php 用下划线替换空格
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Replacing Spaces with Underscores
提问by alex
I have a PHP Script that users will enter a name like: Alex_Newton,
我有一个PHP脚本，用户将输入一个名称，如：Alex_Newton，
However, some users will use a space rather than an underscore, so my question is:
但是，有些用户会使用空格而不是下划线，所以我的问题是：
How do I auto-replace spaces with Underscores in PHP?
如何在 PHP 中用下划线自动替换空格？
回答by Tim Fountain
$name = str_replace(' ', '_', $name);
回答by aksu
As of others have explained how to do it using str_replace, you can also use regex to achieve this.
由于其他人已经解释了如何使用str_replace，您也可以使用正则表达式来实现这一点。
$name = preg_replace('/\s+/', '_', $name);
回答by Viktor
$name = str_replace(' ', '_', $name);
回答by anubhava
Use str_replacefunction of PHP.
使用PHP 的str_replace函数。
Something like:
就像是：
$str = str_replace(' ', '_', $str);
回答by webspy
Call http://php.net/str_replace: $input = str_replace(' ', '_', $input);
调用http://php.net/str_replace：$input = str_replace(' ', '_', $input);
回答by Niklas
回答by blakroku
You can also do this to prevent the words from beginning or ending with underscores like _words_more_words_, This would avoid beginning and ending with white spaces.
您也可以这样做以防止单词以下划线开头或结尾，例如 _words_more_words_，这将避免以空格开头和结尾。
$trimmed = trim($string); // Trims both ends
$convert = str_replace('', '_', $trimmed);
回答by Fil
I used like this
我是这样用的
$option = trim($option);
$option = str_replace(' ', '_', $option);
回答by jmmaguigad
This is part of my code which makes spaces into underscores for naming my files:
这是我的代码的一部分，它使空格变成下划线以命名我的文件：
$file = basename($_FILES['upload']['name']);
$file = str_replace(' ','_',$file);
回答by Thoracius Appotite
Strtrreplaces single characters instead of strings, so it's a good solution for this example. Supposedly strtris faster than str_replace(but for this use case they're both immeasurably fast).
Strtr替换单个字符而不是字符串，因此这是本示例的一个很好的解决方案。据说strtr比str_replace（但对于这个用例，它们都快得无法估量）。
echo strtr('Alex Newton',' ','_');
//outputs: Alex_Newton
