two strings identical, but not equal when compared

Question

I have this little problem i couldn't solve on my own, i'm comparing two strings that are identical one taken from the database and the other from a text file, the values are always equal except for the last one

CODE FOR ARRAY FROM TEXT FILE

while (!feof($monfichier)) {
    $line = fgets($monfichier);
    $pieces = explode(" ", $line);
    $factureAgent[$nbb][0] = $pieces[0]; //id client
    $factureAgent[$nbb][1] = $pieces[1]; //consommation annuelle
    $factureAgent[$nbb][2] = $pieces[2]; //année
    $factureAgent[$nbb][3] = $pieces[3]; //id agent
    $month = explode(":", $pieces[4]);
    $factureAgent[$nbb][4] = $month[1]; //janvier
    $month = explode(":", $pieces[5]);
    $factureAgent[$nbb][5] = $month[1]; //fevrier
    $month = explode(":", $pieces[6]);
    $factureAgent[$nbb][6] = $month[1]; //mars
    $month = explode(":", $pieces[7]);
    $factureAgent[$nbb][7] = $month[1]; //avril
    $month = explode(":", $pieces[8]);
    $factureAgent[$nbb][8] = $month[1]; //mai
    $month = explode(":", $pieces[9]);
    $factureAgent[$nbb][9] = $month[1]; //juin
    $month = explode(":", $pieces[10]);
    $factureAgent[$nbb][10] = $month[1]; //juillet
    $month = explode(":", $pieces[11]);
    $factureAgent[$nbb][11] = $month[1]; //aout
    $month = explode(":", $pieces[12]);
    $factureAgent[$nbb][12] = $month[1]; //septembre
    $month = explode(":", $pieces[13]);
    $factureAgent[$nbb][13] = $month[1]; //octobre
    $month = explode(":", $pieces[14]);
    $factureAgent[$nbb][14] = $month[1]; //novembre
    $month = explode(":", $pieces[15]);
    $factureAgent[$nbb][15] = $month[1]; //decembre
    $nbb++;
}

HERE IS THE CODE

echo "<br>".$row[0]."is".$factureAgent[$i][$nb]."<br>";
if ($année==$annéeComp[0]) {
  if ($row[0]!=$factureAgent[$i][$nb]) {
    echo "<br>".$row[0]."is".$factureAgent[$i][$nb]."<br>";
    $ok = false;
  }
  $nb++;
  $nbr++;
}

OUTPUT

25is25
50is50
87is87
115is115
200is200
250is250
400is400
550is500
600is600
650is650
800is800
950is950
950is950

see image

LINE I'M READING FROM TEXT FILE

1 2000 2019 1 01:25 02:50 03:87 04:115 05:200 06:250 07:400 08:550 09:600 10:650 11:800 12:950
13 2000 2019 1 01:45 02:90 03:150 04:300 05:600 06:800 07:1000 08:1300 09:1450 10:1600 11:1800 12:2000

see image

Answer 1

That is maybe you are using == instead of === . i might suggest using strcasecmp if you do not want the case to be considered or use strcmp if you want case to be considered.

strcasecmp()

strcmp()

pay attention to the comparison of the result of these to functions to 0 with === so that you be sure they are equal for example: if (strcmp('Hello, 'Hello') === 0) ...

Be aware when using == and ===

(1 == '1') //Equal -- not taking into consideration the type but just the value

(1 === '1') //Not equal -- taking into consideration the type and the value

Just for your information for not you use != or !==

Answer 2

Comparing string from different sources can lead to unexpected results.

One thing you can do is casting your values to the same type and then compare. For example:

if (intval('1') === intval('01')) ...

This way you are getting the two sides to integer and its just an integer comparison.

Note that if you cast a value which is not numeric the function will always return 0