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@ 2014-03-10T12:48:44Z

<?php
$array = array(Array('b','d'), 
                Array('c','a'),
                Array('b','d'),
                Array('a','d'),
                Array('c'),
                Array('c'),
                Array('a','d','e'),
                Array('d','b')
                 );
$occur = array();
foreach ($array as $item) {
    foreach ($item as $k => $v) {
        $occur["$k == $v"]++;
    }
}

print_r($occur);

Output
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print_r: documentation ( source)

preferences:dark modelive preview

45.84 ms | 402 KiB | 5 Q