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PHP filter_id () function

PHP Filter Reference Complete PHP Filter Reference

Definition and Usage

filter_id () function returns the filter ID.

If successful, the filter ID number is returned if the filter does not exist returns NULL.

grammar

filter_id(filter_name)

参数 描述
filter_name 必需。规定被获取 ID 号的过滤器。

必须是过滤器名称(不是过滤器 ID 名)。请使用 filter_list() 函数来获取所有被支持的过滤器的名称。


Examples

<?php
echo(filter_id("validate_email"));
?>

Output code is as follows:

274


PHP Filter Reference Complete PHP Filter Reference