Question
<?php
$number = array(0,1,two,three,four,5);
$num = preg_grep("/[0-5]/", $number);
print_r($num);
?>a.
Array([0]=>0 [1]=>1 [2]=>two [3]=>three [4]=>four [5]=>5)
b.
Array([2]=>two [3]=>three [4]=>four)
c.
Array([1]=> 1)
d.
Array([0]=>0 [1]=>1 [5]=>5)
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