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, (*1)
Degenerate PKCS7 certificate only form., (*2)
composer require konomae/pkcs7-php
<?php
use Konomae\PKCS7\Degenerate;
// DER encoded X.509 certificate
$x509 = file_get_contents('/path/to/x509certificate.der');
$p7 = new Degenerate($x509);
// Same result of the command:
// openssl crl2pkcs7 -nocrl -certfile client.crt -outform PEM -out client.p7b.pem
$p7->toPEM();