<?php $original_array = Array( '53_0.1', '53_0.3', '54_0.2', '54_0.1', '54_0.1', '54_0.19', '56_0.19', '56_0.50' ); foreach ($original_array as $v) { $result[strstr($v, "_", true)] = $v; } var_export(array_values($result));
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