Form & component validation using PHPForms are mainly used to collect user entered data to the system. We enter our login data or use one signup form to enter data as a user to a database table or to a form processing script. There are different components like text box, radio buttons, checkbox, combo box or drop down list boxes for users to enter data to a system. You can read more details on web form and its components in our HTML section.To handle various display and design issues we have to use front end tool like HTML or JavaScript. Our server side script PHP is used to handle the data as entered by users. We also need PHP to validate the data and post back the error messages if validation fails. We will discuss some basic issues relating to handling of form components and some sample codes here. Check Box
Checkbox How to use and handle checkbox data.
Checkbox data How to handle the post back data for a check box if validation fails? Checkbox & database Retrieving and storing data of checkbox Validation and Checks of user entered data
How to retain form data Retaining the data in the form if it fails to submit
Data Validation and posting back Validating all form components and posting back Date validation Validating user entered date value. Email Validation Checking format of user entered email address Email Validation using Ajax Using Ajax to validate email address validate form Php code to validate data after posting by user Checking for number only Returns falls if data is not a number is_int Checks if data is an integer or not alphanumeric characters Characters A to Z and numbers are only allowed. Only alphabets Checking for Alphabets only Drop down list box in a form
Drop down listbox Retaining user selection of a drop down list box
Multiple selection Handling multiple selection of drop down list box Basics of Form in PHPHow to collect the data from a simple html form and display all the variables of the form.Text BoxText box is the most commonly used form component. How to use text boxes and how to retain data if form validation fails? .Period button post back data holdingRadio buttons ( or period ) are used when user has to select one of the many options. Once the validation of form fails then how to retain the selected value of the user in the set of period buttons?Register_global settingHow to handle data if register_global is set to OFF at php.ini file. In PHP5 and above register_global is by default set to OFF
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▼ Web Forms & handling data in PHP
 Web form and how to handle the data posted by users in PHPSample codes to check data entered through Web formsAll form components validation with post back and data lockingCheckboxHow to retain form data if validation fails?How to retain data of a text box after submittingRetaining status of a check boxUpdating checkbox value from & to a table record. Retaining selected data of a period button of a formRetaining selected data of a drop down list box of a formHandling drop down list box with multiple selection options using arrayValidating Date: Checking if date existEmail address validation in a formEmail validation using Ajax & PHPPHP Form Validationis_numeric to check numeric numbersis_int to check integerctype_alnum to check alphanumeric characters datactype_alpha to check alphabetic characters dataHow to take care of form & query string variables if Register global is OFF?
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