Base64文字列をサーバーに送信していくつかの文字を追加するとき

Question

私はアプリケーションで作業していて、base64でエンコードされたイメージの文字列をサーバーに送信しています。文字列は正しいですし、XCodeデバッガウィンドウから文字列をコピーし、PHPから画像を生成すると、適切な有効な画像が生成されます。しかし、webserviceで同じ文字列を送信すると、文字列に余分な文字が追加され、画像が壊れてしまいます。

これらの余分な文字をこの文字列から削除する方法。ここで

はXCodeのデバッガからの画像のためのbase64文字列です：

/9j/4AAQSkZJRgABAQAASABIAAD/4QBYRXhpZgAATU0AKgAAAAgAAgESAAMAAAAB 
AAEAAIdpAAQAAAABAAAAJgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAABd6AD 
AAQAAAABAAABHgAAAAD/7QA4UGhvdG9zaG9wIDMuMAA4QklNBAQAAAAAAAA4QklN 
BCUAAAAAABDUHYzZjwCyBOmACZjs+EJ+/8AAEQgBHgF3AwEiAAIRAQMRAf/EAB8A 
AAEFAQEBAQEBAAAAAAAAAAABAgMEBQYHCAkKC//EALUQAAIBAwMCBAMFBQQEAAAB 
fQECAwAEEQUSITFBBhNRYQcicRQygZGhCCNCscEVUtHwJDNicoIJChYXGBkaJSYn 
KCkqNDU2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6g4SFhoeI 
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4uPk5ebn6Onq8fLz9PX29/j5+v/EAB8BAAMBAQEBAQEBAQEAAAAAAAABAgMEBQYH 
CAkKC//EALURAAIBAgQEAwQHBQQEAAECdwABAgMRBAUhMQYSQVEHYXETIjKBCBRC 
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IicnJycnLCwsLCwsLCwsLP/bAEMBBwcHCwoLEwoKEy4fGh8uLi4uLi4uLi4uLi4u 
Li4uLi4uLi4uLi4uLi4uLi4uLi4uLi4uLi4uLi4uLi4uLi4uLv/dAAQAGP/aAAwD 
AQACEQMRAD8A+qaKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK 
KKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK 
KKACiiigAooooA//0PqmiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK 
KKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK 
KKACiiigAooooAKKKKAP/9H6pooooAKKKKACiiigAooooAKKK5rxlr6eF/C+o68x 
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6/8ALW7IlOfZcBB9Qua9QooAaqqihEAVVGABwABTqKKACiiigAooooAKKKKACiii 
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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== 

そして、ここでは、文字列は、サーバからエコーです：

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Answer 1

コメントで述べたように、すべての64文字」 rn "が挿入されます。また、「+」は「」で置き換えられます。それを逆にしよう。

$chars = str_split($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]; 
} 

デモ：http://sandbox.onlinephpfunctions.com/code/33ef917c4403560c469d8e9eea2ae88b4c6b732e
差分：https://www.diffchecker.com/ajAv578C