help need on preg_replace

[chinto09]

I am unable to find out why i am getting weird results.
Here is the code

$string = 'i bought this in hundred dollars';
$patterns = '/hundred dollars/';
$replace = '$100';

$result=preg_replace($patterns, $replace, $string);

echo $result;

//The above example will output
i bought this in 0

while i am expecting to replace 'hundred dollars' with $100 why i am getting 0 in the results.

Hope some body will explain me.

thanks

[nrg_alpha]

You need to escape the dollar sign in the replace string:

$replace = '\$100';

[chinto09]

it's working now.
thank you 🙂