Php code for validating phone number
If it has not been submitted, skip the validation and display a blank form.
However, in the example above, all input fields are optional.
The HTML form we will be working at in these chapters, contains various input fields: required and optional text fields, radio buttons, and a submit button: The validation rules for the form above are as follows: This code adds a script tag and an alert command.
And when the page loads, the Java Script code will be executed (the user will see an alert box).
This does mean that this project may not follow Semantic Versioning, but instead Google's version policy.
As a result, jumps in major versions may not actually contain any backwards incompatible changes. Google try to release their versions according to Semantic Versioning, as laid out of in their Versioning Guide.
Proper validation of form data is important to protect your form from hackers and spammers!
This library will try to follow the same version numbers as Google.
There could be additional releases where needed to fix critical issues that can not wait until the next release from Google.
We will also do two more things when the user submits the form: The next step is to create a function that will do all the checking for us (which is much more convenient than writing the same code over and over again). Now, we can check each $_POST variable with the test_input() function, and the script looks like this: Notice that at the start of the script, we check whether the form has been submitted using $_SERVER["REQUEST_METHOD"].
If the REQUEST_METHOD is POST, then the form has been submitted - and it should be validated.