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    copied!<p>please provide a working array fragment in future.</p> <pre><code>$transactions = array ( array( 'SiteID' =&gt; 147, 'Amount' =&gt; '500.00', 'TransactionType' =&gt; 'Deposit' ), array( 'SiteID' =&gt; 147, 'Amount' =&gt; '500.00', 'TransactionType' =&gt; 'Redemption'), array( 'SiteID' =&gt; 147, 'Amount' =&gt; '1500.00', 'TransactionType' =&gt; 'Deposit' ), array( 'SiteID' =&gt; 147, 'Amount' =&gt; '200.00', 'TransactionType' =&gt; 'Reload' ), array( 'SiteID' =&gt; 150, 'Amount' =&gt; '100.00', 'TransactionType' =&gt; 'Deposit' ), array( 'SiteID' =&gt; 3, 'Amount' =&gt; '500.00', 'TransactionType' =&gt; 'Redemption' ), array( 'SiteID' =&gt; 150, 'Amount' =&gt; '200.00', 'TransactionType' =&gt; 'Redemption' ), array( 'SiteID' =&gt; 3, 'Amount' =&gt; '500.00', 'TransactionType' =&gt; 'Deposit' ), array( 'SiteID' =&gt; 3, 'Amount' =&gt; '200.00', 'TransactionType' =&gt; 'Deposit' ), array( 'SiteID' =&gt; 3, 'Amount' =&gt; '200.00', 'TransactionType' =&gt; 'Reload' ), array( 'SiteID' =&gt;147, 'Amount' =&gt; '500.00', 'TransactionType' =&gt; 'Redemption' ) ); $totals = null; foreach ($transactions as $t){ $amount = (float) $t['Amount']; if (isset($totals[ $t['SiteID'] ][ $t['TransactionType'] ])){ $totals[ $t['SiteID'] ][ $t['TransactionType'] ] += (float) $amount; } else { $totals[ $t['SiteID'] ][ $t['TransactionType'] ] = (float) $amount; } } print_r ($totals); </code></pre> <p>This will produce a result like this:</p> <pre> Array ( [147] => Array ( [Deposit] => 2000 [Redemption] => 1000 [Reload] => 200 ) [150] => Array ( [Deposit] => 100 [Redemption] => 200 ) [3] => Array ( [Redemption] => 500 [Deposit] => 700 [Reload] => 200 ) ) </pre> <p>If you can deal with php notice warnings the loop can be shortened to:</p> <pre><code>foreach ($transactions as $t){ $totals[ $t['SiteID'] ][ $t['TransactionType'] ] += (float) $t['Amount']; } </code></pre>
 

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