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debug_fwrite is deprecated since version 3.4.0!
Alternative: error_log()

debug_fwrite › WordPress Function

Since0.71

Deprecated3.4.0

› debug_fwrite ( $fp, $message )

Parameters: (2)	(mixed) $fp Unused. Required: Yes (string) $message Message to log. Required: Yes
Links:	https://www.php.net/manual/en/function.error-log.php
See:	error_log()
Defined at:	wp-includes/deprecated.php , line 2874
Codex:	developer.wordpress.org / debug_fwrite

Write contents to the file used for debugging.

Related Functions: debug_fopen, debug_fclose, doing_filter, wp_debug_mode, add_filter

Source

function debug_fwrite( $fp, $message ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'error_log()' );
	if ( ! empty( $GLOBALS['debug'] ) )
		error_log( $message );
}