<?php function roundToValues( $tax, array $possibleTaxes ) { $differences = array(); foreach( $possibleTaxes as $possibleTax) { $differences[ $possibleTax ] = abs($possibleTax - $tax); } return array_search(min($differences), $differences); } $possibleTaxes = array( '0' => '0', '20' => '0-20', '50' => '20-50', '100' => '50-100', '200' => '100-200', '500' => '200-500', ); var_dump( roundToValues(19,$possibleTaxes) ); ?>
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