sub string replacment in PHP
<p>I have a string like:
$string = "/physics/mechanics/vectors/P-M-C (1).doc";</p>

<p>I want to get like this:</p>

<p>"/physics/mechanics/vectors/1-P-M-C (1).doc";</p>

<p>Please note that "1-" is added just before P in the original string.</p>

<p>Is it possible in PHP?
How the function in PHP should be used?</p>
