Imprimir Array por dato no por posicion

[jchavez]

cuando imprimo el array con print_r($oldbets); me arroja lo siguiente

Array ( [0] => stdClass Object ( [mid] => 106 [dat] => 2B [dat1] => 2F [al] => 2 [it] => 1 ) [1] => stdClass Object ( [mid] => 108 [dat] => 1B [dat1] => 3D [al] => 1 [it] => 0 ) [2] => stdClass Object ( [mid] => 109 [dat] => 1A [dat] => 3C [al] => 5 [it] => 6 )

cuando busco con array_search no me arroja resultados

echo array_search("2F",$oldbets);