Comparing strings

Question

<?php
    $string1 = "12 jan";
    $string2 = "12 aprail, 13 march";
    $result = strcmp($string1, $string2);

    switch ($result) {
        case -1: print "date are not identical"; break;
        case 0: print "date1"; break;
        case 1: print "date are identical"; break;
    }
?>

when i use this code it will show me a date are identical even the value ex when i compare the value 12 jan to 12 march it will show me value are identical but the value is differ

Delan Azabani · Accepted Answer · 2011-03-02 08:01:13Z

6

You have used the wrong return values.

-1 and 1 mean that the strings are not identical (less than and greater than, respectively).
0 means that the strings are identical.

answered Mar 2, 2011 at 8:01

Delan Azabani

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Comments

codaddict · Accepted Answer · 2011-03-02 08:01:52Z

1

The function strcmp returns

< 0 if str1 is less than str2; 
> 0 if str1 is greater than str2, and 
0 if they are equal.

answered Mar 2, 2011 at 8:01

codaddict

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Comments

Frank · Accepted Answer · 2011-03-02 08:02:30Z

1

strcmp "returns < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are equal". You're printing "date are identical" when $result == 1, which is incorrect.

answered Mar 2, 2011 at 8:02

Frank

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Comments

Barry Brown · Accepted Answer · 2011-03-05 05:43:55Z

1

strcmp returns:

a negative number if string1 is less than string2
zero if the two strings are equal
a positive number of string1 is greater than string2

It is incorrect to assume that strcmp will return only -1, 0, or 1.

edited Mar 5, 2011 at 5:43

answered Mar 2, 2011 at 8:04

Barry Brown

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