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@ 2012-12-10T18:38:23Z

<?php

$myObj = (object)array('id' => 'foo', 'cat_1' => 'bar', 'cat_2' => 'baz');

$count = 0;
foreach ($myObj as $key => $value) {
    if (strpos($key, 'cat_') === 0) {
        $count++;
    }
}

var_dump($count);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
strpos: documentation ( source)

preferences:dark modelive preview

34.27 ms | 402 KiB | 5 Q