Validator

Data validation composer package.

Installation

Install using composer.

composer require codesvault/validator

Usage

$validator = Validator::validate(
    [
		'username'	=> 'required|stringOnly',
		'full_name'	=> 'stringWithSpace',
		'password'	=> 'required|min:8',
		'email'		=> 'required|email',
    ],
);

$data = $validator->getData();

It'll get data from $_REQUEST by default. But you also can pass data as second parameter.

$validator = Validator::validate(
	[
		'username'	=> 'required|stringOnly',
		'full_name'	=> 'stringWithSpace'
	],
	[
		'username'	=> 'abmsourav',
		'full_name'	=> 'Keramot UL Islam'
	]
);

Available Rules

Rule	Description
required	Check the value is present in the input data and is not empty.
email	Check the value is valid email address.
url	Check the value is valid url.
string	Check the value is string.
stringOnly	Check the value is only string charecters.
stringWithSpace	Check the value is string with space.
stringWithNumber	Check the value is string with number.
stringWithDash	Check the value is string with dash and underscore.
uppercase	Check the value is string with upper case.
lowercase	Check the value is string with lower case.
mixedCase	Check the value is string with upper and lower case.
stringWithSymbols	Check the value is string with symbols.
min	Check the value is greater than or equal to the given value.
max	Check the value is less than or equal to the given value.
integer	Check the value is integer.
sameValue	Check the value is same as the given value.
array	Check the value is an array.
each	validate each item of an array.

Examples

Basic Validation Rules

Required Rule

Ensures the field is present and not empty.

$validator = Validator::validate(
    ['username' => 'required'],
    ['username' => 'john_doe']  // ✅ Valid
);

// Invalid examples:
// ['username' => '']         // ❌ Empty string
// ['username' => null]       // ❌ Null value
// []                         // ❌ Missing field

Email Rule

Validates email address format.

$validator = Validator::validate(
    ['email' => 'email'],
    ['email' => '[email protected]']  // ✅ Valid
);

// Invalid examples:
// ['email' => 'invalid-email']     // ❌ Invalid format
// ['email' => '@example.com']      // ❌ Missing username
// ['email' => 'user@']             // ❌ Missing domain

URL Rule

Validates URL format.

$validator = Validator::validate(
    ['website' => 'url'],
    ['website' => 'https://example.com']  // ✅ Valid
);

// Also valid:
// ['website' => 'http://example.com']
// ['website' => 'ftp://files.example.com']

// Invalid examples:
// ['website' => 'not-a-url']       // ❌ Invalid format
// ['website' => 'example.com']     // ❌ Missing protocol

String Validation Rules

String Only (stringOnly)

Validates that the value contains only alphabetic characters.

$validator = Validator::validate(
    ['name' => 'stringOnly'],
    ['name' => 'John']  // ✅ Valid
);

// Invalid examples:
// ['name' => 'John123']            // ❌ Contains numbers
// ['name' => 'John Doe']           // ❌ Contains space
// ['name' => 'John-Doe']           // ❌ Contains dash

String with Spaces (stringWithSpace)

Validates strings that can contain alphabetic characters and spaces.

$validator = Validator::validate(
    ['full_name' => 'stringWithSpace'],
    ['full_name' => 'John Doe']  // ✅ Valid
);

// Also valid:
// ['full_name' => 'Mary Jane Watson']

// Invalid examples:
// ['full_name' => 'John123']       // ❌ Contains numbers
// ['full_name' => 'John-Doe']      // ❌ Contains dash

String with Numbers (stringWithNumber)

Validates strings that can contain alphabetic characters and numbers.

$validator = Validator::validate(
    ['username' => 'stringWithNumber'],
    ['username' => 'user123']  // ✅ Valid
);

// Also valid:
// ['username' => 'JohnDoe456']

// Invalid examples:
// ['username' => 'user 123']       // ❌ Contains space
// ['username' => 'user-123']       // ❌ Contains dash

String with Dash (stringWithDash)

Validates strings that can contain alphabetic characters, dashes, and underscores.

$validator = Validator::validate(
    ['slug' => 'stringWithDash'],
    ['slug' => 'hello-world_page']  // ✅ Valid
);

// Also valid:
// ['slug' => 'my_awesome_post']
// ['slug' => 'hello-world']

// Invalid examples:
// ['slug' => 'hello world']        // ❌ Contains space
// ['slug' => 'hello123']           // ❌ Contains numbers

Case Validation Rules

// Uppercase only
$validator = Validator::validate(
    ['code' => 'uppercase'],
    ['code' => 'HELLO']  // ✅ Valid
);

// Lowercase only
$validator = Validator::validate(
    ['tag' => 'lowercase'],
    ['tag' => 'hello']  // ✅ Valid
);

// Mixed case (both upper and lower case required)
$validator = Validator::validate(
    ['password' => 'mixedCase'],
    ['password' => 'HelloWorld']  // ✅ Valid
);

String with Symbols (stringWithSymbols)

Validates strings that can contain symbols and special characters.

$validator = Validator::validate(
    ['password' => 'stringWithSymbols'],
    ['password' => 'Pass@123!']  // ✅ Valid
);

// Also valid:
// ['password' => 'My$ecur3#Pass']

Length Validation Rules

Minimum Length (min)

Validates minimum length/size requirements.

// String minimum length
$validator = Validator::validate(
    ['password' => 'min:8'],
    ['password' => 'mypassword']  // ✅ Valid (10 characters)
);

// Number minimum value
$validator = Validator::validate(
    ['age' => 'min:18'],
    ['age' => 25]  // ✅ Valid
);

// Array minimum items
$validator = Validator::validate(
    ['tags' => 'min:2'],
    ['tags' => ['php', 'javascript', 'html']]  // ✅ Valid (3 items)
);

Maximum Length (max)

Validates maximum length/size requirements.

// String maximum length
$validator = Validator::validate(
    ['title' => 'max:100'],
    ['title' => 'Short Title']  // ✅ Valid
);

// Number maximum value
$validator = Validator::validate(
    ['score' => 'max:100'],
    ['score' => 85]  // ✅ Valid
);

// Array maximum items
$validator = Validator::validate(
    ['categories' => 'max:5'],
    ['categories' => ['tech', 'news']]  // ✅ Valid (2 items)
);

Data Type Rules

Integer Rule

Validates that the value is an integer.

$validator = Validator::validate(
    ['age' => 'integer'],
    ['age' => 25]  // ✅ Valid
);

// Also valid:
// ['age' => '30']              // ✅ String numbers are valid

// Invalid examples:
// ['age' => 25.5]              // ❌ Float value
// ['age' => 'twenty']          // ❌ Text value

Array Rule

Validates that the value is an array.

$validator = Validator::validate(
    ['tags' => 'array'],
    ['tags' => ['php', 'javascript']]  // ✅ Valid
);

// Invalid examples:
// ['tags' => 'php,javascript']     // ❌ String value
// ['tags' => 123]                  // ❌ Number value

Advanced Rules

Same Value (sameValue)

Validates that the field value matches a specific value.

$validator = Validator::validate(
    ['confirmation' => 'sameValue:yes'],
    ['confirmation' => 'yes']  // ✅ Valid
);

// For password confirmation:
$validator = Validator::validate(
    [
        'password' => 'required|min:8',
        'password_confirmation' => 'sameValue:' . $_POST['password']
    ],
    $_POST
);

Each Rule

Validates each item in an array against specified rules.

// Validate each email in an array
$validator = Validator::validate(
    ['emails' => 'each:email'],
    ['emails' => ['[email protected]', '[email protected]']]  // ✅ Valid
);

// Validate each item with multiple rules (`&` [AND] operator)
$validator = Validator::validate(
    ['usernames' => 'each:required&stringOnly&min:3'],
    ['usernames' => ['john', 'jane', 'mike']]  // ✅ Valid
);

// Validate each item with OR operator
$validator = Validator::validate(
    ['identifiers' => 'each:email,integer'],
    ['identifiers' => ['[email protected]', 12345]]  // ✅ Valid
);

Form validation with Combining Multiple Rules

You can combine multiple rules using the pipe (|) separator:

$validator = Validator::validate(
    [
        'username'	=> 'required|stringOnly|min:3|max:20',
        'email'		=> 'required|email',
        'password'	=> 'required|min:8|mixedCase',
        'age'		=> 'required|integer|min:18|max:100',
        'tags'		=> 'array|min:1|max:10',
        'skills'	=> 'each:stringOnly&min:2'
    ],
    [
        'username'	=> 'johndoe',
        'email'		=> '[email protected]',
        'password'	=> 'MySecure123',
        'age'		=> 25,
        'tags'		=> ['php', 'javascript'],
        'skills'	=> ['programming', 'design']
    ]
);

$data = $validator->getData();

Error Handling Example

If any data is invalid then error method will return error messages array. Otherwise it'll return empty array.

$validator = Validator::validate(
    [
        'username' => 'required|stringOnly|min:3',
        'email' => 'required|email'
    ],
    [
        'username' => 'ab',  // Too short
        'email' => 'invalid-email'  // Invalid format
    ]
);

$errors = $validator->error();
if ($errors) {
    // Handle validation errors
    foreach ($errors as $field => $message) {
        echo "Error in {$field}: {$message[0]}\n";
    }
}

$data = $validator->getData();