PHP Validator Class

This is a simple PHP Validator Class. It requires no dependencies. Fork it and have fun with it.

It's a standalone single file PHP class to use on your projects. It requires no dependencies or no framework.

What's New

• Date validation - Validate date format and date range
• Field alias - Set alias on field names for error messages
• Error messages - Generate error messages as associative array

How To Use

You only need only one file:

• Validator.php

You can run everything from the index.php file, see the file for usage.

Step 1 - Initialize

Before start

// Include the class file
require "Validator.php";

// Data to validate
$data = [
    "name" => "John Doe",
    "age" => 25,
    "email" => "john@example.com",
    "password" => "pass@123",
    "confirm_password" => "pass@123",
    "sex" => "male",
    "phone" => "1236547895",
    "dob" => "1998-07-11"
];

Create the class instance

$v = new Validator($data);

Use a associative array as data

Step 2 -

Run validation by chaining methods to the field() method. Check here to see description of every methods.

$v->field('name')->required()->alpha([' ']);
$v->field('age') ->required()->numeric()->min_val(14)->max_val(100);
$v->field('email')->required()->email();
$v->field('password')->required()->min_len(8)->max_len(16)->must_contain('@#$&')->must_contain('a-z')->must_contain('A-Z')->must_contain('0-9');
$v->field('confirm_password')->required()->equals($data['password']);
$v->field('sex')->enum(['male', 'female', 'others']);
$v->field('phone')->numeric()->min_len(10)->max_len(10);
$v->field('dob', 'date of birth')->date()->date_after('1998-01-01')->date_before('2002-12-31');

Make sure to run the field method on start of every method chain.

Step 3 -

Check if data is valid

if(!$v->is_valid()){
    // Print the error messages
    print_r($v->error_messages);
}

Properties

• array $error_messages - Get the list of generated error messages.

Methods

Some methods to use

Methods	Return	Description
field(str $name, str? $alias)	$this	Set the field name to start validation. param string $name - Name of the field/key as on data to validate. param string $alias - (optional) Alias use on error messages instead of field name.
set_response_messages(arr $messages)	void	Function to set/extend custom error. Use associative array of messages as the parameter. See the messages format on Validator.php file at line 20.
is_valid()	boolean	Check if all validations are successfull.

Here is a list of the validators currently available.

Validator	Description
required()	Check if the value exists.
alpha(arr $ignore)	Check if the value is alpha only. param array $ignore - (optional) add charectors to allow. Ex. ['@', ' ']
alpha_num()	Check if the value is alpha numeric only. param array $ignore - (optional) add charectors to allow. Ex. ['@', ' ']
numeric()	Check if the value is numeric only.
email()	Check if the value is a valid email.
max_len(int $size)	Check if length of the value is larger than the limit. param int $size - Max length of charectors of the value.
min_len(int $size)	Check if length of the value is smaller than the limit. param int $size - Min length of charectors of the value.
max_val(int $val)	Check if the value of intiger/number is not larger than the limit. param int $val - Max value of the number.
min_val(int $val)	Check if the value of intiger/number is not smaller than the limit. param int $val - Min value of the number.
enum(arr $list)	Check if the value is in the list. param array $list - List of valid values.
equals(mix $value)	Check if the value is equal. param mixed $value - Value to match equal.
date(string $date)	Check if the value is a valid date. param string $format - Format of the date. (ex. Y-m-d) Check out PHP Manual for more.
date_after(string $date)	Check if the date appeared after the specified date. param string $date - Use format Y-m-d (ex. 2023-01-15).
date_before(string $date)	Check if the date appeared before the specified date. param string $date - Use format Y-m-d (ex. 2023-01-15).
must_contain(str $chars)	Check if the value must contains some charectors. param string $chars - Set of chars in one string. Ex. "@#&abc123"
match(str $pattern)	Check if the value matchs a pattern. param string $patarn - Rejex pattern to match.

More

• You can change default error response messages on Validator.php at line 20.
• For the pattern of match() method, check out PHP Manual and W3Schools.
• To know more about date formats, check out PHP Manual.

LICENSE

MIT License