Filter
PHP Manual

filter_var

(PHP 5 >= 5.2.0, PECL filter:0.11.0)

filter_var — Filters a variable with a specified filter

说明

mixed filter_var ( mixed $variable [, int $filter [, mixed $options ]] )

参数

variable

Value to filter.

filter

ID of a filter to use. Defaults to FILTER_SANITIZE_STRING.

options

Associative array of options or bitwise disjunction of flags. If filter accepts options, flags can be provided in "flags" field of array. For the "callback" filter, callback type should be passed.

返回值

Returns the filtered data, or FALSE if the filter fails.

范例

Example#1 A filter_var() example

<?php
var_dump(filter_var('[email protected]', FILTER_VALIDATE_EMAIL));
var_dump(filter_var('example.com', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED));
?>

上例将输出：

string(15) "[email protected]"
bool(false)

参见

Filter
PHP Manual