How to get complete issuer name from cert.pem in php?

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// Path to cert.pem file
$certFile = '/path/to/cert.pem';

// Read the contents of the cert.pem file
$certContents = file_get_contents($certFile);

// Parse the certificate
$certResource = openssl_x509_read($certContents);

// Get the issuer name
$issuer = openssl_x509_parse($certResource)['issuer'];

// Convert the issuer name fields to a string
$issuerName = [];
foreach ($issuer as $key => $value) {
    $issuerName[] = "$key=$value";
}

// Join the issuer name fields with commas to form the complete issuer name
$issuerName = implode(', ', $issuerName);

// Output the complete issuer name
echo $issuerName;

// Free the certificate resource
openssl_x509_free($certResource);