July 5, 2011 
Definition:
function is_protected_meta( $meta_key, $meta_type = null ) {}
Determine whether a meta key is protected
Parameters
- string $meta_key: Meta key
- $meta_type
Return values
returns:True if the key is protected, false otherwise.
Defined filters
- is_protected_meta
apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type )
Source code
function is_protected_meta( $meta_key, $meta_type = null ) {
$protected = ( '_' == $meta_key[0] );
return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type );
}
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A HitchHackers guide through WordPress 
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