PHP trim() 函数
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)
参数 | 描述 |
---|---|
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: "\0 " - NULL "\t " - tab "\n " - new line "\x0B " - 纵向列表符 "\r " - 回车 " " - 普通空白字符 |
例子
例子 1
<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 源码:
<html>
<body>
Without trim: Hello World! <br />With trim: Hello World!
</body>
</html>
例子 2
<?php
$str = "\r\nHello World!\r\n";
echo "Without trim: " . $str;
echo "<br />";
echo "With trim: " . trim($str);
?>
输出:
Without trim: Hello World!
With trim: Hello World!
HTML 源码:
<html>
<body>
Without trim:
Hello World!
<br />With trim: Hello World!
</body>
</html>