How to build a function (PHP) which replaces....

everything about: 0-9, a-z, A-Z, _
replaces on '' (deletes)
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I don't understand the question exactly...

You want a function that takes a string and deletes those characters?

Can you show a string to pass to the "function" and what the desired output would be ?

function myDelete($text)
	return preg_replace($pattern, "", $text);

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To replace everything that ISN'T alphanumeric and/or "_" you can use this:

$new_string = preg_replace(/[^a-zA-Z0-9_\s]/, , $string);

Like in this example:

$string = Here! is some text, and numbers 12345, and symbols !£$%^&;
$new_string = preg_replace(/[^a-zA-Z0-9_\s]/, , $string);
echo $new_string; // It shows: Here is some text and numbers 12345 and symbols

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And to test it:
echo myDelete("123 abdx **&&++__");

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