Clean Up File Names on Upload
Converts uploaded file names to lowercase, removes accents and replaces spaces and symbols with dashes, for tidy and portable URLs.
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Code
add_filter( 'sanitize_file_name', function ( $filename ) {
$info = pathinfo( $filename );
$extension = isset( $info['extension'] ) && '' !== $info['extension'] ? '.' . strtolower( $info['extension'] ) : '';
$name = isset( $info['filename'] ) ? $info['filename'] : $filename;
$name = remove_accents( $name );
$name = strtolower( preg_replace( '/[^A-Za-z0-9]+/', '-', $name ) );
$name = trim( $name, '-' );
return ( '' === $name ? 'file' : $name ) . $extension;
} );How to add this snippet
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