Question

我有这个foreach，它将邮政编码$searchvalue与一系列地区相匹配。如果没有if，else语句将完成其工作并成功执行。

但是，当我取消注释else时，else始终会被执行。

为什么会这样？

foreach ($districts['district'] as $district) {
    if (in_array($searchvalue, $district['postalcodes'])) { //Search for known Postal Code
        $emails[] = $district['email'];

        //Assign new mail address
        $notification['to'] = implode("",$emails);

        //Continue sending email
        return $notification; //this succeeds without the else below. When the Else is uncommented, this is not executed.
    } 
    else {
        //No known postal code found, fallback
        echo "no valid postal code found, fallback";
        $notification['to'] = $defaultaddress;
        return $notification;
    }
}

Answer 1

你的foreach将会逐步浏览多个记录，因此有些记录会匹配，而有些记录则不会。拥有else return的东西将停止执行foreach，因此第一个不匹配的记录将停止循环而不评估所有其余条目。

如果数组中的任何地方匹配，您似乎想要return $notification;，所以将else逻辑移到之外foreach：

foreach ($districts['district'] as $district) { if (in_array($searchvalue, $district['postalcodes'])) { //Search for known Postal Code $emails[] = $district['email']; //Assign new mail address $notification['to'] = implode("",$emails); //Continue sending email return $notification; //this succeeds without the else below. When the Else is uncommented, this is not executed. } } //No known postal code found, fallback echo "no valid postal code found, fallback"; $notification['to'] = $defaultaddress; return $notification;

（旁注：您可能想要考虑如果多个记录匹配会发生什么。现在，只有第一个匹配的记录会收到一封电子邮件 - 其余的将被忽略.A {{1根据您的目标和数据，可能不是理想的操作。）

PHP if / else总是转向其他，即使IF成功

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