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$a = 'aa';
$b = 'bb';
$array = array (
'a' => $a,
'b' => $b
);
$str2 = json_encode ( $array );
echo $str2;
建议:给字符串赋值尽量少用双引号,用单引号。$a = "aa";
$b = "bb";
$array = array();
$array['a'] = $a;
$array['b'] = $b;
echo json_encode($array);
demo:
http://sandbox.onlinephpfunctions.com/code/d3f616489979148ab4896c38b8a17b034259daab