Description:
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In PHP4, foreach($array) runs without error if $array is an uninitialized array. The foreach block is executed 0 times. This is consistent with other 0 iteration blocks such as while(false) and for($i=0;$i<0). In PHP5, an inconsistency was introduced by throwing an "invalid argument" warning when $array is an uninitialized array. In upgrading to PHP5 I had to add a surrounding if($array) block to hundreds of foreach blocks to eliminate the possible warning message.

Reproduce code:
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unset($array);//just to clarify initial conditions
foreach($array['phone'] as $key=>$phone){
 echo $phone.'<br/>';
}

Expected result:
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I expect no errors and nothing echoed. This is PHP4 behavior.

Actual result:
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In PHP5, following message pointlessly prints:
Warning: Invalid argument supplied for foreach() in ...