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<?php
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 );
}
?>

• Function Reference/sanitize key « WordPress Codex
  Description. Sanitize a string key. Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes and underscores are allowed.
  codex.wordpress.org
• #14910 (Simplify sanitize_key() and use it in more places ...
  sanitize_key() does some unnecessary work that can be eliminated. sanitize_user() is still being called in places where sanitize_key() should be used and can ...
  core.trac.wordpress.org
• Inconsistencies in sanitize_user and sanitize_key - WordPress Trac
  It seems to me that sanitize_user can perform inconsistently by returning a different string compared to the input when passed a previously sanitized string.
  core.trac.wordpress.org
• #20202 (Filter pre_post_type with sanitize_key()) – WordPress Trac
  Currently the post_type field is sanitized with sanitize_user(). It would make more sense to use sanitize_key() for this because. register_post_type() uses ...
  core.trac.wordpress.org

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