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What is the php function to remove spaces?

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Nov 04, 2020 am 10:15 AM

phpRemove spaces

php删除空格函数是：1、ltrim函数，实现删除字符串开始位置的空格或其他字符；2、rtrim函数，实现删除字符串结束位置的空格或者其他字符；3、trim函数，实现删除字符串开始和结束位置的空格或者其他字符。

What is the php function to remove spaces?

php删除空格函数是：

1、ltrim函数

描述：实现删除字符串开始位置的空格或其他字符

语法：string ltrim(string $str [,string $charlist])

说明：charlist规定从字符串中删除哪些字符。如果缺省该参数，则移除下列所有字符

What is the php function to remove spaces?

$str = "\\n\\n\\t\\tABC\\t\\t";
echo ltrim($str);
//输出后,ABC前面的空白就没有了

如果我只想删除制表符，而不想删除换行，那么我们加参数↓

$str = "\\n\\n\\t\\tABC\\t\\t";
echo ltrim($str,"\\t");

2、rtrim函数

描述：实现删除字符串结束位置的空格或者其他字符

语法：string rtrim(string $str[,string $charlist])

3、trim函数

描述：实现删除字符串开始和结束位置的空格或者其他字符

语法：string trim(string $str[,string $charlist])

实例应用

<?php
$str = &#39;Demon is an English teacher.17847564092&#39;;
$str = rtrim($str,&#39;0..9&#39;);
echo $str;
//删除末尾多余的数字

疑问:这里为什么不用trim或者ltrim

猜想:从右侧开始遍历，如果遇到不符合参数条件的，函数停止执行。我们如果从左边开始，那么先碰到的是英文字母，不符合参数。

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