following code is not working fine sometimes

i tried following code. it sometimes misses some key and value. Anybody can give idea why it is happening.

$test= array(rand(0, 9)=>"a",rand(0, 9)=>"b",rand(0, 9)=>"c",rand(0, 9)=>"d",rand(0, 9)=>"e");
print_r($test);
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