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1 <?php |
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2 |
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3 |
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4 function ebc_to_srm($ebc) |
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5 { |
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6 // Srm = -1.32303E-12*Ebc4-0.00000000291515*Ebc3+0.00000818515*Ebc2+0.372038*Ebc+0.596351 |
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7 return -1.32303E-12 * pow($ebc, 4) - 0.00000000291515 * pow($ebc, 3) + 0.00000818515 * pow($ebc, 2) + 0.372038 * $ebc + 0.596351; |
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8 // return $ebc * 0.508; |
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9 } |
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10 |
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11 |
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12 function srm_to_ebc($srm) |
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13 { |
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14 // EBC = 0.000000000176506*Srm4+ 0.000000154529*Srm3-0.000159428*Srm2+2.68837*Srm-1.6004 |
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15 // |
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16 // Formule van Adrie Otten. brouwhulp. |
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17 $ebc = 0.000000000176506 * pow($srm, 4) + 0.000000154529 * pow($srm, 3) - 0.000159428 * pow($srm, 2) + 2.68837 * $srm - 1.6004; |
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18 return round($ebc); |
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19 } |
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20 |
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21 |
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22 ?> |