在foreach循环外回显数组键时出错

Question

Why is it that when I setup an array like this:

$plans[] = array(
  'provider'  => 'Boost Mobile',
  'plan'   => 'Unlimited Gigs',
   'url'  => 'https://www.boostmobile.com/#!/shop/plans/monthly-phone-plans/',
  'price'      => 50,
  'duration' => 'month',
}

I get an arror if I echo out a key like this:

echo $plans['plan'];

//Notice: Undefined index: plan

BUT when I echo it out inside a foreach array it outputs the value?

Any help is appreciated

Answer 1

You have define $plan with array so no need to take [] with $plans because it create multi dimentional array.

I have added both example with and without [].

Note

$plans[] = array(); // It creates multi dimensional array
$plans = array(); // It creates simple array

Code

<?php

$plans[] = array(
  'provider'  => 'Boost Mobile',
  'plan'   => 'Unlimited Gigs',
   'url'  => 'https://www.boostmobile.com/#!/shop/plans/monthly-phone-plans/',
  'price'      => 50,
  'duration' => 'month');

print_r($plans);
echo $plans[0]['plan']; echo "

";

$plans2 = array(
  'provider'  => 'Boost Mobile',
  'plan'   => 'Unlimited Gigs',
   'url'  => 'https://www.boostmobile.com/#!/shop/plans/monthly-phone-plans/',
  'price'      => 50,
  'duration' => 'month');

print_r($plans2);
echo $plans2['plan'];  

Output

Array
(
    [0] => Array
        (
            [provider] => Boost Mobile
            [plan] => Unlimited Gigs
            [url] => https://www.boostmobile.com/#!/shop/plans/monthly-phone-plans/
            [price] => 50
            [duration] => month
        )

)

Unlimited Gigs

Array
(
    [provider] => Boost Mobile
    [plan] => Unlimited Gigs
    [url] => https://www.boostmobile.com/#!/shop/plans/monthly-phone-plans/
    [price] => 50
    [duration] => month
)

Unlimited Gigs

Check Demo : Click Here