robust find method

find-method.php

<?php

/**
 *
 */
function _find( $needle, $haystack, $is_key = false ) {

        if ( $is_key === true ) :
            return function( Callable $comparator ) use ( $needle ) {
                return call_user_func( $comparator, $needle );
	    }

	elseif ( array_key_exists( $needle, $haystack )) :
		
		return $haystack[ $needle ];

	elseif ( is_string( $needle ) &&
		is_array( $haystack ) ) :
		
		return in_array( $needle, $haystack );

	elseif ( is_array( $needle ) ) &&
		 ( count( $needle ) > 0 ) : 

		return array_filter( $needle, "_find" );

	elseif ( preg_match( $needle, $haystack ) ) :
		return preg_match( $needle, $haystack );

	elseif ( is_array( $haystack ) ) : 
		return function( Callable $fn ) use ( $haystack ) {
		    return call_user_func_array( $fn, $haystack );
		}

	endif;	


}