1--TEST-- 2Test mb_strstr() function : with empty needle 3--EXTENSIONS-- 4mbstring 5--FILE-- 6<?php 7 8mb_internal_encoding('UTF-8'); 9 10$string_ascii = 'abc def'; 11// Japanese string in UTF-8 12$string_mb = "日本語テキストです。0123456789。"; 13 14echo "\n-- ASCII string --\n"; 15var_dump(mb_strstr($string_ascii, '', false, 'ISO-8859-1')); 16var_dump(mb_strstr($string_ascii, '')); 17var_dump(mb_strstr($string_ascii, '', true)); 18 19echo "\n-- Multibyte string --\n"; 20var_dump(mb_strstr($string_mb, '')); 21var_dump(mb_strstr($string_mb, '', false, 'utf-8')); 22var_dump(mb_strstr($string_mb, '', true)); 23 24?> 25--EXPECT-- 26-- ASCII string -- 27string(7) "abc def" 28string(7) "abc def" 29string(0) "" 30 31-- Multibyte string -- 32string(53) "日本語テキストです。0123456789。" 33string(53) "日本語テキストです。0123456789。" 34string(0) "" 35