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How to remove first and last characters in PHP
- 藏色散人Original
- 2021-02-28 11:24:172563browse
PHP去掉头尾字符的方法：首先创建一个PHP示例文件；然后定义一个头尾含有特殊字符的字符串；最后通过trim函数去除首尾空格或者tab等字符。
本教程操作环境：windows7系统、PHP7.1版，DELL G3电脑
可用trim去除首尾空格及如下字符：
"\0" - NULL "\t" - tab "\n" - new line "\x0B" - 纵向列表符 "\r" - 回车
为了便于展示，我在打印输出时首尾分别加了"start"与"end"来观察是否存在空格。
字符串首尾两端的空格都被去除了。
如果只需去除首部空格可用ltrim，如果只需去除尾部空格可用rtrim。【推荐学习：《PHP视频教程》】
trim,ltrim与rtrim的结果分别如下。
trim函数还有第二个参数，如果设置了，表示是去除该参数中指定的字符，如下面设置为". "，表示去除"."与" "。
可以看到首部空格，尾部"."与空格均被去除了。
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