PHP: Array declaration and named variable

Question

What is the deference between array('hi'=>$hello) and array(':hi'=>$hello)

I am using the second form to insert my data using prepare statement by extending PDO which is working fine. However when I change array declaration to first form array('hi'=>$hello) no data is being inserted, I was wondering how they both work.

Possible duplicate of [PHP prepared statement - what are parameter colon's used for?](http://stackoverflow.com/questions/17386469/php-prepared-statement-what-are-parameter-colons-used-for) — Kalkran, Feb 18 '16 at 07:52

score 1 · Accepted Answer · answered Feb 18 '16 at 07:51

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':hi' is a named variable and also an index/key in your array this can pass values to your database (Used in PDO).

'hi' is just an index/key in your array

answered Feb 18 '16 at 07:51

Matt Magallo

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score 0 · Answer 2 · edited May 23 '17 at 12:31

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Your first example:

array('hi' => $hello);

creates a key called 'hi', and your second example creates a key :hi. To use PDO parameters you need to prepend the parameters with a colon. The colon is used to designate and identify the parameters. See PDO prepared statement - what are colons in parameter names used for?

edited May 23 '17 at 12:31

Community

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answered Feb 18 '16 at 07:51

Kalkran

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PHP: Array declaration and named variable

2 Answers2