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Data Validation Theme Developer Handbook WordPress ...

    https://developer.wordpress.org/themes/theme-security/data-validation/
    Validating the Data # Validating the Data. There are at least three ways: built-in PHP functions, core WordPress functions, and custom functions you write. Built-in PHP functions # Built-in PHP functions. Basic validation is doable using many built-in PHP functions, including these: isset() and empty() for checking whether a variable exists and isn’t blank

Validating Sanitizing and Escaping User Data - WordPress

    https://codex.wordpress.org/Validating_Sanitizing_and_Escaping_User_Data
    Validating: Checking User Input. To validate is to ensure the data you've requested of the user matches what they've submitted. There are several core methods you can use for input validation; usage obviously depends on the type of fields you'd like to validate. Let's take a look at an example.
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