Calling the Azure Storage REST API directly from PHP

Now that the Azure Storage PHP client is deprecated, Microsoft recommends calling the Azure Storage REST API directly. The only problem is, I have no idea where to start with doing this through PHP, and basically all the documentation I come across through Google and searching SO/SE is related to using the aforementioned composer client libraries.

Does anyone have a working example of how to, for example, upload a PDF attachment to a blob storage container by calling the API directly using PHP?

I've tried finding documentation specific to PHP on this subject and I have so far come up empty.

> Upload a PDF attachment to a blob storage container by calling the API directly using PHP?

You can use the below PHP code to upload the pdf file by calling the API directly.

Code:

<?php
$storageAccountname = 'your storage account name';
$accesskey = "your storage account access key";
$filepath = realpath('./sample1.pdf');
$containerName = 'test';
$blobName = 'demo.pdf';
$URL = "https://$storageAccountname.blob.core.windows.net/$containerName/$blobName";
function uploadBlob($filepath, $storageAccountname, $containerName, $blobName, $URL, $accesskey) {
$Date = gmdate('D, d M Y H:i:s \G\M\T');
$handle = fopen($filepath, "r");
$fileLen = filesize($filepath);
$headerResource = "x-ms-blob-cache-control:max-age=3600\nx-ms-blob-type:BlockBlob\nx-ms-date:$Date\nx-ms-version:2019-12-12";
$urlResource = "/$storageAccountname/$containerName/$blobName";
$arraysign = array();
$arraysign[] = 'PUT';               /*HTTP Verb*/  
$arraysign[] = '';                  /*Content-Encoding*/  
$arraysign[] = '';                  /*Content-Language*/  
$arraysign[] = $fileLen;            /*Content-Length (include value when zero)*/  
$arraysign[] = '';                  /*Content-MD5*/  
$arraysign[] = 'application/pdf';   /*Content-Type*/  
$arraysign[] = '';                  /*Date*/  
$arraysign[] = '';                  /*If-Modified-Since */  
$arraysign[] = '';                  /*If-Match*/  
$arraysign[] = '';                  /*If-None-Match*/  
$arraysign[] = '';                  /*If-Unmodified-Since*/  
$arraysign[] = '';                  /*Range*/  
$arraysign[] = $headerResource;     /*CanonicalizedHeaders*/
$arraysign[] = $urlResource;        /*CanonicalizedResource*/
$str2sign = implode("\n", $arraysign);
$sig = base64_encode(hash_hmac('sha256', urldecode(utf8_encode($str2sign)), base64_decode($accesskey), true));  
$authHeader = "SharedKey $storageAccountname:$sig";
$headers = [
'Authorization: ' . $authHeader,
'x-ms-blob-cache-control: max-age=3600',
'x-ms-blob-type: BlockBlob',
'x-ms-date: ' . $Date,
'x-ms-version: 2019-12-12',
'Content-Type: application/pdf',
'Content-Length: ' . $fileLen
];
$ch = curl_init();
curl_setopt ( $ch, CURLOPT_URL, $URL );
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
curl_setopt($ch, CURLOPT_INFILE, $handle); 
curl_setopt($ch, CURLOPT_INFILESIZE, $fileLen); 
curl_setopt($ch, CURLOPT_UPLOAD, true); 
$result = curl_exec($ch);
echo ('Uploaded successfully<br/>');
print_r($result);
curl_close($ch);
}
uploadBlob($filepath, $storageAccountname, $containerName, $blobName, $URL, $accesskey);

Output:

Portal: