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How to delete the last character of a string in php

藏色散人

Aug 17, 2020 am 09:44 AM

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php删除字符串最后一个字符的方法：1、使用rtrim函数删除字符串末端的空白字符；2、通过substr函数返回字符串的子串，并实现删除最后一个字符即可。

How to delete the last character of a string in php

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PHP删除字符串最后一个字符

通常在存多个有效值的时候（如：关键字，标签等），需要对存储的值进行分隔符处理，这样处理后通常会在字符串的首端或末端多一个分隔符，这是就需要对字符串进行处理删除首端或末端的分隔符。

方法一：

rtrim — 删除字符串末端的空白字符（或者其他字符）
说明： string rtrim ( string $str [, string $character_mask ] )

该函数删除 str 末端的空白字符并返回。

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。

$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。

例子:

$text = &#39;b,c,d,&#39;;
$trimmed  =  rtrim ( $text ,  "," );
 var_dump ( $trimmed );

输出 b,c,d

类似函数：

ltrim() 去除字符串首尾处的空白字符（或者其他字符）

trim() 去除字符串首尾处的空白字符（或者其他字符）

方法二：

substr — 返回字符串的子串
string substr ( string $string , int $start [, int $length ] )
$string 要处理的字符串  
$start 开始的位置

如果 start 是非负数，返回的字符串将从 string 的 start 位置开始，从 0 开始计算。例如，在字符串 “abcdef” 中，在位置 0 的字符是 “a”，位置 2 的字符串是 “c” 等等。

如果 start 是负数，返回的字符串将从 string 结尾处向前数第 start 个字符开始。

如果 string 的长度小于或等于 start，将返回 FALSE 。

$length 截取的字符串长度如果没有提供 length，返回的子字符串将从 start 位置开始直到字符串结尾。

$str = &#39;a,b,c,d,&#39;;
$rest  = substr(  $str,0,strlen($str)-1);
echo $rest;   
输出： a,b,c

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