Re: ereg_replace with user defined function?

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Thank you Ilaria and Roman for your input. I did not know that preg is able to deal with PCRE patterns. As a matter of fact I came up with the following solution (if someone is interested):

the function takes a text and an array with converters like:

$converters[] = array ( "metric" => "mm", "imperial" => "in", "ratio" => 0.039370079, "round" => 1 ); $converters[] = array ( "metric" => "m", "imperial" => "ft", "ratio" => 3.280839895, "round" => 1 );


function convertTextString ( $text, $convertTable )
{
# this function takes a text string, searches for numbers to convert, convert those numbers and returns
	# the complete text again.

if ( !ereg ( "[[:digit:]]", $text ) ) // if the text does not contain any numbers, return the text as it is
	{
		return $text;
	}
	
	foreach ( $convertTable as $convertKey => $convertUnit )
	{
$pattern = "((\d{1,10}[,|.]*\d{0,10})*(\s)(%s)([$|\s|.|,|\)|/]+| $))"; // this regex looks for a number followed by white space, followed by the metric unit, followed by a closing character like ".", "," or ")"
		$pattern = sprintf ( $pattern, $convertUnit['metric'] );
		
		while ( preg_match ( $pattern, $text, $matches ) )
		{
$matches[1] = str_replace ( ",", ".", $matches[1] ); // in case numbers are written like "6,6 m", we need to replace "," with "." // because we do not want to return 0, we have to make shure that the new value is not zero.
			$itterator = 0;
			do {
$value = round ( ( $matches[1] * $convertUnit['ratio'] ), $convertUnit['round'] + $itterator );
				++$itterator;
			} while ( $value == 0 || $itterator == 10 );
			
			$replacement = $value . "$2" . $convertUnit['imperial'] . "$4";
			$text = preg_replace ( $pattern, $replacement, $text, 1 );
		}
	}
	return $text;
}

/frank

9 okt 2006 kl. 16.18 skrev Ilaria De Marinis:

Hi Frank,
I think preg_replace_callback is a good solution for you.

If you don't want to use it, you can construct two arrays defining matches and replacements.

For example:
$matches
[230]
[120]
[340]

$replacements
[9.1]
[replace2]
[replace3]



After you stored matches in $matches using regular expression like yours,/preg_match_all <http://it.php.net/manual/en/function.preg- split.php>/ (([[:digit:]]+|[[:digit:]]+\.[[:digit:]]+)([[:blank:]]?) (mm), $string, $matches, PREG_SET_ORDER)

you can define $replacements by this way:
for(int =0; i<count($matches); i++){
$replacements[$i]=round((substr($matches[$i][0], 0, 3)) *0.039370079),1); //take the last part of match with no digits, I don't know if there are sure 3 digits
}

for(int i=0; i<count($matches); i++){
   preg_replace($string, $matches[$i][0], $replacement[$i]."in");
}

hope to help you

Ilaria

Frank Arensmeier wrote:

Hello all.

Is it possible to have a user defined function for the replacement within an ereg_replace (like preg_replace_callback)? I am working on a script that converts html pages with metric data into imperial data. My script takes text strings containing one or more instances of e.g. "123 mm", "321 mm", "123 kg", "123 cm2" and so on. The script searches the string with a pattern like:
"([[:digit:]]+|[[:digit:]]+\.[[:digit:]]+)([[:blank:]]?)(mm)"

When the script finds an instance, it stores the matches into an array - ereg ( $pattern, $textstring, $matches )

The replacement (for mm) looks like:
round ( ( $matches[1] * 0.039370079 ), 1 ) . $matches[2]  . "in"

Everything is working great accept when the string contains more than one instance for example of the metric unit mm. In that case, all instances of "xy mm" will be replaced with the first occurrence.

So, a text like:

"The product is 230 mm tall, 120 mm thick and 340 mm wide" will output as "The product is 9.1 in tall, 9.1 in thick and 9.1 in wide" - because the replacement string is based / calculated on the first occurrence 230 mm.

Alternatively, is there a way to limit ereg_replace to only replace one instance at a time?

Hopefully I am not too confusing...

regards,

/frank

ps. of course I have searched the manual and asked Google - no luck ds.



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De Marinis Ilaria
Settore Automazione Biblioteche
Phone: +3906-44486052
CASPUR - Via dei Tizii ,6b - 00185 Roma
e-mail: demarinis@xxxxxxxxx
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