How to invoke web service

[win]

php code:
How to use PHP's base64 function? PHP code calls are much simpler 
 

PHP Code:

 
$api = 'https://aip.baidubce.com/rest/2.0/ocr/v1/general_basic?access_token=xxxxxxx';
$header = ['Content-Length: multipart/form-data'];

$file = '/data/image/a.png'; // Local image path
$image = base64_encode(file_get_contents($file));
$post = [ 
    'image' => $image,
];

$res = request_post($api, $post, $header); 


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The garbled problem of unicode characters is still not solved 

Can someone provide some methods? thanks