openssl_pkcs7_encrypt

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Supported Versions: PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8
Encrypt an S/MIME message
<?php openssl_pkcs7_encrypt(    string $input_filename,    string $output_filename,    OpenSSLCertificate|array|string $certificate,    ?array $headers,    int $flags = 0,    int $cipher_algo = OPENSSL_CIPHER_AES_128_CBC): bool