Re: [PHP-DB] Im seeking a solution to check for duplicate entries with an other sequence

2010/1/11 omar zorgui <[email protected]>:
> $sentences[] = "this is a example sentence";
> $sentences[] = "a this is example sentence";
> $sentences[] = "example this is a sentence";
> $sentences[] = "this is a example sentence for a function";


<?php
// Define data.
$Sentences = array
	(
	"this is a example sentence",
	"a this is example sentence",
	"example this is a sentence",
	"this is a example sentence for a function",
	);

// Record hashes of the sorted words in each sentence.
$Hashes = array();
$Reduced = array_filter
	(
	$Sentences,
	function($Sentence)
		use(&$Hashes)
		{
		// Explode the sentence into words but forced to lower case.
		$Words = explode(' ', strtolower($Sentence));
		
		// Sort the words
		sort($Words);
		
		// If the hash of the serialized words array is not already known
		if (!in_array($Hash = md5(serialize($Words)), $Hashes))
			{
			// then add it and return true.
			$Hashes[] = $Hash;
			return True;
			}
		else
			{
			// else return false to filter out this sentence.
			return False;
			}
		}
	);

// Show the reduced sentences.
print_r($Reduced);
?>


outputs ...

Array
(
    [0] => this is a example sentence
    [3] => this is a example sentence for a function
)



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