当数组来自 mysql_fetch_array 时显示 php 中的数组差异

Question

我正在设计一个 php 脚本，它显示特定旅行社在给定日期的可用巴士。这是 php 代码片段。

$query1 = mysql_query("SELECT bus_id FROM schedule WHERE travel_agency_id = '".$travel_agency_id."' AND scheduleddate ='".$busDate."'");
$query2 = mysql_query("SELECT bus_id FROM pc WHERE travel_agency_id = '".$travel_agency_id."' ");

$array1 = array(@mysql_fetch_array($query1));
$array2 = array(@mysql_fetch_array($query2));
$diff = array_diff($array2, $array1);
print_r ($diff);

我认为上面的查询会在给定日期"$busDate" 打印旅行社ID "$travel_agency_id" 的"bus_id"s。但是出现如下错误。

Notice: Array to string conversion in.......... Array ( [0] => )

谁能解释为什么会发生这个错误..？如何使用 "echo" 显示可用总线数组 (id)？

Answer 1

试试这个..

    $query1 = mysql_query("SELECT bus_id FROM schedule WHERE travel_agency_id = '".$travel_agency_id."' AND scheduleddate ='".$busDate."'");
    $query2 = mysql_query("SELECT bus_id FROM pc WHERE travel_agency_id = '".$travel_agency_id."' ");
    if(mysql_num_rows($query1) > 0 && mysql_num_rows($query2) > 0 ){
    $array1 = mysql_fetch_array($query1);
    $array2 = mysql_fetch_array($query2);
    $diff = array_diff($array2, $array1);
    print_r ($diff);
}

当数组来自 mysql_fetch_array 时显示 php 中的数组差异

displaying array difference in php when arrays coming from mysql_fetch_array

php

mysql

array-difference