This tutorial will show you some validations we require in most of the cases. These are given below one by one. 1. Check if an email address is injected //validate against any email injection attempts function is_email_injected($email) { $injections = array(‘(\n+)’, ‘(\r+)’, ‘(\t+)’, ‘(%0A+)’, ‘(%0D+)’, ‘(%08+)’, ‘(%09+)’ ); $inject = join(‘|’, $injections); $inject = “/$inject/i”; […]
Verify a string contains only integer value in PHP
This is an example on how to verify a string only contains integer values. String may contain anything like float value, double value, characters etc. This example uses regular expression to check a string contains only int values. Below is the function which validates a string contains only int values.
Allow only numeric values or digits in a TextBox using JavaScript or jQuery
Introduction The example – allow only numeric values or digits in a textbox using javascript or jquery – shows how to accept only numbers or digits in a textbox or input field using JavaScript or jQuery. Sometimes we need to accept only numbers for a textbox or input field instead of validating the value in […]
File validation example in PHP
This tutorial shows how to allow only specific file types to be uploaded to the server. In this example I have shown how to allow only Microsoft word document and pdf file types. You can add more file types here. We need to validate the file type for whenever we allow user to upload a […]
Email address validation example in PHP
This is an example how to validate email address in PHP. We need to validate email address in most of the applications now a days because in every application we need to have email sending functionality for various reasons like username reset, password reset, email reset etc. Below function checks how to validate the email […]
Custom validation example in Codeigniter
Introduction This tutorial shows how to work with custom validation in Codeigniter. We need many times that a field has to be validated against some type of values but built-in features do not provide all kind of validation pattern, so we need to write a function which will be used as callback function for a […]
Custom regex function to replace characters in MySQL
This tutorial shows how to replace the characters in a string or text using regular expression in MySQL function. There is no built-in function available to replace any character in a string or text in MySQL so here I am creating a custom function.