PHP的字符串比较不工作= =

Question

i have question on string comparison i have

if($decryptedname == $plain)
{
echo "success <br/>";
echo $_SESSION['decryptedname'];
}

in a for loop to go through a text file, decryptedname contain a string "Lee" and plain contain the data in my text files and printing line by line, since both of it contain a field with the value "Lee" i assume it should match and print success as well as the $decryptedname but it's not, below is the copy and pasted result, where lee is $decryptedname and those others are echo by $plain thru a for loop

Lee

Decrypted name is Lee

Decrypted email is mjlee181@hotmail.com

Decrypted message is testing

Answer 1

There are chances for whitespace getting added when you load contents from a text file , so in that case always do a trim() and then do the comparison.

Like this..

if(trim($decryptedname) == trim($plain))
{
echo "success <br/>";
echo $_SESSION['decryptedname'];
}

or if you are trying to check if the string contains in another string... you should be doing stripos() instead.

if(stripos($decryptedname,$plain)!==false)
{
    echo "success <br/>";
    echo $_SESSION['decryptedname'];
}

Answer 2

  <?php
        if (strcasecmp($decryptedname , $plain) == 0) {
            echo "success <br/>";
echo $_SESSION['decryptedname'];
    ?>

you can try this .May it help you

Answer 3

The above mentioned problem may be caused due to the '\\n' present at the end of the string. If the string "Lee" is present at the end of the line in the text file, it may automatically be appended with '\\n' in the end. So if you remove '\\n' from the end it might work fine. you can use the following function to do that:

$plain=str_replace("\\r\\n","",$plain);