i want a command or a script that i give it a sentince and it finds if there is a word that avilible in the sentence twice and if yes it delets it

i want a command or a script that i give it a sentince and it finds if there is a word that available in the sentence twice and if yes it deletes one of the words.
for example
$sentince = "lol i am on lol fire help me "
after the command or the script i get
$sentence = "lol i am on fire help me"
mgtm3Asked:
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cammjCommented:
Not sure if theres a better way of doing this but

$string = "bob sam cat bob"; // the input text
$temp = explode(" ", $string); // create an array with every word
$temp2 = array_unique($temp); // remove duplicates from the array
$string2=implode(" ", $temp2); // form the array back in to a string

$string2 wouldnt have any duplicates
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cammjCommented:
A function for what I just mentioned

function foo($strText) {
$temp = explode(" ", $strText); // create an array with every word
$temp2 = array_unique($temp); // remove duplicates from the array
return implode(" ", $temp2); // form the array back in to a string
}
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