rtrim()

(PHP 4, PHP 5, PHP 7)

删除字符串末端的空白字符（或者其他字符）

说明

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：

• ""(ASCII32(0x20))，普通空白符。
• "t"(ASCII9(0x09))，制表符。
• "n"(ASCII10(0x0A))，换行符。
• "r"(ASCII13(0x0D))，回车符。
• "0"(ASCII0(0x00))，NUL空字节符。
• "x0B"(ASCII11(0x0B))，垂直制表符。

参数

输入字符串。

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 #1rtrim()使用范例

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"

参见

• trim()去除字符串首尾处的空白字符（或者其他字符）
• ltrim()删除字符串开头的空白字符（或其他字符）

I have an obsessive love for php's array functions given how extremely easy they've made complex string handling for me in various situations... so, have another string-rtrim() variant:

Astonishingly, something I didn't expect, but: It completely compares to harmor's rstrtrim below, execution time wise. o_o Whee!

True, the Perl chomp() will only trim newline characters. There is, however, the Perl chop() function which is pretty much identical to the PHP rtrim()
---
Here's a quick way to recursively trim every element of an array, useful after the file() function :

This shows how rtrim works when using the optional charlist parameter:
rtrim reads a character, one at a time, from the optional charlist parameter and compares it to the end of the str string. If the characters match, it trims it off and starts over again, looking at the "new" last character in the str string and compares it to the first character in the charlist again. If the characters do not match, it moves to the next character in the charlist parameter comparing once again. It continues until the charlist parameter has been completely processed, one at a time, and the str string no longer contains any matches. The newly "rtrimmed" string is returned.

On the recurring subject of string-stripping instead of character-stripping rtrim() implementations... the simplest (with a caveat) is probably the basename() function. It has a second parameter that functions as a right-trim using whole strings:

...outputs 'Moo'.
Since it also strips anything that looks like a directory, it's not quite identical with hacking a string off the end:

...still outputs 'Moo'.
But sometimes it gets the job done.

I needed a way to trim all white space and then a few chosen strings from the end of a string. So I wrote this class to reuse when stuff needs to be trimmed. 

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