PHP filter_input () function

Definition and usage

The filter_input () function obtains and filters the input from outside the script.

This function is used to verify variables from unsafe sources, such as user input.

This function can obtain input from various sources:

• Input_get
• Input_post
• Input_cookie
• Input_env
• Input_server
• Input_session (not yet implemented)
• Input_request (not yet implemented)

If the operation succeeds, the filtered data is returned. If the operation fails, false is returned.VariableIf the parameter is not set, null is returned.

Syntax

 
Filter_input (input_type, variable, filter, options)
 

Parameters	Description
Input_type	Required. Specifies the input type. See the possible types in the list above.
Variable	Specifies the variable to be filtered.
Filter	Optional. Specifies the ID of the filter to be used. The default value is filter_sanitize_string. See the complete PHP filter function reference manual to obtain possible filters. The filter ID can be an ID name (such as filter_validate_email) or an ID (such as 274 ).
Options	Specifies an array containing flag/option. Check the possible flags and options of each filter.

Example

In this example, we use the filter_input () function to filter a post variable. The accepted post variable is a valid email address.

 
<? Phpif (!Filter_input (input_post, 'email ', filter_validate_email)) {Echo "E-mail is not valid";} else {echo "E-mail is valid" ;}?>
 

The output is similar:

 
Email is valid