- var_dump: documentation ( source)
- sys_get_temp_dir: documentation ( source)
- mime_content_type: documentation ( source)
- file_put_contents: documentation ( source)
<?php
$path = sys_get_temp_dir() . '/test.tmp';
file_put_contents("abcd", $path);
var_dump(mime_content_type($path) === 'text/plain');
file_put_contents("abc", $path);
var_dump(mime_content_type($path) === 'text/plain');