If string contains number, save number in variable?

So heres what i have. I have an array of $_POST elements and some end with a number, some do not. So whatI have already is:

foreach ($_POST as $field_name => $value){ }

What id like to d开发者_运维问答o it put an if statement within the foreach, and say 'if $field_name contains a number, save that number in a variable $num'. And then foreach $field_name that contains that same $num, do this...

Im pretty clear on the concept, but not the actual code. The first step would be to determine if the the field contains a digit 1-9 within it. Any suggestions?

Use preg_match!

if( preg_match('/\d+/', $field_name, $matches) ) {
    $num = $matches[0];
    // Do other stuff here
}

(Edit: simplified)

Better do it without regular expression its much faster!!

if (strcspn($_Post[$i], '0123456789') != strlen($_Post[$i])){}

no need to start the regularexpression engine...

You can try this:

preg_match_all('/[1-9]/', $field_name, $matches);

$matches should contain now all number occurencies stored in array. Proccess it how you prefer :D