Strip all but certain characters from a string in PHP (such as alphanumeric, numeric, etc…)

The #1 result in Google for stripping characters out of strings in PHP is awful and uses the deprecated ereg_replace function so lets make a new search result using preg_replace which is much better, faster and it is fully supported in PHP 5 and 7. Allow only alpha-numeric: $out = preg_replace(‘|[^A-Za-z0-9]|’, ”, $in); Only numeric: […]

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