To disable the frustrating fancy colors on PHP error reporting and error logs you just need to open your php.ini file and look for the following option:

html_errors = On

and disable it

html_errors = Off

When PHP displays an error, it has the capability of formatting the error message as HTML (for easier reading , they say). This directive controls whether the error message is formatted as HTML or not.

Fortunatelly, this directive is hardcoded to Off for the CLI SAPI.