PHP函数之trim

trim函数

1.功能:去除字符串首尾处的空白字符(或者其他字符)

2.函数原型: string trim(string $str[, string $charlist= "\t#n#r#0#x0B"])

   str:待处理的字符串

   charlist:可选参数,过滤字符也可由charlist参数指定. 一般要列出所有希望过滤的字符,也可以用".."列出一个字符范围

   返回值:过滤后的字符串

  此函数返回字符串str去除首尾iekongbai字符后的结果.如果不指定第二个参数,trim()将去除下面的字符:

   1>." ",普通的空格符

   2>."\t ",制表符

   3>." \n",换行符

   4>." \r",回车符

   5>." \0",空字节符

   6>." \x0B".垂直制表符

 3.例子:

  

  输出:
  string(32) "        These are a few words :) ...  "
  string(16) "    Example string
  "
  string(11) "Hello World"

  string(28) "These are a few words :) ..."
  string(24) "These are a few words :)"
  string(5) "o Wor"
  string(14) "Example string"