Base64 值不是有效图像

对于电子商务，我需要从 SOAP Web 服务获取产品图像。

Web 服务的图像以 base64 编码。在我这边，我必须解码它们以将它们保存在 WordPress 目录中。

我的所有代码都有效（即使它远非完美）。唯一的问题是我无法从下面的 SOAP 响应中获取 base64 字符串。

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
    <RecupererPhotoProduitResponse xmlns="http://tempuri.org/">
        <RecupererPhotoProduitResult>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</RecupererPhotoProduitResult>
    </RecupererPhotoProduitResponse>
</soap:Body>
</soap:Envelope>

目前，我有这个代码：

$wsdl       = "https://sinex-saas.com/B00UWSUG9Z34TN22/Services/WebServiceStandard.asmx?WSDL"; 
$client     = new SoapClient($wsdl);
$password   = "???";
$username   = "???";

$optionsRecupererPhotoProduit = array(
            'user'      => $username,
            'password'  => $password,
            'codeFab'   => '????',
            'refFab'    => '????',
);

$responseRecupererPhotoProduit = $client->RecupererPhotoProduit($optionsRecupererPhotoProduit);
$responseRecupererPhotoProduit = $responseRecupererPhotoProduit->RecupererPhotoProduitResult;

但我的 responseRecoverPhotoProduct 变量中的字符串如下所示：

    ÿØÿà JFIF  x x  ÿÛ C        

+$.'+",#(7),01444'9=82<.342ÿÛ C         

2!!22222222222222222222222222222222222222222222222222ÿÀ PP" ÿÄ              
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我不明白为什么我不能得到像下面这样的正常东西，然后我可以使用：

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

Base64 字符串工作正常。

$imageString = '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';

file_put_contents("test.png", base64_decode($imageString));

该文件如下所示：

您需要做的就是解码 Base64 字符串并将其保存到文件中。