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<?php
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$x = array(
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'value1' => 3021,
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'value2' => 2365,
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'value3' => 5215,
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'value4' => 5214,
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'value5' => 2145);
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reset($x); // optional.
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arsort($x);
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$key_of_max = key($x);
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echo "Index of the highest value : ".$key_of_max."\n";
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?>
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