Question

在http://php.net/manual/en/control-polis.foreach.php” rel=“nofollow”article,其中提到:

<><>>>>><>>>><>>>>><>>>>> 不能支持用@ 压制错误信息的能力。

我如何避免产出<代码>foreach误差? 我不想看到:

<>Warning:Invalid case provided for foreach()

Is there a way to make an if else judgement?

Answer 1

Before foreach check if variable contain array:

if (is_array($var))
{
   foreach...
}

Answer 2

prefix the variable with a (array) like this.

foreach( (array) $array_thats_not_an_array as $key => $value ){
    echo $key .     . $value;
}

Answer 3

if(!empty($array)) {
  foreach($array as $a) {
    // do something
  }
}

Answer 4

我使用了OZ的建议,但在is_array测试上留下了一个错误。

但是,在待测试的阵列名称之前添加“@。

    if (is_array((@$errors))){
      foreach ($errors as $error): ?>
        <?php echo $error; ?>
        <br/>
      <?php endforeach;
    }

and yes I know using @ is shoddy BUT I cannot get a tiny bit of inherited code working prettily. I can either spend another hour to fix that to get round a "your var is not defined" or stick a @ in and get the other things needed for a very ALFA version to share with a friend tomorrow. Oh and yes 11 pm and my brain is befuddled!

ATB Mr Grumpy
PS Big thanks to OZ_ for 95% of the solution!

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