将foreach外部的变量与if语句一起使用 - Using a variable outside foreach with if statement?

Using a variable outside foreach with if statement?

这段代码应该能解释所有内容。。

foreach($this->sections as $k => $section){ 
    $preview = array();
    foreach ($section['fields'] as $k => $type) {                               
       $preview[] = $type['type'];
    }
    if ($preview == 'header_preview'){
        echo $preview;
        // I will loop content here based on the $section loop NOT the $type loop
    }
}

我只需要得到每个$section['fields']，然后在循环之外，它再次得到所有$section['fields']的列表，然后使用其中一个字段类型来创建if语句。以上是不工作的，我将在这里向您展示工作代码。

foreach($this->sections as $k => $section){ 
    foreach ($section['fields'] as $k => $type) {                               
        if ($type['type'] == 'header_preview'){
           //I work but im in a nested loop I need out
        }
     }
  //The main loop here.. the above loop is just to setup data to use inside this loop? Make sense? I hope!
}

我希望这是有道理的。。。

var_dump $this->sections 的代码段

array(26) { ["general"]=> array(3) { ["title"]=> string(7) "General" ["icon"]=>    string(106) "img/icons/sub.png" ["fields"]=> array(5) { [0]=> array(6) { ["id"]=>    string(10) "responsive" ["type"]=> string(6) "switch" ["title"]=> string(35) "Responsive" ["desc"]=> string(10) "Responsive" ["options"]=> array(2) { [1]=> string(2) "On"    [0]=> string(3) "Off" }

可能$k已经重复，因此循环不知道该怎么办。您可以尝试将$k更改为$x，看看它是否有效。

foreach($this->sections as $k => $section){ 
    $preview = array();
    foreach ($section['fields'] as $x => $type) {                               
       $preview[] = $type['type'];
    }
    foreach($preview as $elem){
        if ($elem == 'header_preview'){
            echo($elem);
        }
    }
}

嗯。。。也许

foreach($this->sections as $k => $section){ 
    $preview = array();
    foreach ($section['fields'] as $x => $type) {                               
       $preview[] = $type['type'];
    }
    if(!in_array('header_preview', $preview)){
        // Here $preview DOES NOT contain 'header_preview'
        // Do stuff
    } 
}

$header_preview=false;
foreach($this->sections as $k => $section){ 
    $header_preview=false;// reset the var $header_preview
    foreach ($section['fields'] as $k => $type) {                               
        if ($type['type'] == 'header_preview') $header_preview = true;
    }
    if($header_preview==true){
        //here you can add or extract from this array that has `header_preview` value for one of it's field type
    }
}