PHP data validation of each field in form before going to next field
<p>i have an admission.php form and i want to validate the entered data in each text field before going to next field i-e pressing Tab button.If such type of data validation is possible in php (not in java script or other scripting language) then please tell me if anyone know.
But if this type of data validation is not possible in php then please tell me java script complete code for this. 
Note.
i ahve 5 fields in my form </p>

<ol>
<li>Name field should only contain alphabets (both capital and in lower case)</li>
<li>Validate the date of birth(select from small calender and that selected date will store in php variable)</li>
<li>Contact number field must contain digits only.</li>
<li>Email and 
in last</li>
<li>Address field that can have alphabtic and digits characters only.
And also all fields should allow white spaces too.
i konw this is a time consuming but please help me i am in trouble guys. please help.</li>
</ol>
