请看下面一段代码: <?php $text="\t\tThese are a few words :)..."; $trimmed=trim($text); var_dump($trimmed); 其运行结果为()。 A. String(21)"These are a few words " B. String(32)"\t\tThese are a few words :) ..." C. String(28)"These are a few words :) ..." D. 以上都不对

答案是 C. String(28) "These are a few words :)...".

trim() 函数用于去除字符串两端的空格或其他预定义字符，返回处理后的字符串。在此例中，变量 $text 的值为 "\t\tThese are a few words :)..."，其中 \t 表示制表符。trim() 函数默认去除字符串开头和结尾的空格和制表符，因此 $trimmed 的值为 "These are a few words :)..."，长度为 28。

注意，trim() 函数并没有去除中间的空格和制表符。如果想去除整个字符串中的空格和制表符，可以使用 str_replace() 函数：

$text = "\t\tThese are a few words :)...";
$trimmed = str_replace(array("\t", " "), "", $text);
var_dump($trimmed); // 输出 string(21) "Theseareafewwords:)..."

相关问题

帮我把grovvy代码转成python代码 lines.each { line -> print "*********************"+line def trimmedString = line.trim() boolean containsData = trimmedString?.trim() if (containsData) { (type, compiler, test_suite, environment) = trimmedString.split() if (type == "ST:") { trimmedString = compiler + " " + test_suite + " " + environment // print("ST:" + trimmedString) StEnvList = StEnvList + [trimmedString] } else if (type == "UT:") { trimmedString = compiler + " " + test_suite + " " + environment // print("UT:" + trimmedString) UtEnvList = UtEnvList + [trimmedString] } else { trimmedString = compiler + " " + test_suite + " " + environment print("??:" + trimmedString) return } print ("++ " + trimmedString) EnvList = EnvList + [trimmedString] } }

我会尝试将 Groovy 代码转换为 Python 代码。以下是我所能做的转换：

for line in lines:
print("*********************" + line)
trimmedString = line.strip()
containsData = trimmedString.strip()
if containsData:
type, compiler, test_suite, environment = trimmedString.split()
if type == "ST:":
trimmedString = compiler + " " + test_suite + " " + environment
# print("ST:", trimmedString)
StEnvList[trimmedString]
elif type == "UT:":
trimmedString = compiler + " " + test_suite + " " + environment
# print("UT:", trimmedString)
UtEnvList[trimmedString]
else:
trimmedString = compiler + " " + test_suite + " " + environment
print("??:" + trimmedString)
return
print(" " + trimmedString)
EnvList[trimmedString]

QString username = ui->usernameLineEdit->text().trimmed(); QString password = ui->passwordLineEdit->text().trimmed();

这段代码看起来像是从一个Qt图形界面中获取用户名和密码的输入。`ui->usernameLineEdit->text().trimmed()`获取用户名输入框中的文本并去除首尾空格，`ui->passwordLineEdit->text().trimmed()`获取密码输入框中的文本并去除首尾空格。这些文本将被存储在`username`和`password`这两个QString类型的变量中，以便进行后续的处理和验证。