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Article:
  Working with Files in PHP, Part 3
Subject:   line !== 'false'
Date:   2003-03-12 15:22:26
From:   anonymous2
The article states that you need to use the !== comparison operator:
"Without this type of comparison, the while loop would end prematurely if a directory (or filename) existed with the name of false"


I can't seem to get the loop to stop when it encounters a directory named false even if I leave out the !== and use != instead.



Using windows.

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  • line !== 'false'
    2003-03-12 16:39:03  John Coggeshall | O'Reilly Author [View]

    Although this behavior may work (not using the 'identical' comparison and just using a standard comparison) it is not to be relied on. For instance:

    $myfile = "0"; // a filename whose name is '0'
    if($myfile == false) {
    echo "$myfile is false\n";
    } else {
    echo "$myfile is true.\n";
    }

    In this case, the string '0' will be evaluated as an integer value '0' which is in turn a boolean false. In order for this to behave properly you'd need to use the identical comparison === operator.

    John