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<?php $array = array( array( 'id' => 1, 'price1' => 16, 'price2' => 10, 'price3' => 3 ), array( 'id' => 2, 'price1' => 19, 'price2' => 2, 'price3' => 6 ), array( 'id' => 3, 'price1' => 14, 'price2' => 32, 'price3' => 1 ) ); foreach($array as $item) { $lowestKey = ''; foreach($item as $key => $value) { if(strpos($key, 'price') === 0) { if($lowestKey == '') { $lowestKey = $key; } else { if($value < $item[$lowestKey]) { $lowestKey = $key; } } } } echo 'lowest for id ' . $item['id'] . ': ' . $item[$lowestKey] . "\n"; }
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