[WordPress] More on Working with CSV Files in WordPress

00-is-valid-mime-type.php

<?php

private function is_valid_mime_type( $file ) {

	$mime_types = array(
		'application/vnd.ms-excel',
		'text/plain',
		'text/csv',
		'text/tsv',
	);

	return in_array( mime_content_type( $file ), $mime_types );
}

01-is-valid-extension.php

<?php

private function is_valid_extension( $file ) {
	return ( 'csv' === pathinfo( $file, PATHINFO_EXTENSION ) );
}

02-approves.php

<?php

public function approves( $file ) {
	return
		$this->is_valid_extension( $file ) && $this->is_valid_mime_type( $file );
}

04-validator.php

<?php
namespace Acme\Utility\CSV;

class Validator {
  
	public function approves( $file ) {
		return
			$this->is_valid_extension( $file ) && $this->is_valid_mime_type( $file );
	}

	private function is_valid_mime_type( $file ) {

		$mime_types = array(
			'application/vnd.ms-excel',
			'text/plain',
			'text/csv',
			'text/tsv',
		);

		return in_array( mime_content_type( $file ), $mime_types );
	}

	private function is_valid_extension( $file ) {
		return ( 'csv' === pathinfo( $file, PATHINFO_EXTENSION ) );
	}
}