Php/docs/function.rtrim
来自菜鸟教程
rtrim
(PHP 4, PHP 5, PHP 7)
rtrim — 删除字符串末端的空白字符(或者其他字符)
说明
rtrim
( string $str
[, string $character_mask
] ) : string
该函数删除 str
末端的空白字符(或者其他字符)并返回。
不使用第二个参数,rtrim() 仅删除以下字符:
- " " (ASCII
32
(0x20
)),普通空白符。 - "\t" (ASCII
9
(0x09
)),制表符。 - "\n" (ASCII
10
(0x0A
)),换行符。 - "\r" (ASCII
13
(0x0D
)),回车符。 - "\0" (ASCII
0
(0x00
)),NUL
空字节符。 - "\x0B" (ASCII
11
(0x0B
)),垂直制表符。
参数
str
- 输入字符串。
character_mask
- 通过指定
character_mask
,可以指定想要删除的字符列表。简单地列出你想要删除的全部字符。使用..
格式,可以指定一个范围。
返回值
返回改变后的字符串。
范例
Example #1 rtrim() 使用范例
<?php$text = "\t\tThese are a few words :) ... ";$binary = "\x09Example string\x0A";$hello = "Hello World";var_dump($text, $binary, $hello);print "\n";$trimmed = rtrim($text);var_dump($trimmed);$trimmed = rtrim($text, " \t.");var_dump($trimmed);$trimmed = rtrim($hello, "Hdle");var_dump($trimmed);// 删除 $binary 末端的 ASCII 码控制字符// (包括 0 - 31)$clean = rtrim($binary, "\x00..\x1F");var_dump($clean);?>
以上例程会输出:
string(32) " These are a few words :) ... " string(16) " Example string " string(11) "Hello World" string(30) " These are a few words :) ..." string(26) " These are a few words :)" string(9) "Hello Wor" string(15) " Example string"