Replacing Spaces with Underscores

I have a PHP Script that users will enter a name like: Alex_Newton,

However, some users开发者_开发百科 will use a space rather than an underscore, so my question is:

How do I auto-replace spaces with Underscores in PHP?

---

$name = str_replace(' ', '_', $name);

---

As of others have explained how to do it using str_replace, you can also use regex to achieve this.

$name = preg_replace('/\s+/', '_', $name);

---

$name = str_replace(' ', '_', $name);

http://php.net/manual/en/function.str-replace.php

---

Use str_replace function of PHP.

Something like:

$str = str_replace(' ', '_', $str);

---

Call http://php.net/str_replace: $input = str_replace(' ', '_', $input);

---

Use str_replace:

str_replace(" ","_","Alex Newton");

---

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.

$trimmed = trim($string); // Trims both ends
$convert = str_replace('', '_', $trimmed);

---

Strtr replaces single characters instead of strings, so it's a good solution for this example. Supposedly strtr is faster than str_replace (but for this use case they're both immeasurably fast).

echo strtr('Alex Newton',' ','_');
//outputs: Alex_Newton

---

I used like this

$option = trim($option);
$option = str_replace(' ', '_', $option);

---

str_replace - it is evident solution. But sometimes you need to know what exactly the spaces there are. I have a problem with spaces from csv file.

There were two chars but one of them was 0160 (0x0A0) and other was invisible (0x0C2)

my final solution:

$str = preg_replace('/\xC2\xA0+/', '', $str);

I found the invisible symbol from HEX viewer from mc (midnight viewer - F3 - F9)