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debug_fopen

Open the file handle for debugging.This function is used for XMLRPC feature, but it is general purpose enough to be used in anywhere.

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debug_fclose

Close the debugging file handle.Technically, this can be used to close any file handle when the global $debug is set to 1 or true.

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dead_db

Load custom DB error or display WordPress DB error.If a file exists in the wp-content directory named db-error.php, then it will be loaded instead of displaying the WordPress DB error. If it is not found, then the WordPress DB error will be displayed instead.

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