the problem isn't with your code. THE PROBLEM IS MOST LIKELY THE PASSWORD FORMAT IN YOUR DATABASE STRUCTURE. If you have your password format set to VARCHAR 50 or (which means; a variable character with a maximum length of 50), YOU WOULD NEED TO CHANGE THE LENGHT TO 80 OR 100 TO BE SAFE.
The reason for the above is that the Hash function in Code Igniter-4 tends to encrypt/convert characters into lengths greater than 50. So if the password format length is set to 50, the Database is forced to truncate/shorten the encrypted characters when they're getting saved into the Database which then creates a problem when you're trying to decrypt the password when using the Check or Password_Verify functions, because the complete length characters are no longer available for decryption.
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
CodeIgniter is a framework that is known for requiring a minimum amount of customization to get it up and running. This allows those who choose it to work at a good pace. It has been updated many times since its inception in 2006. Now the most recent version is 4.0.3.
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