Retrieve an associative array value with a variable as key

问题

Here's some code that I have trouble with. I don't know why, I feel I have used this code many times without any problems.

$people['firstname'] = "Fred";
$t = "firstname";
echo $people[$t] ;

echo returns nothing, whereas i expect it to return Fred.

Thanks for your help, Marc

回答1:

Not sure why this isn't working for you.

$people['firstname'] = 'testvalue';

$key = 'firstname';

$value = $people[$key];

echo $value;

Works as expected, echos out "testvalue"

Double check your spelling and be consistent with your ticks (purely stylistic, I'm sure.)

回答2:

I think you can pass associative array value as variable . this is working for me

@$username=$_POST['username'];
@$password=$_POST['password'];

$result=array(
'username'=> "".$username."",
'password'=> "".$password.""
);

回答3:

OK I found solution for mine looks like variable continue none ASCII character so I have to remove them an it's works

$country = preg_replace('/[[:^print:]]/', '', $country);
$CCodes2=$CCodes[$country];

for you should check your php file encoding or if you use WYSIWYG make sue remove any formated none ASCII text before paste it .

来源：https://stackoverflow.com/questions/5105756/retrieve-an-associative-array-value-with-a-variable-as-key