Code for validating email in php
However, when the user selects the XML document catalog1.xml, validation fails for the book element in the lines containing more than one title element.
When the program encounters the invalid node, the method Validation Error is called that displays a message explaining why validation failed. An object of the class Xml Schema Set stores a collection of schemas that an Xml Reader can be validated against.
Create and set the properties of an Xml Reader Settings object.
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If not, you may get the error messages from the yii\base\Model::$errors property.
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As a rule of thumb, you should never trust the data received from end users and should always validate it before putting it to good use.
The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.
It can validate an XML document as it reads and parses the document.
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In this example, we demonstrate how to activate such validation.