Turning php error off using htaccess, gives 500 error

[tunde011]

Options +FollowSymLinks 
RewriteEngine on 
RewriteCond %{HTTP_HOST} ^myurl.com [NC] 
RewriteRule ^(.*)$ http://www.myurl.com/$1 [L,R=301] 


Header set X-UA-Compatible "IE=EmulateIE8" 
# PHP error handling for production servers

# disable display of startup errors
php_flag display_startup_errors off

# disable display of all other errors
php_flag display_errors off

# disable html markup of errors
php_flag html_errors off

# enable logging of errors
php_flag log_errors on

# disable ignoring of repeat errors
php_flag ignore_repeated_errors off

# disable ignoring of unique source errors
php_flag ignore_repeated_source off

# enable logging of php memory leaks
php_flag report_memleaks on

# preserve most recent error via php_errormsg
php_flag track_errors on

# disable formatting of error reference links
php_value docref_root 0

# disable formatting of error reference links
php_value docref_ext 0

# specify path to php error log
php_value error_log /public_html/safe/PHP_errors.log

# specify recording of all php errors
php_value error_reporting 999999999

# disable max error string length
php_value log_errors_max_len 0

# protect error log by preventing public access
<Files /public_html/safe/PHP_errors.log>
 Order allow,deny
 Deny from all
 Satisfy All
</Files>
ErrorDocument 404 /404.php
ErrorDocument 400 /400.php
ErrorDocument 401 /401.php
ErrorDocument 403 /403.php
ErrorDocument 500 /500.php
Options -Indexes

That's my code, the funny thing is i copied this from a website i designed and it worked on their, but it won't work on a new website i am designing.
Any help will do

[sourcez]

If that new website is on a new server the hosting company probably have a different server config...are they using phpexec?

If they are you won't be able to change PHP settings from .htaccess.