Regular expressions to remove space and whitespace in PHP?

Question

我正在寻找正则表达式以删除逗号前后的空格和空白。

Answer 1

Try this:

$output = preg_replace('/\s*,\s*/', ',', $str);

This will replace all commas with possible leading and trailing whitespace characters ( \\s ) by a single comma.

Answer 2

preg_replace('/\s*,\s*/', ',', $target_string);

Answer 3

You don't need regex for this.

$output = explode(',', $input);
$output = array_map('trim', $output);
$output = implode(',', $output);