if statement using isset当数组中没有任何内容时,我正在尝试创建一个 which 过滤器。该数组大致包含 [0]-[16] 个变量,有时 [11] 有时什么也不包含。当我回声echo $car['Images'][0]['ImageURI'];如果 JSON 中有一个变量,它将返回:https://vehiclestock-public.pinnacledms.net/ViewVehiclePhoto.aspx?BUID=a3db2a66-b4fb-4ac2-a78a-0f042aab50af&VUID=8be4d43d-e3a4-e611-80cf-0a94ef0355af&Rank=1&Width=960如果里面什么都没有,那么我检索:Notice: Undefined offset: 0 in /customers/8/9/9/testsite.agency/httpd.www/api/wp-content/themes/divi-child/functions.php on line 94我希望它能够确定内部是否没有任何内容继续,没有错误/通知。我的代码:// Response = to JSON decode this allows us to decode the large response $response = json_decode($json_data, true); // Using a foreach to access Nested Array foreach($response as $index => $car) { $car['BasicPrice']; $car['BodyStyle']['BodyStyle']; $car['Colour']; $car['EngineNumber']; $car['EngineSize']; $car['FuelType']['FuelType']; $car['HasServiceHistory']; // To access the images we have to access a nested array within a nested array. // This if statement stops the code reading empty car array and throwing an Undefined Index: 0 if( isset($car['Images']) ) { //it exists echo $car['Images'][0]['ImageURI']; echo $car['Images'][1]['ImageURI']; echo $car['Images'][2]['ImageURI']; echo $car['Images'][3]['ImageURI']; echo $car['Images'][4]['ImageURI']; echo $car['Images'][5]['ImageURI']; echo $car['Images'][6]['ImageURI']; echo $car['Images'][7]['ImageURI']; echo $car['Images'][8]['ImageURI']; } }
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你可以检查数组键是否存在
if(array_key_exists(0,$car['Images'])) {
do stuff
}else{
continue;
}
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