500 Internal Server Error on cPanel server with using PHP files

[Stephanie]

I'm facing errors as follows on the cPanel Server by using PHP files:

[error] [client *.*.*.*] Premature end of script headers: index.php
[error] [client *.*.*.*] File does not exist: /home/*username*/public_html/500.shtml
[error] [client *.*.*.*] /usr/bin/php: error while loading shared libraries: libplc4.so: failed to map segment from shared object: Cannot allocate memory
[error] [client *.*.*.*] Premature end of script headers: index.php
[error] [client *.*.*.*] File does not exist: /home/*username*/public_html/500.shtml

[KelvinSmith]

Check the RLimitMEM setting in the apache configuration with the following command: -

grep RLimitMEM /etc/httpd/conf/httpd.conf

Also you can increase the limit or comment the parameter in httpd.conf and restart service httpd

/etc/init.d/httpd restart