Will php error reporting also display mysql errors?

I have this in my PHP code, which outputs MySql errors:

$res = mysql_query($sql) or die(mysql_error());

Will disabling 开发者_JAVA百科error reporting in php.ini cause these mysql errors not to show as well?

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No, because die() prints the string and exit. This has nothing to do with *error_reporting*. For production environment you should think about a logger to write such message to a file or somewhere, instead of printing it.