发送到服务器时添加一些字符的Base64字符串

Question

I am working on an application and I am sending base64 encoded string of images to server. The string is correct and when I copy the string from XCode debugger window and generate image from PHP it generates a proper valid image. But When I send the same string through webservice it is adding some extra characters in the string and the image gets corrupted.

How to get these extra characters removed from this string.

Here is the base64 string for the image from XCode debugger:
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tLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uLj5OXm5+jp6vLz9PX29/j5+v/bAEMA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FABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFF
FABRRRQAUUUUAFFFFABRRRQB/9P6pooooAKKKKACiiigAooooAK+K/2ivn8d2a/9
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el6ejXAbcs0xMrp6bC+duPUYPqTQBn/CTwZL4L8JR2t6AL27b7TcDHKFgAsef9kD
n/azivT6KKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig
AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigD//V+qaKKKACiiig
AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig
AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooA//1vqmiiig
AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig
AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKAP/9f6
pooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig
AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig
D//Q+qaKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig
AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig
AooooA//2Q==

And here is the string echoed from server:

/9j/4AAQSkZJRgABAQAASABIAAD/4QBYRXhpZgAATU0AKgAAAAgAAgESAAMAAAABrnAAEAAIdpAAQAAAABAAAAJgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAABd6ADrnAAQAAAABAAABHgAAAAD/7QA4UGhvdG9zaG9wIDMuMAA4QklNBAQAAAAAAAA4QklNrnBCUAAAAAABDUHYzZjwCyBOmACZjs EJ /8AAEQgBHgF3AwEiAAIRAQMRAf/EAB8ArnAAEFAQEBAQEBAAAAAAAAAAABAgMEBQYHCAkKC//EALUQAAIBAwMCBAMFBQQEAAABrnfQECAwAEEQUSITFBBhNRYQcicRQygZGhCCNCscEVUtHwJDNicoIJChYXGBkaJSYnrnKCkqNDU2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6g4SFhoeIrniYqSk5SVlpeYmZqio6Slpqeoqaqys7S1tre4ubrCw8TFxsfIycrS09TV1tfY2drhrn4uPk5ebn6Onq8fLz9PX29/j5 v/EAB8BAAMBAQEBAQEBAQEAAAAAAAABAgMEBQYHrnCAkKC//EALURAAIBAgQEAwQHBQQEAAECdwABAgMRBAUhMQYSQVEHYXETIjKBCBRCrnkaGxwQkjM1LwFWJy0QoWJDThJfEXGBkaJicoKSo1Njc4OTpDREVGR0hJSlNUVVZXrnWFlaY2RlZmdoaWpzdHV2d3h5eoKDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKzrntLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uLj5OXm5 jp6vLz9PX29/j5 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Answer 1

As mentioned in the comments, every 64 chars a "rn" is inserted. Also, "+" are replaced with " ". Let's reverse that.
Define $s with your output string:

$chars = str_split($s);
for($i = 64; $i < strlen($s); $i+=66) {
    unset($chars[$i]);
    unset($chars[$i+1]);
}
$new_s = str_replace(" ", "+", implode($chars));

for($i = 0; $i < strlen($new_s); $i++){
    if($i > 0 && $i % 64 == 0)
        echo "<br />";
    echo $new_s[$i];
}

Demo: http://sandbox.onlinephpfunctions.com/code/33ef917c4403560c469d8e9eea2ae88b4c6b732e
Diff: https://www.diffchecker.com/ajAv578C