PHP string comparison gives wrong output:

Question

I am using this code for comparing string values in a method, which work perfectly. But for some value it gives wrong value, for example below values:

Code:

$string1 = "65";
$string2 = "5-fold";
$result = strcasecmp($string1, $string2);

switch ($result) {
    case -1: print "65 comes before 5-fold"; break;
    case 0: print "65 and 5-fold are the same"; break;
    case 1: print "65 comes after 5-fold"; break;
}

Output:

65 comes after 5-fold

I use this code for sorted array list, which sort them like ( 65 comes before 5-fold ). may be this output of because the " - " or something else i don't know. Do you have any idea about this.....

Below code Sort the multi-dimensional array:

       foreach($index_terms as $c=>$key) {
            $sort_id[] = $key['id'];
            $sort_term[] = $key['term'];
            $sort_freq[] = $key['freq'];
        }

        array_multisort($sort_term, SORT_ASC, $index_terms);

yes you are right, but what i mean is to consider "5-fold" as a whole string....like what php function array_multisort() sort them..... — ime.devdesks
– ime.devdesks, Commented Apr 23, 2012 at 6:56
$index_terms is actually the big index terms array....and the sor_term is sorted terms array created for the sorting of big index terms array.... — ime.devdesks
– ime.devdesks, Commented Apr 23, 2012 at 10:25

Jack · Accepted Answer · 2012-04-23 06:49:08Z

1

You're comparing 65 to 5-fold. It returns -1 if 65 is less than 5-fold and 1 if 65 is greater than 5-fold.

65 is greater than 5-fold... I don't see the problem?

What is 5-fold supposed to be that you want 65 to come before it?

answered Apr 23, 2012 at 6:49

Jack

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4 Comments

ime.devdesks Over a year ago

yes: because i sorted the list already on "array_multisort()" which place 65 before 5-fold...

CWSpear Over a year ago

Show us the code that puts 65 before 5-fold, because I don't think we're understanding. array_multisort() can sort based off the ordering of another array and may not ever even be comparing 65 to 5-fold. I think the issue may be a misunderstanding of array_multisort()?

ime.devdesks Over a year ago

I have updated my question, for the array_multisort() method.

Jack Over a year ago

Have you tried array_multisort($sort_term, SORT_ASC, $index_terms, SORT_ASC);?

Dr.Kameleon · Accepted Answer · 2012-04-23 06:53:59Z

0

Code :

<?php
    $string1 = "65";
    $string2 = "5-fold";
    $result = strcasecmp($string1, $string2);

    echo $result;
?>

Output :

1

Hint : There's nothing wrong with your output. 1 means the second operand is greater, -1 means the first operand is greater.

answered Apr 23, 2012 at 6:53

Dr.Kameleon

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1 Comment

ime.devdesks Over a year ago

I know it return 1, but i sorted the list on array_multisort() which place the 65 before 5-fold in the list...now i want a comparison which do work like array_multisort().....

Jonathan de M. · Accepted Answer · 2012-04-23 06:56:49Z

0

try to use Intval

strcasecmp compare the binary value of your string

$string1 = intVal("65"); 
$string2 = intVal("5-fold");  
$result = strcasecmp($string1, $string2);

switch ($result) {
    case -1: print "65 comes before 5-fold"; break;
    case 0: print "65 and 5-fold are the same"; break;
    case 1: print "65 comes after 5-fold"; break; }

answered Apr 23, 2012 at 6:56

Jonathan de M.

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