which are php predefined functions

Answer 1

like in java script we give validation for form fields like that in php is there any predefined validations are there

Answer 2

@aditya Kumar thank you

Answer 3

You can define the functions for validations as per your requirements in a seperate php file,and include in various php files and use it.Hence it becomes a predefined function.For example consider below validation function,u can define it in a seperate file and use it in other php files where you need email vaidations.

$email = input($_POST["email"]);

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$emailErr = "Invalid format and please re-enter valid email";
}

Answer 4

no I am not asking that php validations

Answer 5

in 1 interview asked me that which are predefined validations in php

Answer 6

I am also not understanding the que