How to I remove special characters and spaces on a textfield using PHP

I need to remove all special characters and spaces 开发者_如何学运维on a textfield for a form I'm building. How do I accomplish this in PHP.

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This really depends, I assume you are working with $_POST[] data and wish to sanitize those inputs? If so I would definitely do something like:

$var = preg_replace("/[^A-Za-z0-9]/", "", $var);

That will strip out everything other than alpha/num, you can adjust the regex to include other characters if you wish. Some great examples of commonly used regular expressions can be found at: The RegEx Library

If this isn't quite what you are looking for or have other questions let us know.

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Use the following regex during processing of the data:

$data = preg_replace('/[^A-Za-z0-9]/', "", $data);

This will remove all non-alphanumeric characters from the data.

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$specialChars = array(" ", "\r", "\n");
$replaceChars = array("", "", "");

$str = str_replace($specialChars, $replaceChars, $str);