- print_r: documentation ( source)
- array_keys: documentation ( source)
<?php
$array = array( '730400' => 29910, '730230' => 29910 ,'730205' => 1000 ,'730404' => 29910, '730202' => 1000, '730601' => 21840 );
$idPartidas=array_keys($array);
//$keys = array_keys($array, '730205');
print_r($idPartidas);
?>