trim · PHP学习

**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 | 选。规定要转换的字符串。| * "\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> ~~~