douzhuo1858 2018-05-19 01:20
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在做了等式之后,PHP将不会回应答案

I was just experimenting with PHP trying to get it to find how many bytes are being used in a directory, and convert it to Megabytes. The "totalSpace variable will echo the ammount of bytes, but When I try to echo "newValue" after having it do an equation it just gives the or die message. It is probably something simple, but I am very inexperienced with PHP or any other server-sided or programing languages.

<?php
$totalSpace = disk_total_space("./") or die("Error DFS");
echo $totalSpace;

if ($totalSpace > 1048576) {
$totalSpace / 1048576 == $newValue;
}

echo $newValue or die("Error");
?>

I tried looking on Stack Overflow and other sources for answers to this question, but couldn't really find anything. What am I doing wrong here?

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  • dsfdsf46465 2018-05-19 01:27
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    == tests whether two values are equal, it doesn't make them equal. To make a variable equal to an expression, use an assignment.

    $newValue = $totalSpace / 1048576;
    

    Also, echo returns undefined regardless of what it's printing, so it makes no sense to put or die("Error") after it. It can never fail, so it doesn't return a value that indicates success or failure. Just do:

    echo $newValue;
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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