php - 爆炸，数组和每个问题
问题描述
我对以下代码有一些问题；我有一个选择，可以选择多个选项，然后以列表格式输入到数据库中，然后当我需要交叉引用时将它们转换为数组，如果它们被选中以获得帮助我已经包含了var_dump两者$countryList和$DBcountries区域我有问题是
foreach ($DBcountries as $country)此 foreach 语句似乎无法正常工作。
检查下面的$countryList和$DBcountries; 谢谢。
我遇到的问题是，目前它没有选择存储在数据库中的所有选定选项。
<?php
$countryList = file('/var/www/vhosts/example.co.uk/httpdocs/user/tools/countries.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
$options = '';
$DBcountries = $fetch['locations'];
$DBcountries = explode(', ', $DBcountries);
foreach ($countryList as $country) {
foreach ($DBcountries as $cross){
if($cross == $country){
$selected = 'selected';
}else{
$selected = '';
}
}
if($DBcountries == 'All'){
$all = 'selected';
}
$options .= '<option value="'.$country.'" ' . $selected . '>'.$country.'</option>';
}
$select = '<select class="form-select" oninput="locationOutputUpdate(value)" id="country" name="location" multiple aria-label="multiple select example"><option ' . $all . ' >All</option>'.$options.'</select>';
echo $select;
?>
的转储$DBcountries；
array(2) {
[0]=>
string(11) "Afghanistan"
[1]=>
string(7) "Albania"
}
的转储$countryList；
array(196) {
[0]=>
string(11) "Afghanistan"
[1]=>
string(7) "Albania"
[2]=>
string(7) "Algeria"
[3]=>
string(7) "Andorra"
[4]=>
string(6) "Angola"
[5]=>
string(14) "Antigua & Deps"
[6]=>
string(9) "Argentina"
[7]=>
string(7) "Armenia"
[8]=>
string(9) "Australia"
[9]=>
string(7) "Austria"
[10]=>
string(10) "Azerbaijan"
[11]=>
string(7) "Bahamas"
[12]=>
string(7) "Bahrain"
[13]=>
string(10) "Bangladesh"
[14]=>
string(8) "Barbados"
[15]=>
string(7) "Belarus"
[16]=>
string(7) "Belgium"
[17]=>
string(6) "Belize"
[18]=>
string(5) "Benin"
[19]=>
string(6) "Bhutan"
[20]=>
string(7) "Bolivia"
[21]=>
string(18) "Bosnia Herzegovina"
[22]=>
string(8) "Botswana"
[23]=>
string(6) "Brazil"
[24]=>
string(6) "Brunei"
[25]=>
string(8) "Bulgaria"
[26]=>
string(7) "Burkina"
[27]=>
string(7) "Burundi"
[28]=>
string(8) "Cambodia"
[29]=>
string(8) "Cameroon"
[30]=>
string(6) "Canada"
[31]=>
string(10) "Cape Verde"
[32]=>
string(19) "Central African Rep"
[33]=>
string(4) "Chad"
[34]=>
string(5) "Chile"
[35]=>
string(5) "China"
[36]=>
string(8) "Colombia"
[37]=>
string(7) "Comoros"
[38]=>
string(5) "Congo"
[39]=>
string(22) "Congo {Democratic Rep}"
[40]=>
string(10) "Costa Rica"
[41]=>
string(7) "Croatia"
[42]=>
string(4) "Cuba"
[43]=>
string(6) "Cyprus"
[44]=>
string(14) "Czech Republic"
[45]=>
string(7) "Denmark"
[46]=>
string(8) "Djibouti"
[47]=>
string(8) "Dominica"
[48]=>
string(18) "Dominican Republic"
[49]=>
string(10) "East Timor"
[50]=>
string(7) "Ecuador"
[51]=>
string(5) "Egypt"
[52]=>
string(11) "El Salvador"
[53]=>
string(17) "Equatorial Guinea"
[54]=>
string(7) "Eritrea"
[55]=>
string(7) "Estonia"
[56]=>
string(8) "Ethiopia"
[57]=>
string(4) "Fiji"
[58]=>
string(7) "Finland"
[59]=>
string(6) "France"
[60]=>
string(5) "Gabon"
[61]=>
string(6) "Gambia"
[62]=>
string(7) "Georgia"
[63]=>
string(7) "Germany"
[64]=>
string(5) "Ghana"
[65]=>
string(6) "Greece"
[66]=>
string(7) "Grenada"
[67]=>
string(9) "Guatemala"
[68]=>
string(6) "Guinea"
[69]=>
string(13) "Guinea-Bissau"
[70]=>
string(6) "Guyana"
[71]=>
string(5) "Haiti"
[72]=>
string(8) "Honduras"
[73]=>
string(7) "Hungary"
[74]=>
string(7) "Iceland"
[75]=>
string(5) "India"
[76]=>
string(9) "Indonesia"
[77]=>
string(4) "Iran"
[78]=>
string(4) "Iraq"
[79]=>
string(18) "Ireland {Republic}"
[80]=>
string(6) "Israel"
[81]=>
string(5) "Italy"
[82]=>
string(11) "Ivory Coast"
[83]=>
string(7) "Jamaica"
[84]=>
string(5) "Japan"
[85]=>
string(6) "Jordan"
[86]=>
string(10) "Kazakhstan"
[87]=>
string(5) "Kenya"
[88]=>
string(8) "Kiribati"
[89]=>
string(11) "Korea North"
[90]=>
string(11) "Korea South"
[91]=>
string(6) "Kosovo"
[92]=>
string(6) "Kuwait"
[93]=>
string(10) "Kyrgyzstan"
[94]=>
string(4) "Laos"
[95]=>
string(6) "Latvia"
[96]=>
string(7) "Lebanon"
[97]=>
string(7) "Lesotho"
[98]=>
string(7) "Liberia"
[99]=>
string(5) "Libya"
[100]=>
string(13) "Liechtenstein"
[101]=>
string(9) "Lithuania"
[102]=>
string(10) "Luxembourg"
[103]=>
string(9) "Macedonia"
[104]=>
string(10) "Madagascar"
[105]=>
string(6) "Malawi"
[106]=>
string(8) "Malaysia"
[107]=>
string(8) "Maldives"
[108]=>
string(4) "Mali"
[109]=>
string(5) "Malta"
[110]=>
string(16) "Marshall Islands"
[111]=>
string(10) "Mauritania"
[112]=>
string(9) "Mauritius"
[113]=>
string(6) "Mexico"
[114]=>
string(10) "Micronesia"
[115]=>
string(7) "Moldova"
[116]=>
string(6) "Monaco"
[117]=>
string(8) "Mongolia"
[118]=>
string(10) "Montenegro"
[119]=>
string(7) "Morocco"
[120]=>
string(10) "Mozambique"
[121]=>
string(16) "Myanmar, {Burma}"
[122]=>
string(7) "Namibia"
[123]=>
string(5) "Nauru"
[124]=>
string(5) "Nepal"
[125]=>
string(11) "Netherlands"
[126]=>
string(11) "New Zealand"
[127]=>
string(9) "Nicaragua"
[128]=>
string(5) "Niger"
[129]=>
string(7) "Nigeria"
[130]=>
string(6) "Norway"
[131]=>
string(4) "Oman"
[132]=>
string(8) "Pakistan"
[133]=>
string(5) "Palau"
[134]=>
string(6) "Panama"
[135]=>
string(16) "Papua New Guinea"
[136]=>
string(8) "Paraguay"
[137]=>
string(4) "Peru"
[138]=>
string(11) "Philippines"
[139]=>
string(6) "Poland"
[140]=>
string(8) "Portugal"
[141]=>
string(5) "Qatar"
[142]=>
string(7) "Romania"
[143]=>
string(18) "Russian Federation"
[144]=>
string(6) "Rwanda"
[145]=>
string(16) "St Kitts & Nevis"
[146]=>
string(8) "St Lucia"
[147]=>
string(30) "Saint Vincent & the Grenadines"
[148]=>
string(5) "Samoa"
[149]=>
string(10) "San Marino"
[150]=>
string(19) "Sao Tome & Principe"
[151]=>
string(12) "Saudi Arabia"
[152]=>
string(7) "Senegal"
[153]=>
string(6) "Serbia"
[154]=>
string(10) "Seychelles"
[155]=>
string(12) "Sierra Leone"
[156]=>
string(9) "Singapore"
[157]=>
string(8) "Slovakia"
[158]=>
string(8) "Slovenia"
[159]=>
string(15) "Solomon Islands"
[160]=>
string(7) "Somalia"
[161]=>
string(12) "South Africa"
[162]=>
string(11) "South Sudan"
[163]=>
string(5) "Spain"
[164]=>
string(9) "Sri Lanka"
[165]=>
string(5) "Sudan"
[166]=>
string(8) "Suriname"
[167]=>
string(9) "Swaziland"
[168]=>
string(6) "Sweden"
[169]=>
string(11) "Switzerland"
[170]=>
string(5) "Syria"
[171]=>
string(6) "Taiwan"
[172]=>
string(10) "Tajikistan"
[173]=>
string(8) "Tanzania"
[174]=>
string(8) "Thailand"
[175]=>
string(4) "Togo"
[176]=>
string(5) "Tonga"
[177]=>
string(17) "Trinidad & Tobago"
[178]=>
string(7) "Tunisia"
[179]=>
string(6) "Turkey"
[180]=>
string(12) "Turkmenistan"
[181]=>
string(6) "Tuvalu"
[182]=>
string(6) "Uganda"
[183]=>
string(7) "Ukraine"
[184]=>
string(20) "United Arab Emirates"
[185]=>
string(14) "United Kingdom"
[186]=>
string(13) "United States"
[187]=>
string(7) "Uruguay"
[188]=>
string(10) "Uzbekistan"
[189]=>
string(7) "Vanuatu"
[190]=>
string(12) "Vatican City"
[191]=>
string(9) "Venezuela"
[192]=>
string(7) "Vietnam"
[193]=>
string(5) "Yemen"
[194]=>
string(6) "Zambia"
[195]=>
string(8) "Zimbabwe"
}
解决方案
尝试替换此位：
foreach ($DBcountries as $cross){
if($cross == $country){
$selected = 'selected';
}else{
$selected = '';
}
}
这样：
foreach ($DBcountries as $cross){
$selected = '';
if($cross == $country) {
$selected = 'selected';
}
}
这样就应该选择所有国家。原因是即使你设置了一个国家，selected你也会在循环的下一次迭代中再次覆盖它。
更有效的是：
foreach ($DBcountries as $cross){
$selected = '';
if($cross == $country) {
$selected = 'selected';
break;
}
}
找到国家后跳出循环。但更短的是：
$selected = in_array($country, $DBcountries) ? 'selected' : '';
是的，这就是替换该循环所需的全部内容。