Detect Encoding Php -

For serious work, mb_detect_encoding has limitations. Consider or symfony/polyfill-intl-normalizer , but the gold standard is Mozilla’s universalchardet (ported to PHP as jaybizzle/crawler-detect or similar, or use the mbstring strict mode).

return $detected ?: 'UTF-8';

$text = "Hello"; // Pure ASCII echo mb_detect_encoding($text); // ASCII (but it's also valid UTF-8, ISO-8859-1, etc.)

// Better: read content and detect $content = file_get_contents('file.txt'); echo mb_detect_encoding($content); detect encoding php

If your default order is UTF-8, ISO-8859-1 :

<?php function is_utf8($str) return preg_match('//u', $str);

mb_detect_encoding doesn't know the encoding—it guesses. Consider this: For serious work, mb_detect_encoding has limitations

For production environments where you cannot afford to guess wrong (e.g., importing CSVs from unknown sources), native PHP functions are often insufficient.

A common scenario is that a string is already UTF-8, but it was inserted into a database column configured as Latin-1, resulting in "garbage" characters (e.g., é instead of é ).

Sometimes, you don't need to know what encoding it is; you just need to know if it is UTF-8. Consider this: For production environments where you cannot

$string = file_get_contents('legacy_data.txt'); $encodings = ['UTF-8', 'ISO-8859-1', 'Windows-1252']; $detected = mb_detect_encoding($string, $encodings);

echo $detected; // ISO-8859-1

$string = "Valid UTF-8 string: Ñ"; if (is_utf8($string)) // Logic here