How to get filter ID using filter_id() function in PHP? (code example)

The filter_id() function is a built-in function in PHP, which can return the filter ID number of the specified filter name. The following article will introduce to you how to use the filter_id() function in PHP to obtain the specified filter ID number. I hope it will be helpful to you.

PHP filter_id() function

The filter_id() function can return the filter with the specified filter name Device ID number. It is used to get the filter ID of a specific filter in PHP by using the filter_id function by taking the name of the filter as input and getting the ID associated with it.

Basic syntax

filter_id( $filtername )

Parameters: This filter_id() function accepts a single parameter $filtername, which is required; it contains the filter name .

Note: This function is available for PHP 5.2.0 and higher.

Code Example

The following is a code example to see how to use the filter_id() function to obtain the specified filter ID number.

Example 1:

<?php 
  
// 使用filter_id函数返回过滤器id
echo(filter_id("validate_email")); 
  
?>

Output:

274

Explanation: validate_email is the name of the filter here. flter_id("validate_email") returns 274 as the ID of the filter validate_email.

Example 2: Shows all available filter names and their corresponding filter IDs as represented in the filter_list() function.

<?php 
// 显示带有ID的过滤器列表
echo "<table border=&#39;1&#39; style=&#39;width:400px;border-collapse:collapse;&#39;>";
foreach (filter_list() as $id =>$filter) { 
    echo "<tr><td>" . $filter . "</td><td>"
        . filter_id($filter) . "</td>"; 
} 
echo "</table>";
?>

Output:

Description: The filter_list() function returns a list of filter names. Use the filter_id() function to extract the id of the filter name and output it as an HTML table component (just represented in a better way).

Recommended video tutorials: "PHP Tutorial"

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