<?php
 
$html = <<<EOT
<div id="isOffered">      
    <a class="price  " href="javascript:;">
        <span class="priceText wide  UK">1/4</span>
        <span class="priceText wide  EU">1.25</span>
        <span class="priceText wide  US">-400</span>
        <span class="priceText wide  CH">1.25</span>
        <span class="priceChangeArrow" ></span>
        <input type="hidden" class="betCode" value="0]SK@84899932@323698807@NB*1~4*0*-1*0*0"/>
        <input type="hidden" class="decValue" value="1.25"/>
        <input type="hidden" class="originalBetCode" value="0]SK@84899932@323698807@NB*1~4*0*-1*0*0"/>
     </a>
</div>
 
<div id="isOffered">      
    <a class="price  " href="javascript:;">
        <span class="priceText wide  UK">3/1</span>
        <span class="priceText wide  EU">4.00</span>
        <span class="priceText wide  US">+300</span>
        <span class="priceText wide  CH">4.00</span>
        <span class="priceChangeArrow" ></span>
        <input type="hidden" class="betCode" value="0]SK@84899932@323698809@NB*3~1*0*-1*0*0"/>
        <input type="hidden" class="decValue" value="4.00"/>
        <input type="hidden" class="originalBetCode" value="0]SK@84899932@323698809@NB*3~1*0*-1*0*0"/>
    </a>
 </div>
EOT;
 
libxml_use_internal_errors(true);
 
$DOM =  new DOMDocument();
$DOM->loadHTML($html);
$xpath = new DomXpath($DOM);
 
$decValues = $xpath->query('//input[@class="decValue"]/@value');
$betCodes  = $xpath->query('//input[@class="betCode"]/@value');
$originalBetCodes = $xpath->query('//input[@class="originalBetCode"]/@value');
 
$arrValues = array_map(null, iterator_to_array($decValues), 
                             iterator_to_array($betCodes),
							 iterator_to_array($originalBetCodes));
 
$percent = 20.0 / 100.0; 
$mult = 5;
 
foreach($arrValues as $value){
    $floatValue = floatval($value[0]->nodeValue);
    $discountValue = $floatValue - ($percent * $floatValue);
    $expr = (((($discountValue < 1)? round($discountValue): $discountValue) - 1) * $mult);
    $finalValue = "*". $expr. "~". $mult. "*";
 
	$betValue = $value[1]->nodeValue;
	$repl = preg_replace('/\*(\d+)~(\d+)\*/', $finalValue, $betValue);
	$value[1]->nodeValue = $repl;
	$value[2]->nodeValue = $repl;
}
 
libxml_clear_errors();
echo $DOM->saveHTML();

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