Accessing array value by direct passing value of another array in string

Question

I tried to access the array value by passing the value of another array element in the string.

Here is the example.

$arr = array("asif", "ali");
$arr2 = array("asif" => 3, "ali" => 5);

echo "value of data $arr2[$arr[0]]";

It is giving me the error as

syntax error, unexpected '[', expecting ']'

I tried to access the value out of the string like the following.

$arr = array("asif", "ali");
$arr2 = array("asif" => 3, "ali" => 5);

echo $arr2[$arr[0]];

It is working fine.

Then I tried to use just a single array in the string and pass the other array's element value by variable.

$arr = array("asif", "ali");
$arr2 = array("asif" => 3, "ali" => 5);

$name = $arr[0];

echo "value of data $arr2[$name]";

It is also working fine.

Is there something wrong in the syntax?

it's not a bug, you just need wrap it in curly braces if you want it interpolated in the quoted string — Kevin
– Kevin, Commented Dec 3, 2020 at 9:49

Ro Achterberg · Accepted Answer · 2020-12-03 09:50:16Z

3

You need complex syntax to expand arrays like that.

Change this:

echo "value of data $arr2[$arr[0]]";

To this:

echo "value of data {$arr2[$arr[0]]}";

answered Dec 3, 2020 at 9:50

Ro Achterberg

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