February 12, 2011 
Definition:
function wp_parse_args( $args, $defaults = '' ) {}
Merge user defined arguments into defaults array.
This function is used throughout WordPress to allow for both string or array to be merged into another array.
Parameters
- string|array $args: Value to merge with $defaults
- array $defaults: Array that serves as the defaults.
Return values
returns:Merged user defined values with defaults.
Source code
function wp_parse_args( $args, $defaults = '' ) {
if ( is_object( $args ) )
$r = get_object_vars( $args );
elseif ( is_array( $args ) )
$r =& $args;
else
wp_parse_str( $args, $r );
if ( is_array( $defaults ) )
return array_merge( $defaults, $r );
return $r;
}
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A HitchHackers guide through WordPress 
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