substr with japanese characters issue
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i'm echoing japanese characters fine but when i try to substr and echo out part of the string it just turn to question marks ���

note: i set my header to utf-8 

    header('Content-Type: text/html; charset=utf-8');

and made the meta 
`<meta http-equiv="Content-type" content="text/html; charset=utf-8" />`

    $word = "せんせい";
    echo $word;       //works just fine
    
    echo substr($word,-1);    //now it just echoes �
    
    //this one also failed
    echo $word[0];    //echoes �

   
    
    