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
)
--
-----
Richard Quadling
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