is_array foreach as

<?php
function plugin_event_hook_many( array $p_hooks ) {
    if( !is_array( $p_hooks ) ) {
        echo 'not array<br>';
        return;
    }

    

    foreach( $p_hooks as $t_event => $t_callbacks ) {
        echo "$t_event => $t_callbacks" . '<br>';
    }
}


plugin_event_hook_many( array('a'=>'b') );

echo '<hr>';
$a='b';
plugin_event_hook_many( $a );
echo '<hr>';

?>