If I have this array:
$foo[0] = 'bar';
$foo[1] = 'bar bar';
echo $foo[0][1];
// result
a
// i.e the second letter of 'bar'
I want to check that $foo[0][1] is not set i.e if I had:
$foo[0][1] = 'bar';
it would evaluate to true, but in my original example of $foo[0] = 'bar' I would expect that:
isset($foo[0][1])
would return false;
What's the correct way to test that please.
PHP doesn't have multidimensional arrays. It has arrays of arrays. It's important to understand the difference.
You need to do:
if (is_array($foo[0]) && isset($foo[0][1])) {
...
}
doh
it's ->
array_key_exists($foo[0][1]);
I'm still confused as to why PHP thinks the $foo[0][1] is set though...
if (is_array($foo[0]));
and http://php.net/manual/en/language.types.string.php#language.types.string.substr for reference on returning "a";
By using $foo[0][1], you are actually accessing the first character of the string $foo[0].
