PHP rtrim() 函数
PHP 教程
· 2019-01-29 20:28:23
实例
移除字符串右侧的字符:
<?php
$str = "Hello World!";
echo $str . "<br>";
echo rtrim($str,"World!");
?>
$str = "Hello World!";
echo $str . "<br>";
echo rtrim($str,"World!");
?>
定义和用法
rtrim() 函数移除字符串右侧的空白字符或其他预定义字符。
相关函数:
- ltrim() - 移除字符串左侧的空白字符或其他预定义字符。
- trim() - 移除字符串右侧的空白字符或其他预定义字符。
语法
rtrim(string,charlist)
| 参数 | 描述 |
|---|---|
| string | 必需。规定要检查的字符串。 |
| charlist | 可选。规定从字符串中删除哪些字符。如果省略该参数,则移除下列所有字符:
|
技术细节
| 返回值: | 返回已修改的字符串。 |
|---|---|
| PHP 版本: | 4+ |
| 更新日志: | 在 PHP 4.1 中,新增了 charlist 参数。 |
更多实例
实例 1
移除字符串右侧的空格:
<?php
$str = "Hello World! ";
echo "Without rtrim: " . $str;
echo "<br>";
echo "With rtrim: " . rtrim($str);
?>
$str = "Hello World! ";
echo "Without rtrim: " . $str;
echo "<br>";
echo "With rtrim: " . rtrim($str);
?>
上面代码的 HTML 输出如下(查看源代码):
<!DOCTYPE html>
<html>
<body>
Without rtrim: Hello World! <br>With rtrim: Hello World!
</body>
</html>
<html>
<body>
Without rtrim: Hello World! <br>With rtrim: Hello World!
</body>
</html>
上面代码的浏览器输出如下:
Without rtrim: Hello World!
With rtrim: Hello World!
With rtrim: Hello World!
实例 2
移除字符串右侧的换行符(\n):
<?php
$str = "Hello World!nnn";
echo "Without rtrim: " . $str;
echo "<br>";
echo "With rtrim: " . rtrim($str);
?>
$str = "Hello World!nnn";
echo "Without rtrim: " . $str;
echo "<br>";
echo "With rtrim: " . rtrim($str);
?>
上面代码的 HTML 输出如下(查看源代码):
<!DOCTYPE html>
<html>
<body>
Without rtrim: Hello World!
<br>With rtrim: Hello World!
</body>
</html>
<html>
<body>
Without rtrim: Hello World!
<br>With rtrim: Hello World!
</body>
</html>
上面代码的浏览器输出如下:
Without rtrim: Hello World!
With rtrim: Hello World!
With rtrim: Hello World!
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