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Assigning Values inside an array
$a = array( $b1 = "b1", $b2 = "b2", array($b3 = "b3", $b4 = "b4"));

echo $$$$$a[2][1];

$a = array( $b1 = "b1", $b2 = "b2", array($b3 = "b3", $b4 = "b4"));

Array("b1","b2", Array("b3", "b4"));

Array(0 => "b1", 1 => "b2", 2 => Array(0 => "b3", 1 => "b4"));

Array($b1 = "b1");

$b1 = "b1"

$a = array( "b1", "b2", array("b3", "b4"));

if ($b1 = 'foo') {
    echo $b1; // prints foo
}