PHP除以零？

Question

两小时前,以下脚本有效.现在由于某种原因,我收到一个错误"警告:在第30行的_中除以零".这是脚本.任何人都可以告诉我我做错了什么以及如何纠正它？

基本上这个脚本是从另一个网站上的两个元素中提取数据,将它们分开得到一个数字,而这个数字又用于设置元素的宽度.对此进行了一段时间的故障排除 非常感谢提前!

<?php
define("FFF_SIXDEGREES", "http://www.stayclassy.org/fundraise?fcid=257739");

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, FFF_SIXDEGREES);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

if(!($results = curl_exec($curl))) {
    print("{ \"total\": \"$0.00\" }");
    return;
}

$pattern = '/<li class="goalTitle">Raised so far:<\/li>\s*<li>\$([\d\.,]+)<\/li>/';
preg_match($pattern, $results, $matches);

$total = $matches[1];
$total = str_replace(",", "", $total);

// printf("<h2 class=\"raised-total\">$%s</h2>", formatMoney($total, true));

$pattern2 = '/<li class="goalTitle">My goal:<\/li>\s*<li>\$([\d\.,]+)<\/li>/';
preg_match($pattern2, $results, $matches);

$total2 = $matches[1];
$total2 = str_replace(",", "", $total2);

// printf("<h2 class=\"goal-total\">$%s</h2>", formatMoney($total2, true));

$diff = ($total/$total2) * 100; // THIS IS THE LINE OF CODE IN QUESTION

function formatMoney($number, $fractional=false) 
{
    if ($fractional) {
        $number = sprintf('%.2f', $number);
    }
    while (true) {
        $replaced = preg_replace('/(-?\d+)(\d\d\d)/', '$1,$2', $number);
        if ($replaced != $number) {
            $number = $replaced;
        } else {
            break;
        }
    }
    return $number;
} 
echo "<div class=\"progress-header\" style=\"width:$diff%;\"><span class=\"raised-amount\">$$total</span><span class=\"goal-amount\">$$total2</span></div>";

？>

Answer 1

错误消息在这里很有帮助.在那条线上:

$diff = ($total/$total2) * 100;

$ total2变量可能有时等于0,因此php无法执行计算(不可能除以零).所以你可以做这样的事情:

if($total2) // This condition will be true if $total2 != 0
    $diff = ($total/$total2) * 100;
else
    $diff = 0;

另外,我可以在你的代码中看到$ total和$ total2是字符串,转换为float.这也可能是错误的根源.您应该使用floatval强制转换为float:

if(floatval($total2))
    $diff = ( floatval($total) / floatval($total2) ) * 100;
else
    $diff = 0;