I used preg_match but its returning pdf as it English that's why may be.
But I want to get only 練馬春日町Ⅳ
Is there any way to detect it for mb string.
<?php
// Initialize a sentence to a variable
$sentence = '練馬春日町Ⅳ 清掃レポート.pdf';
// Use preg_match() function to get the
// first word of a string
preg_match('/\b\w+\b/i', $sentence, $result);
// Display result
echo "The first word of string is: ".$result[0];
?>
To make your code work you just need to add the u flag to the regex so that it matches unicode characters:
preg_match('/^\w+/iu', $sentence, $result);
echo "\nThe first word of string is: ".$result[0];
Output:
The first word of string is: 練馬春日町Ⅳ
Note that since you want the first word you can simply anchor your regex with ^ and the second \b is not required as \w+ will match as many word characters as it can i.e. until it gets to the first word break.
Alternatively you can use mb_split with a regex of \p{Z} which matches any unicode whitespace or invisible separator:
$sentence = '練馬春日町Ⅳ 清掃レポート.pdf';
$first_word = mb_split('\p{Z}', $sentence);
echo $first_word[0];
Output:
練馬春日町Ⅳ