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('bob@example.com', FILTER_VALIDATE_EMAIL));
var_dump(filter_var('example.com', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED));
?>

上例将输出：

string(15) "bob@example.com"
bool(false)

参见

filter_var_array()
filter_input()
filter_input_array()
有关 callback 类型的信息


	PHP5中文手册 Filter Firebird/InterBase 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('bob@example.com', FILTER_VALIDATE_EMAIL)); var_dump(filter_var('example.com', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED)); ?>` 上例将输出： string(15) "bob@example.com" bool(false) 参见 filter_var_array() filter_input() filter_input_array() 有关 callback 类型的信息 Filter Firebird/InterBase Filter PHP Manual