PHP Detect if non-english [duplicate]

Question

I am using these code to check if a string is in English or not.

<?php
    $string="で書くタッチイベント (フ";

    if(!preg_match('/[^\W_ ] /',$string)) {
        echo "Please enter English words only:(";
    } else {
        echo "OK, English Detected!";
    }
?>

It cant provide perfect result because string like "some english text で書くタッチイベント (フ" this also detects as English language, any idea?

Answer 1

Try this (please note you need mbstring php module installed):

<?php
    $string="で書くタッチイベント (フ";

    if(strlen($string) != mb_strlen($string, 'utf-8'))
    { 
        echo "Please enter English words only:(";
    }
    else {
        echo "OK, English Detected!";
    }
?>