Using str_replace to test for existence in an array

I have the following function

function blah($string) {
    $match = array('red', 'green', 'blue');
    $replace = array('1', '1,', '0');
    return str_replace($match, $replace $string);
}

What I'm trying to do is, if the input is not in the match array, re开发者_运维问答turn 0.

Since this is only used on the back end once/day, performance isn't the biggest issue but since i'm still learning PHP, I'd like to understand the proper way of doing this.

Any help is really appreciated! Thanks in advance!

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I suggest using PHP's built-in in_array() function instead of writing your own.

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How about:

function blah($string) {
    $matches = array('red', 'green');        
    return in_array($string, $matches);
}

Another thing I might add is that you should avoid using a function like str_replace (which, at a glance, would mean replacing strings) for something that is testing existence as it might confuse other programmers (or yourself) when reading the code.

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I ended up using the following code:

function approved($input) {
$match = array('red','green','blue');
if(in_array(strtolower($input), $match)) {
   return 1;
} else {
    return 0;
}
}