PHP foreach循环警告非法字符串偏移

Question

我有一个简单的循环问题。 我有这样的数据：

var express = require('express');
var bodyParser = require('body-parser');
var Request = require("request");

var app = express();
app.use(bodyParser.json());

app.post('/building/', function (req, res) {
	'use strict';

	var myObject = null;

	var callSiteApi = {
		uri: 'http://localhost:8080/site/',
		body: JSON.stringify(req.body),
		method: 'POST',
		headers: {
			'Content-Type': 'application/json'
		}
	}
	// First External API Call
	Request(callSiteApi, function (error, response) {
		if (error) {
			console.log('ERROR with user request.');
			return response.sendStatus(500); // Return back that an error occurred
		} else {
			// Get data from response.body

    
			var materialquerystring = "mat="+response.body.material+"&date="+response.body.date;
            var floor = response.body.floor;

			for (var i = 0; i < floor.length; i++) {

				matereialValueURL = "http://localhost:8080/material/q="+materialquerystring;
				// Second External API Call within for loop
				Request.get(materialValueURL, (error, response, body) => {
					if (error) {
						console.log(req.error);
						
					}
					materialObject = JSON.parse(body);
          var valuequerystring = "value="+materialObject.value;
          // do somehting with materialObject
          
					console.log("first request iteration =" + i);

					sitevalueURL = "http://localhost:8080/value/q="+valuequerystring;
					// Third External API Call within for loop
					Request.get(sitevalueURL, (error, response, body) => {
						if (error) {
							logger.debug('[' + pid + '] ' + req.error);
							//return console.dir(error);
						}
						valueObject = JSON.parse(body);           
            console.log("second request iteration =" + i);
            // do somehting with valueObject 7 materialObject
            var a = materialObject.a;
            var b = valueObject.b;
            var c = a+b;
            
						
					});
				});
			}

			res.writeHead(200, {
				'Content-Type': 'application/json'
			});
			res.end('{"value-1":"a","value-2":"b","value-3":"c","material":"materialquerystring","value":"valuequerystring"}');
		}
	});
});

我需要创建一个像这样的新表：

$PRODUCT = [

'title' => 'Blouse',
'lines' => [

    'variants' => [
        [
            'price' => 112.34,
            'options' => [
                'size' => 'small',
                'color' => 'yellow',

            ]
        ],
        [
            'price' => 156.33,
            'options' => [
                'size' => 'small',
                'color' => 'blue',

            ]
        ],
    ],
  ]

我试图在循环中只获取键为$options => [ 'size', 'color' ] 的数组，我什至拥有所需的数据，但是我有警告：

'options'

我的循环如下：

Warning: Illegal string offset 'options'

我的错误在哪里？我知道$options = []; foreach ($PRODUCT['lines'] as $variant){ foreach ($variant as $item) { $options[] = $item['options']; } } 不是数组，但是在这种情况下没有警告怎么办？

Answer 1

您错过了阵列中的一个关卡。试试这个：

$options = [];

foreach ($PRODUCT['lines']['variants'] as $variant){
    foreach ($variant as $item) {
      $options[] = $item['options'];
    }
 }

Answer 2

您可以使用array_column。

$options = array_column($PRODUCT['lines']['variants'], 'options');
var_dump($options);

Array_column将获取所有名为'options'的数组项，并将其保存到$ options变量中。

https://3v4l.org/bJKX4