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What does trim in php mean?

Dec 31, 2021 am 10:47 AM
php trim

php的trim是一种内置函数,用来去除字符串首尾处的空白字符或者其他字符,一般用在服务端对接收的用户数据进行处理,以免把用户误输入的空格存储到数据库。

What does trim in php mean?

本文操作环境:windows7系统、PHP7.1版、DELL G3电脑

php的trim是什么意思?

PHP trim()函数的作用和使用方法

PHP trim()函数一般是用来去除字符串首尾处的空白字符(或者其他字符),一般在用在服务端对接收的用户数据进行处理,以免把用户误输入的空格存储到数据库,下次对比数据时候出错。

该函数有两个参数,第二个可以为空,格式如下:

trim ( string $str [, string $character_mask = ” \t\n\r\0\x0B” ] );
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$str 为需要处理的字符串,如果$character_mask不为空,只会清楚$character_mask上写的要求清楚的字符;如果第二个参数$character_mask为空,会过滤以下字符:

” ” (ASCII 32 (0x20)),普通空格符。

“\t” (ASCII 9 (0x09)),制表符。

“\n” (ASCII 10 (0x0A)),换行符。

“\r” (ASCII 13 (0x0D)),回车符。

“\0” (ASCII 0 (0x00)),空字节符。

“\x0B” (ASCII 11 (0x0B)),垂直制表符。

数据处理后,返回的是过滤后的字符串。

设置一个参数$str:

<?php
$data = "我有空格 ";
$data2 = ";";
echo $data.$data2;
echo "<br>";
echo trim($data).$data2;
echo "<br>";
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很显然,trim函数处理后,字符串data的空格被去掉了。

我们加设置第二个参数看下效果:

<?php
$data = "我有空格 ";
$data2 = ";";
echo $data.$data2;
echo "<br>";
echo trim($data,&#39;\t&#39;).$data2;//指定删除制表符号\t
echo "<br>";
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很显然,我们的data没有制表符,所以即便trim处理过了,我们的空格还是存在。

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