php filter_input filter function example tutorial_PHP tutorial

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Definition and usage
The filter_input() function gets the input to the filter from an external script and filters it.

This function is used to validate variable forms from unsafe sources, such as user input.

This feature can input several sources:

INPUT_GET
INPUT_POST
INPUT_COOKIE
INPUT_ENV
INPUT_SERVER
INPUT_SESSION (not implemented yet)
INPUT_REQUEST (not yet implemented)
Returns filtered data on success, false failure or NULL if the 'variable' parameter is not set.

Grammar

filter_input(input_type, variable, filter, options)

		Parameter

看看实例.

For example, in this example we use the filter_input () function to filter the variables. The received variable is a valid e-mail address:

<!--?phpif (!filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL)) { echo "E-Mail is not valid"; }else { echo "E-Mail is valid"; }?-->

输出为.

E-Mail is valid