PHP String Comparison Issue

Question

I can not figure out where I'm going wrong.

I've done so many string comparisons before and this one just refuses to work, the code is below;

$comparison_string = 'Transfers';

if ($location_name_chk == 0)
    $location_name_chk = 'Not_Transfers_Location';

echo $location_name_chk;
if(strcasecmp($location_name_chk, $comparison_string) == 1) {
    echo 'Location not Transfers';
    die();

Essentially, it's not getting to the part where it's comparing the strings.

I can 100% confirm that $comparison string == Transfers and that $location_name_chk == Not_Transfers_Location as the echo $location_name_chk does show correctly in the Network Display tab.

Any ideas? I have tried a range of different ideas that are in other questions, but to no avail (trim, strcasecmp etc)

It returns a positive number when the first string is higher than the second string, it returns a negative number when the first string is lower. — Barmar
– Barmar, Commented Apr 10, 2019 at 12:04
Hi Barmar, what do you mean by higher sorry? The second piece of code isn't being reached either. else if(strcasecmp($location_name_chk, $comparison_string) == 0) { echo "Location is Transfers"; } — foggy839_33
– foggy839_33, Commented Apr 10, 2019 at 12:08
He's saying change your test to == 0 instead of == 1. When the strings are the same you'll get 0 returned. — Dave
– Dave, Commented Apr 10, 2019 at 12:09
It's like dictionary order. If the word would be later in the dictionary, it's higher. — Barmar
– Barmar, Commented Apr 10, 2019 at 12:11

Community · Accepted Answer · 2020-06-20 09:12:55Z

Sometime (in fact, always), reading the manual helps a lot.

strcasecmp ( string $str1 , string $str2 ) : int

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

Some examples :

strcasecmp("abc", "Abc"); // 0

strcasecmp("abc", "Abcd"); // negative number (-1)

strcasecmp("abc", "Abcdefg"); // negative number (-4)

strcasecmp("Abcd", "abc"); // positive number (1)

strcasecmp("Abcdefg", "abc"); // positive number (4)

strcasecmp("abc", "def"); // negative number (-3)

strcasecmp("def", "abc"); // positive number (3)

In your code, change this :

if(strcasecmp($location_name_chk, $comparison_string) == 1)

To this

//     Notice this --------------------------------------V
if(strcasecmp($location_name_chk, $comparison_string) == 0)

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