(PECL blenc >= 5)
blenc_encrypt — Encrypt a PHP script with BLENC
blenc_encrypt ( string $plaintext , string $encodedfile [, string $encryption_key ] ) : string
Encrypt the plaintext content and write it into encodedfile
plaintext A source code to encrypt. Does not need to contain opening/closing PHP tags
encodedfile The filename where BLENC will save the encoded source.
encryption_key The key that BLENC will use to encrypt plaintext content. If not given BLENC will create a valid key.
BLENC will return the redistributable key that must be saved into key_file: the path of key_file is specified at runtime with the option blenc.key_file
Example #1 blenc_encrypt() example
<?php
/* read the PHP source code */
$source_code = file_get_contents("my_source_to_protect.php");
/* create the encrypted version */
$redistributable_key = blenc_encrypt($source_code, "my_source_encoded.php");
/* read which is the key_file */
$key_file = ini_get('blenc.key_file');
/* save the redistributable key */
file_put_contents($key_file, $redistributable_key, FILE_APPEND);
?>
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https://www.php.net/manual/en/function.blenc-encrypt.php