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<?php function cn_substr_utf8($str, $length, $start=0) { if(strlen($str) < $start+1) { return ''; } preg_match_all("/./su", $str, $ar); var_dump($ar); $str = ''; $tstr = ''; //为了兼容mysql教程4.1以下版本,与数据库教程varchar一致,这里使用按字节截取 for($i=0; isset($ar[0][$i]); $i++) { if(strlen($tstr) < $start) { $tstr .= $ar[0][$i]; } else { if(strlen($str) < $length + strlen($ar[0][$i]) ) { $str .= $ar[0][$i]; } else { break; } } } var_dump($tstr); return $str; } var_dump(); // $a = '测试这是一个测试'; $a = 'xxxxbbbbbnnn'; $b = cn_substr_utf8($a,5,0); var_dump($b); ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught ArgumentCountError: var_dump() expects at least 1 argument, 0 given in /in/s0R5W:35 Stack trace: #0 /in/s0R5W(35): var_dump() #1 {main} thrown in /in/s0R5W on line 35
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: var_dump() expects at least 1 parameter, 0 given in /in/s0R5W on line 35 array(1) { [0]=> array(12) { [0]=> string(1) "x" [1]=> string(1) "x" [2]=> string(1) "x" [3]=> string(1) "x" [4]=> string(1) "b" [5]=> string(1) "b" [6]=> string(1) "b" [7]=> string(1) "b" [8]=> string(1) "b" [9]=> string(1) "n" [10]=> string(1) "n" [11]=> string(1) "n" } } string(0) "" string(6) "xxxxbb"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Wrong parameter count for var_dump() in /in/s0R5W on line 35 array(1) { [0]=> array(12) { [0]=> string(1) "x" [1]=> string(1) "x" [2]=> string(1) "x" [3]=> string(1) "x" [4]=> string(1) "b" [5]=> string(1) "b" [6]=> string(1) "b" [7]=> string(1) "b" [8]=> string(1) "b" [9]=> string(1) "n" [10]=> string(1) "n" [11]=> string(1) "n" } } string(0) "" string(6) "xxxxbb"
preferences:
279 ms | 403 KiB | 460 Q