PHP Form Validation Library

Performs Server-Side validation of HTML Forms

Downloading and implementation

• Download the zip file manually and include in your project directory
  OR (Using Composer)
  run command composer require muhammadsiyab/form_validation
• Include Form_Validation library

  require_once './vendor/autoload.php'; 

Validating form

<?php

// Instantiate `Form_Validation` Class
$form_validation = new \FormValidation\Form_Validation();


// Array containing custom messages 
// (Optional parameter, if not passed, default error messages will be used)

$messages = array(
    'required' => '{field} is cumpolsary',
    'max_length' => '{field} must be in limit of {limit}',
    'min_length' => '{field} must be at least of {limit} characters',
    'regex' => '{field} must be in specific pattern'
);


// Validation rules
$form_validation->validate(array('field_name', 'field_label', 'required|>10|<3', $messages));


// Check whether a record exists in database
$form_validation->exists('field_name|field_label', 'localhost|user|password|db_name', 'table_name|column_name', 'custom_error');


// Check
if ($form_validation->is_form_ok() === false) {
    
    // Custom error markup
    $form_validation->set_error_markup('<li>', '</li>');
    
    // Showing validation errors
    $errors = $form_validation->show_validation_errors();
    
    for ($i = 0; $i < count($errors); $i++) {

        echo $errors[$i];
        
    }
    
} else {
        
        // Do something here
    
}

Available methods

1. validate

Validates the form using specified rules

Parameters:

• array $config Array that contains validation configuration

  Example

  array('field_name', 'field_label', 'validation_rules_separated_with_pipe', array_containing_custom_messages)

2. exists

Checks whether a value already exists in database

Parameters:

• string $field Data related with field e.g name & label

  Example

  'field_name|field_label'

• string $db Database connection details e.g host, user, password & database name

  Example

  'localhost|user|password|db_name'

• string $table Data related with table e.g table name & column name

  Example

  'table_name|column_name'

• string $error (Optional) Custom error to show

3. set_error_markup

Sets custom markup for validation errors

• string $opening_markup String containing opening markup

  Example

  '<span style="color: red">'

• string $closing_markup String containing closing markup

  Example

  '</span>'

4. show_validation_errors

@return type Array (Use for loop to iterate through errors)

Shows validation errors

5. is_form_ok

Checks whether validation is done with errors or not

Available validation rules

Rule	Description	Syntax
required	Checks if a field is empty	required
numeric	Checks if a field is not a number	numeric
email	Checks if email is invalid	email
url	Checks if url is invalid	url
ip	Checks if IP address is invalid	ip
min_length	Sets the minimum length of field	<6
max_length	Sets the maximum length of field	>10
regex	Performs regular expression for the field	matches/^[a-zA-Z0-9]/