php去空格函数trim的定义和用法。
trim() 函数从字符串的两端删除空白字符和其他预定义字符。
语法trim(string,charlist)string必需。规定要检查的字符串。
charlist 可选，规定要转换的字符串。如果省略该参数，则删除以下所有字符：
" " - null
"t" - tab
"n" - new line
"x0b" - 纵向列表符
"r" - 回车
" " - 普通空白字符
例子：
复制代码 代码示例:
<html><body><?php$str = " hello world! ";echo "without trim: " . $str;echo "<br />";echo "with trim: " . trim($str);?><body><html>
输出：
without trim: hello world!with trim: hello world!
html部分：
复制代码 代码示例:
<html><body>without trim: hello world! <br />with trim: hello world!</body></html>例子 2<?php$str = "rnhello world!rn";echo "without trim: " . $str;echo "<br />";echo "with trim: " . trim($str);?>
输出：
without trim: hello world!with trim: hello world!
例子：
复制代码 代码示例:
<html><body>without trim: hello world!<br />with trim: hello world!</body></html> 444<?php
//$c =
include "2.php";
//echo $c[0];
$str = " this is a string <br>kwga";
echo $str;
echo "<p>";
$newstr = trim($str,"t,g,r,t, ,");
echo $newstr;
?>
