word case format

hello there,
I have a php string and I would like to correct the format of some words..
$string='this pc is working slow because the pdf file is too big.. i should try and open it with my imac';
 
should be in this format
 
"this PC is working slow because the PDF file is too big.. i should try and open it with my iMac"
 
words changed PC, PDF, iMac

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XK8ERAsked:
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ycTINCommented:
just use str_ireplace isn't enough.

<?php
$string='this pc is working slow because the pdf file is too big.. i should try and open it with my imac';
 
echo formatCase($string);
 
function formatCase($str) {
	$specialwords = array('PC', 'PDF', 'iMac');
 
	$directory = array();
	foreach($specialwords as $special) {
		$directory[strtolower($special)] = $special;
	}
	$result = '';
	foreach (explode(' ',$str) as $word) {
		$key = strtolower($word);
		$result .= (isset($directory[$key]) ? $directory[$key] : $word).' ';
	}
	return trim($result);
}
?>

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jessc7Commented:
If you know the list of words you would like to replace, you could look at using the str_ireplace function:

http://us2.php.net/manual/en/function.str-ireplace.php
In your example, using the following should work:



$string='this pc is working slow because the pdf file is too big.. i should try and open it with my imac';
 
$search  = array('pc', 'pdf', 'imac');
$replace = array('PC', 'PDF', 'iMac');
$newString = str_ireplace($search, replace , $string);

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jessc7Commented:
One minor syntax change to the above:
$string='this pc is working slow because the pdf file is too big.. i should try and open it with my imac';
 
$search  = array('pc', 'pdf', 'imac');
$replace = array('PC', 'PDF', 'iMac');
$newString = str_ireplace($search, $replace , $string);

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jessc7Commented:
I think ycTIN is headed down a more reusable path, but I think it can be made more simpler. Since str_ireplace is case insensitive, you wouldn't need two arrays in my previous example. You also wouldn't need to search for alternative case in strings manually. Here's a simplified example that works for me:
$string='this pc is working slow because the pdf file is too big.. i should try and open it with my imac';
 
$words = array('PC', 'PDF', 'iMac');
$newString = str_ireplace($words, $words , $string);
 
echo $newString;

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