The md5 function in PHP is used to hash or encrypt a string by calculating the md5 .
The syntax is:
md5 ('string', raw)
The string here is passed to encrypt the string and the raw is an optional field,which is the format of output.It uses the RSA Data Security for hashing purpose. if the raw field is TRUE it means Raw 16 character binary format or else if it is FALSE it means default. 32 character hex number
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