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filter_input

(no version information, might be only in CVS)

filter_input -- Gets variable from outside PHP and optionally filters it

说明

mixed filter_input ( int type, string variable_name [, int filter [, mixed options]] )

参数

type

One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, INPUT_ENV, INPUT_SESSION (not implemented yet) and INPUT_REQUEST (not implemented yet).

variable_name

Name of a variable to get.

filter

Filter to apply. Defaults to FILTER_DEFAULT.

options

Associative array of options or bitwise disjunction of flags. If filter accepts options, flags can be provided in "flags" field of array.

返回值

Value of the requested variable on success, FALSE if the filter fails, or NULL if the variable_name variable is not set. If the flag FILTER_NULL_ON_FAILURE is used, it returns FALSE if the variable is not set and NULL if the filter fails.

范例

例 1. A filter_input() example

<?php
$search_html = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_SPECIAL_CHARS);
$search_url = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_ENCODED);
echo "You have searched for $search_html.\n";
echo "<a href='?search=$search_url'>Search again.</a>";
?>

上例的输出类似于：

You have searched for Me &#38; son.
<a href='?search=Me%20%26%20son'>Search again.</a>

参见

filter_var()
filter_input_array()
filter_var_array()

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