PHP filter_id()Functions
Complete PHP Filter Reference Manual
Definition and Usage
The filter_id() function returns the ID number of the specified filter.
Returns the filter ID number if successful, or NULL if the filter does not exist.
Syntax
filter_id(filter_name)
| Parameter | Description |
|---|---|
| filter_name | Required. Specifies the filter whose ID number is to be retrieved. Must be the filter name (not the filter ID name). Use the filter_list()function to get the names of all supported filters. |
Examples
<?php
echo(filter_id("validate_email"));
?>
echo(filter_id("validate_email"));
?>
The output of the code is as follows:
274
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