preg_replace help needed

[eluser]CISCK[/eluser]
So, I have a comma delimitated string of 24 hour times:

Code:

$hours = "0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23";

I am matching each number in the string using:

Code:

$pattern = '/\d+/';

What would be the correct replacement to achieve:

12am, 1am, 2am, 3am, 4am, 5am, 6am, 7am, 8am, 9am, 10am, 11am, 12pm, 1pm , 2pm, 3pm, 4pm, 5pm, 6pm, 7pm, 8pm, 9pm, 10pm, 11pm

Thanks!

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Code:

$hours = "0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23";
$pattern = '/\d+/';
$replacement = 'PLEASE HELP!';
preg_replace($pattern, $replacement, $hours);