doudi2229 2012-06-12 01:49
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如何从字符串中找到“240x320”格式的分辨率大小?

I have a sample code:

$text = "240 x 400 pixels, 3.0 inches (~155 ppi pixel density)";

And using regex:

preg_match_all('/(.*)( x )(.*)/i', $text, $arr);

print_r($arr[0]);

Result not change, how to fix it ?

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  • dsxfa26482 2012-06-12 02:01
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    I'm guessing you want to change your regular expression to something like this:

    preg_match_all('/(\d+) x (\d+)/i', $text, $arr);
    

    The "." matches any character, so when you used .* it just matched the whole string---it doesn't matter what you put after it. With regular expressions, it's generally a good rule of thumb to be as specific as possible. In this case \d+ will match 1 or more numeric digits, so it will stop matching when it gets to the first non-numeric digit, in this case, a space.

    Here's the result of $arr that I get with your $text string and the updated regular expression:

    Array
    (
        [0] => Array
            (
                [0] => 240 x 400
            )
    
        [1] => Array
            (
                [0] => 240
            )
    
        [2] => Array
            (
                [0] => 400
            )
    
    )
    

    Hopefully it's closer to what you were looking for.

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