Error PHP

[scdias]

Open http://scdias.x10.mx/index1.php and show error "Internal Server Error"
If open a html page (http://scdias.x10.mx/index2.html) all works fine
The code that i have in index1.php is
<?php
echo $_SERVER['REMOTE_ADDR'];
?>

[descalzo]

Make sure the permissions for that file are set to 0644

[scdias]

Make sure the permissions for that file are set to 0644

yes.
the file permisson is 0644
I create a index3.php with the same code and set the permission to 0777 and i get the same error

[scdias]

I think that i have the problem resolved
The public_html folder premission was set to 777 and i change to 755 and now is working