PHP array_keys - 我做错了什么？

Question

我有两个数组:

$字段名:

array(
[0] => array(
    ['fieldName'] =>'id'
    ['fieldType'] => 'int(11)'
    )
[1] =>
    ['fieldName'] =>'adminID'
    ['fieldType'] =>'int(11)'
    )
[2] =>array(
    ['fieldName'] =>'schoolID'
    ['fieldType'] =>'int(11)'
    )
[3] => array(
    ['fieldName'] =>'lessonPlanName'
    ['fieldType'] =>'varchar(255)'
    )
[4] =>array(
    ['fieldName'] =>'lessonPlanAssignmentDate'
    ['fieldType'] =>'varchar(255)'
    )
[5] =>array(
   ['fieldName'] =>'lessonPlanDueDate'
   ['fieldType'] =>'varchar(255)'
   )
[6] =>array(
   ['fieldName'] =>'lessonPlanTopics'
   ['fieldType'] =>'varchar(255)'
   )
[7] =>array(
   ['fieldName'] =>'lessonPlanDescription'
   ['fieldType'] =>'text'
   )
[8] =>array(
   ['fieldName'] =>'lessonPlanNotes'
   ['fieldType'] =>'text'
   )
)

$formElementPairs:

array(
   ['lessonPlanName'] =>'Test'
   ['lessonPlanAssignedDate'] =>'05/11/2011'
   ['lessonPlanDueDate'] =>'05/11/2011'
   ['lessonPlanTopics'] => 1
   ['lessonPlanDescription'] =>'test'

)

我正在尝试检查数组 2 是否缺少数组 1 中的任何“fieldName”键，然后将它们添加到包含空条目的数组 2 中。以下代码的工作原理是我从第一个数组(id、adminId、schoolId 等)中获取“fieldName”值，但是当我使用 array_keys 将它们与第二个数组进行比较时，我得到的数组总是有一个计数0. 还应该提到我在这个项目上一直使用 PHP4。

//merge arrays
for($fn=0; $fn<count($fieldNames); $fn++) { 
    $thisFieldName = $fieldNames[$fn]['fieldName'];
    $fieldCheckArray = array_keys($formElementPairs, $thisFieldName);
    //$firephp->fb(count($fieldCheckArray));
}

我是否误解了 array_keys 和/或在 PHP4 中是否有更优雅的方式来做到这一点？

谢谢

Answer 1

您可以使用 array_key_exists 检查数组 2 是否缺少任何内容:array_key_exists

$missing = array();
for($fn=0; $fn<count($fieldNames); $fn++) { 
    $thisFieldName = $fieldNames[$fn]['fieldName'];
    if(!array_key_exists($thisFieldName, $formElementPairs)) {
        $missing[] = $thisFieldName;
    }
}
//do something with $missing