php - String has the same value repeated after space -

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i need remove duplicate, don't know how call exactly

$string = "this sample sample"

as can see there "this sample" twice in single string. have many strings (with of course different text, repeated again) , need bulk remove duplicate text, don't have idea how this. result want is:

$string = "this sample"

try this:

<?php     $text = "this sample sample";     echo $splitstring1 = substr($text, 0, floor(strlen($text) / 2)); ?>

i hope can you


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