PHP encryption and decryption function class

Introducing a relatively complete php encryption and decryption function class.

Encryption process:
Read the source file, encrypt it with base64_encode, and use the 52 uppercase and lowercase letters obtained by shuffling as the secret key for replacement
$c=strtr (ciphertext, corresponding to the letter to be replaced, the letter to be replaced);
Link the two secret keys and the ciphertext to form the main content of the file to be encrypted
Finally, according to the template format written in advance, combine the base64_decode, strtr, and substr commands respectively, and put the combined ciphertext into the template and base64_encode the encryption here,
Write the file to be encrypted.

Decryption process:
Read the file to be decrypted, intercept the string starting with eval, and then intercept hierarchically to obtain the ciphertext generated in the encryption template
base64_decode decryption to obtain the decrypted plaintext
Intercept the obtained name text, intercept the characters of the secret key ciphertext formed by the source file, and execute the intercepted characters through eval to assign the ciphertext to the predefined variable ($O0O000)
By executing base64_decode(strtr(substr($O0O000,52*2),substr($O0O000,52,52),substr($O0O000,0,52)));
Decrypt and write the decrypted content (plain text) to the file.

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