February 12, 2011 
Definition:
function sanitize_key( $key ) {}
Sanitize a string key.
Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes and underscores are allowed.
Parameters
- string $key: String key
Return values
returns:Sanitized key
Defined filters
- sanitize_key
apply_filters( 'sanitize_key', $key, $raw_key )
Source code
function sanitize_key( $key ) {
$raw_key = $key;
$key = strtolower( $key );
$key = preg_replace( '/[^a-z0-9_\-]/', '', $key );
return apply_filters( 'sanitize_key', $key, $raw_key );
}
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