filter_var Filters a variable with a specified filter


filter_var

(PHP 5 >= 5.2.0)

filter_varFilters a variable with a specified filter

说明

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

参数

variable

Value to filter.

filter

The ID of the filter to apply. The Types of filters manual page lists the available filters.

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. The callback must accept one argument, the value to be filtered, and return the value after filtering/sanitizing it.

<?php
// for filters that accept options, use this format
$options = array(
    
'options' => array(
        
'default' => 3// value to return if the filter fails
        // other options here
        
'min_range' => 0
    
),
    
'flags' => FILTER_FLAG_ALLOW_OCTAL,
);
$var filter_var('0755'FILTER_VALIDATE_INT$options);

// for filter that only accept flags, you can pass them directly
$var filter_var('oops'FILTER_VALIDATE_BOOLEANFILTER_NULL_ON_FAILURE);

// for filter that only accept flags, you can also pass as an array
$var filter_var('oops'FILTER_VALIDATE_BOOLEAN,
                  array(
'flags' => FILTER_NULL_ON_FAILURE));

// callback filter
function foo($value)
{
    
$ret = new stdClass;
    
$ret->value filter_var($valueFILTER_VALIDATE_BOOLEAN,
                             array(
'flags' => FILTER_NULL_ON_FAILURE));
    return 
$ret;
}
$var filter_var('yes'FILTER_CALLBACK, array('options' => 'foo'));
?>

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('http://example.com'FILTER_VALIDATE_URLFILTER_FLAG_PATH_REQUIRED));
?>

以上例程会输出:

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

参见


«  filter_list
» filter_var_array
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