PHP isset returns true but should be false
My project is in cakePHP but I think this is an aspect of native PHP that I am misunderstanding..
I have an afterFind($results, $primary = false) callback method in my AppModel . On one particular find if I debug($results); I get an array like this
array(
'id' => '2',
'price' => '79.00',
'setup_time' => '5',
'cleanup_time' => '10',
'duration' => '60',
'capacity' => '1',
'discontinued' => false,
'service_category_id' => '11'
)
In my afterFind I have some code like this:
foreach($results as &$model) {
// if multiple models
if(isset($model[$this->name][0])) {
....
The results of the find are from my Service model so inserting that for $this->name and checking if(isset($model['Service'][0])) should return false but it returns true? if(isset($model['Service'])) returns false as expected.
I am getting the following PHP warning:
Illegal string offset 'Service'
so what's going on here? why does if(isset($model['Service'][0])) return true if if(isset($model['Service'])) returns false?
UPDATE:
I still don't know the answer to my original question but I got around it by first checking if $results is a multidimensional array with
if(count($results) != count($results, COUNT_RECURSIVE))
Use array_key_exists() or empty() instead of isset() . PHP caches old array values strangely. They have to be manually unset using unset()
isset() does not return TRUE for array keys that correspond to a NULL value, while array_key_exists() does.
String offsets provide a mechanism to use strings as if they were an array of characters:
$string = 'abcde';
echo $string[2]; // c
$model is indeed a string for all keys except discontinued.
As for the isset($model['Service'][0]) return value, I'm a bit surprised. This is a simplified test case:
$model = '2';
var_dump(isset($model['Service'])); // bool(false)
var_dump(isset($model['Service'][0])); // bool(true)
There must be a reason somewhere. Will have a dig..
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