Description:
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I have the following settings in php.in + phpinfo():

log_errors = On
error_log = "/var/log/apache/php_error.log"

Server API: Apache (mod_php)
Apache-Version: 1.3.31

But if I produce a php-error, this error gets logged into Apache error-log: /var/log/apache/error_log, and not into /var/log/apache/php_error.log, as configured. 

The reason was that mod_php not like mod_gzip and mod_ssl, loggs errors with rights of the apache child-process.  

The Apache user cannot create files in /var/log/apache, and cannot write to files owned by root. 

But there is no error-message in Apaches error_log, I would expect something like "could not open '/var/log/apache/php_error.log', permission denied". Only php-errors itself get logged into Apaches error_log. 

perhaps its a "feature request".