Using WordPress ‘ext2type’ PHP filter

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The ext2type WordPress PHP filter allows you to modify the file type based on the extension name.

Usage

add_filter('ext2type', 'your_custom_function');
function your_custom_function($ext2type) {
    // your custom code here
    return $ext2type;
}

Parameters

  • $ext2type (array): Multi-dimensional array of file extensions types keyed by the type of file.

More information

See WordPress Developer Resources: ext2type

Examples

Add a new file type

Add a new file type for .xyz files as ‘custom’ type:

add_filter('ext2type', 'add_xyz_file_type');
function add_xyz_file_type($ext2type) {
    $ext2type['custom'][] = 'xyz';
    return $ext2type;
}

Modify an existing file type

Change .zip files from ‘compressed’ type to ‘custom’ type:

add_filter('ext2type', 'change_zip_file_type');
function change_zip_file_type($ext2type) {
    $ext2type['custom'][] = 'zip';
    unset($ext2type['compressed']['zip']);
    return $ext2type;
}

Remove a file type

Remove the .mp3 file type from the ‘audio’ category:

add_filter('ext2type', 'remove_mp3_file_type');
function remove_mp3_file_type($ext2type) {
    unset($ext2type['audio']['mp3']);
    return $ext2type;
}

Combine multiple file types

Combine .jpg and .jpeg file types under the ‘image’ category:

add_filter('ext2type', 'combine_jpg_jpeg_file_types');
function combine_jpg_jpeg_file_types($ext2type) {
    $ext2type['image'][] = 'jpg';
    $ext2type['image'][] = 'jpeg';
    return $ext2type;
}

Modify multiple file types

Move .docx and .xlsx files from ‘document’ type to ‘custom’ type:

add_filter('ext2type', 'move_docx_xlsx_file_types');
function move_docx_xlsx_file_types($ext2type) {
    $ext2type['custom'][] = 'docx';
    $ext2type['custom'][] = 'xlsx';
    unset($ext2type['document']['docx']);
    unset($ext2type['document']['xlsx']);
    return $ext2type;
}