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Best way to compare two strings

I need to map various mobile features (about 30 features). But the comparison should be based on values ​​such as "800 mAh lithium-ion battery".

Suppose mobile "A" has a battery size of "800mAh Li-ion battery"

and the second mobile "B" has a "Li-ion Battery Battery", 400 mAh "

then A is better than B.

So how can I compare 800mAh and 400mAh, ignoring the dormant Li-ion battery,

in almost all 30 functions I need to do for such a comparison. How am I supposed to make a comparison at 4Mb vs 1GB.

I am currently trying to use the list function ($ a, $ b) = explode (). Is there a better solution.

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2 answers


It will depend on the lines. Given the two you provided as a limited sample, you can ignore non-numeric characters (also going out in periods) and then compare numbers. Something like that:

$number_a = preg_replace( '/[^0-9.]/', '', $string_a;
$number_b = preg_replace( '/[^0-9.]/', '', $string_b;

Then compare them as numbers:



if ( $number_a > $number_b ) {
    ...
}

This works as long as you always compare the same units, for example, you show examples. But if the units are different from each other, for example "800mAh, Li-ion battery" versus "Li-ion Battery, .4 AH", then this will not happen. You will need to add some more logic to analyze and interpret the units.

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How about extracting the number from your string and comparing them



$A = filter_var('800 mAH, Li-ion Battery', FILTER_SANITIZE_NUMBER_INT);

$B = filter_var('Li-ion Battery, 400 mAH', FILTER_SANITIZE_NUMBER_INT);

if($A > $B){
// A is better
}
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