将一个数组的所有key-value都转为大写（小写）
<?php
$q6 = array("A"=>"Acer",
"B"=>"Asus",
"C"=>"BenQ",
"D"=>"Compower",
"E"=>"Dell",
"F"=>"Fujitsu",
"G"=>"HP",
"H"=>"IBM",
"I"=>"Lenovo",
"J"=>"LG",
"K"=>"NEC",
"L"=>"Samsung",
"M"=>"SONY",
"N"=>"Toshiba");
var_dump( unserialize(strtolower(serialize($q6))));
?>
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