in_array() for checking whether something exists in an array.count() for checking how many items are in an array.preg_match(), strpos() for checking for occurrences of certain strings in other strings.mb_strlen() or strlen() for checking that a string has the expected number of characters.isset() and empty() for checking whether a variable exists and isn’t blank.Built-in PHP functions # Built-in PHP functionsīasic validation is doable using many built-in PHP functions, including these: There are at least three ways: built-in PHP functions, core WordPress functions, and custom functions you write. Validating the Data # Validating the Data
Validation can be performed by using JavaScript on the front end and by using PHP on the back end.
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