PHP Form Validation Class
Loosely patterned on the interface from the Codeigniter form validation library, but written from scratch in PHP 5.3+. No dependencies. Includes a full set of unit tests in PhpUnit format.
Originally written to use with various Micro-frameworks as they (generally) don't have this included and I couldn't find a no-dependencies library that I liked that someone else had written.
I didn't include tests like "is_unique" that introduce awkward dependencies. These are very easy to add using closure callbacks and then they can be tailored exactly to the application.
Basic usage:
<?php
namespace Test; //whatever this namespace is
use \Libraries as Lib; //FormValidation lives in "Libraries" as standard
//pull in the Class for testing
define('FCPATH', TRUE); //defeat check to prevent direct script execution
require 'FormValidate.php';
//create validator
$v = new Lib\FormValidate();
//add field(s) - params are field name, an optional alias, an optional list of rules
//with the "|" separator.
$v->add_field('name_field','Name','required|alpha');
//add more fields as required...
//the data to validate - any array of key=>value pairs
//(this example will fail)
$data = array('name_field' => '0123');
//run validation and do something with the results
if($v->run($data))
{
//passed validation - do stuff
echo "Pass!<br />";
}
else
{
//failed validation - do other stuff
$array_of_errors = $v->get_all_errors_array();
//....or per-field with default html tags (returns empty string if no error)
echo $v->get_error_message('name_field');
}An example of a custom rule defined as an anon callback looks like:
$v->add_validation_rule('new_test', function($obj,$str){
$obj->add_error_message('new_test',"The %s field must contain alpha characters only.");
return (bool) preg_match('#^[a-zA-Z]+$#',$str);
}); 
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