Extracting only a-z and 0-9 from a string

[graziano]

Hello,

sorry , probably it was asked a lot of times , but I cannot find on the forum the solution .

I have this problem , from a string for example like this ....

$test ="é c_ -ñ[3)l£ô{n@çs!T} r(9îò";

which contains spaces and other caracthers I wish to extract only letters (a-z A-Z) and numbers (0-9) to have following string ;

$test ="c3lnsTr9";

Any idea to do that ? Thanks a lot !
Graziano

[laserlight]

I think you can use this function:

function extractAlphanum($str) {
	//set locale to default C chars
	setlocale(LC_CTYPE, 'C');
	$ret = ''; //string to be returned
	$len = strlen($str);
	for ($i = 0; $i < $len; $i++):
		//check if char is alphanumeric
		if (ctype_alnum($str{$i})):
			$ret .= $str{$i};
		endif;
	endfor;
	return $ret;
}

then maybe something like:

$test = "é c_ -ñ[3)l£ô{n@çs!T} r(9îò";
$test = extractAlphanum($test);

EDIT:
oops, I forgot that individual characters in a PHP string are accessed with braces, not brackets, though brackets still work.

[Weedpacket]

$extracted_text = preg_replace("[^a-zA-Z0-9]", "", $text);

[graziano]

Thanks a lot !,

laserlight script works really fine ,just to say Weedpacket
suggestion returns an empty string

$test = "é c_ -ñ[3)l£ô{n@çs!T} r(9îò"; 
$extracted_text = preg_replace("[^a-zA-Z0-9]", "", $test);
echo "<br>$extracted_text";

$extracted_text returns "" .

[cgraz]

try this:

$test ="é c_ -ñ[3)l£ô{n@çs!T} r(9îò"; 
echo preg_replace("/[^a-zA-Z0-9]/", "", $test);

Cgraz

[graziano]

Originally posted by cgraz
try this:

$test ="é c_ -ñ[3)l£ô{n@çs!T} r(9îò"; 
echo preg_replace("/[^a-zA-Z0-9]/", "", $test);

Cgraz [/B]

Thank you , it works fine too !.