/
/myhome.ddns.net:9443/moniwiki/wiki.php?015B
  1. why php_error.log is empty?
  2. how am I able to change these \xed.. character to normal character?
  3. what is \xed... and is there any website to decode these characters?
phpubuntuapache2php-5.6


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