我有一个Android应用程序，它使用StringRequest来记录用户。我最近更改了一些PHP代码，它现在返回服务器错误500.（我知道错误意味着什么）不幸的是，我找不到错误
我的PHP代码：
<?php
require("password.php");
$con = mysqli_connect("mywebsite.com", "username", "password", "dbname");
$username = $_POST["username"];
$password = $_POST["password"];
$statement = mysqli_prepare($con, "SELECT * FROM user WHERE username = ?");
mysqli_stmt_bind_param($statement, "s", $username);
mysqli_stmt_execute($statement);
mysqli_stmt_store_result($statement);
mysqli_stmt_bind_result($statement, $colUserID, $colName, $colUsername, $colTheme, $colEmail, $colDefaultRadius, $colPassword, $timeElapsed1, $timeElapsed2, $timeElapsed3, $timeElapsed4, $timeElapsed5, $timeElapsed6, $timeElapsed7);
$response = array();
$response["success"] = false;
while(mysqli_stmt_fetch($statement)){
if (password_verify($password, $colPassword)) {
$response["success"] = true;
$response["name"] = $colName;
$response["user_id"] = $colUserID;
$response["theme"] = $colTheme;
$response["email"] = $colEmail;
$response["radius"] = $colDefaultRadius;
$response["timeElapsed1"] = $timeElapsed1;
$response["timeElapsed2"] = $timeElapsed2;
$response["timeElapsed3"] = $timeElapsed3;
$response["timeElapsed4"] = $timeElapsed4;
$response["timeElapsed5"] = $timeElapsed5;
$response["timeElapsed6"] = $timeElapsed6;
$response["timeElapsed7"] = $timeElapsed7;
}
}
mysqli_stmt_close($statement);
$statement2 = mysqli_prepare($con, "SELECT * FROM location WHERE username = ?");
mysqli_stmt_bind_param($statement2, "s", $username);
mysqli_stmt_execute($statement2);
mysqli_stmt_store_result($statement2);
mysqli_stmt_bind_result($statement2, $colUsername, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32, $33, $34, $35, $36, $37, $38, $39, $40, $41, $42, $43, $44, $45, $46, $47, $48, $49);
while(mysqli_stmt_fetch($statement2)) {
if($response["success"] == true) {
$response["1"] = $1;
$response["2"] = $2;
$response["3"] = $3;
$response["4"] = $4;
$response["5"] = $5;
$response["6"] = $6;
$response["7"] = $7;
$response["8"] = $8;
$response["9"] = $9;
$response["10"] = $10;
$response["11"] = $11;
$response["12"] = $12;
$response["13"] = $13;
$response["14"] = $14;
$response["15"] = $15;
$response["16"] = $16;
$response["17"] = $17;
$response["18"] = $18;
$response["19"] = $19;
$response["20"] = $20;
$response["21"] = $21;
$response["22"] = $22;
$response["23"] = $23;
$response["24"] = $24;
$response["25"] = $25;
$response["26"] = $26;
$response["27"] = $27;
$response["28"] = $28;
$response["29"] = $29;
$response["30"] = $30;
$response["31"] = $31;
$response["32"] = $32;
$response["33"] = $33;
$response["34"] = $34;
$response["35"] = $35;
$response["36"] = $36;
$response["37"] = $37;
$response["38"] = $38;
$response["39"] = $39;
$response["40"] = $40;
$response["41"] = $41;
$response["42"] = $42;
$response["43"] = $43;
$response["44"] = $44;
$response["45"] = $45;
$response["46"] = $46;
$response["47"] = $47;
$response["48"] = $48;
$response["49"] = $49;
}
}
echo json_encode($response);
?>
请注意，我知道错误发生在$statement2声明中。我尝试了几件事，但无法修复错误。 $1到$49链接到数据库中的varchars。谁能告诉我发生了什么？我尝试过使用Volley Response.ErrorListener并且它最终没有显示任何内容。在此先感谢您的帮助！
答案 0 :(得分：2)
PHP Docs州：
有效的变量名称以字母或下划线开头，后跟 任意数量的字母，数字或下划线。
所以$1，$2等在PHP中不是有效的变量名。
要查找实际的错误原因和位置，您还可以检查服务器错误日志的内容（如果可用）（并且PHP配置正确;配置参数error_log必须设置为true）
另外一个提示是在分配绑定结果时使用动态变量名称，因此您可以在循环中分配它们：
而不是
$response["timeElapsed1"] = $timeElapsed1;
$response["timeElapsed2"] = $timeElapsed2;
// and so on
你可以使用
foreach (range(1, 7) as $num) {
$var = 'timeElapsed'.$num;
$response['timeElapsed'.$num] = $$var;
}
更紧凑（但更好地评论它，因为它不容易发现）。
答案 1 :(得分：1)
现在允许使用以数字开头的变量名称。也许这就是错误，因为你有很多这样的错误。我建议将它们重命名为$val1，依此类推。
答案 2 :(得分：1)
您绑定的数字变量不合适。更改这些变量可能会影响您的代码...这里是您的代码，变量已更改为使用英文字母：
<?php
require("password.php");
$con = mysqli_connect("mywebsite.com", "username", "password", "dbname");
$username = $_POST["username"];
$password = $_POST["password"];
$statement = mysqli_prepare($con, "SELECT * FROM user WHERE username = ?");
mysqli_stmt_bind_param($statement, "s", $username);
mysqli_stmt_execute($statement);
mysqli_stmt_store_result($statement);
mysqli_stmt_bind_result($statement, $colUserID, $colName, $colUsername, $colTheme, $colEmail, $colDefaultRadius, $colPassword, $timeElapsed1, $timeElapsed2, $timeElapsed3, $timeElapsed4, $timeElapsed5, $timeElapsed6, $timeElapsed7);
$response = array();
$response["success"] = false;
while(mysqli_stmt_fetch($statement)){
if (password_verify($password, $colPassword)) {
$response["success"] = true;
$response["name"] = $colName;
$response["user_id"] = $colUserID;
$response["theme"] = $colTheme;
$response["email"] = $colEmail;
$response["radius"] = $colDefaultRadius;
$response["timeElapsed1"] = $timeElapsed1;
$response["timeElapsed2"] = $timeElapsed2;
$response["timeElapsed3"] = $timeElapsed3;
$response["timeElapsed4"] = $timeElapsed4;
$response["timeElapsed5"] = $timeElapsed5;
$response["timeElapsed6"] = $timeElapsed6;
$response["timeElapsed7"] = $timeElapsed7;
}
}
mysqli_stmt_close($statement);
$statement2 = mysqli_prepare($con, "SELECT * FROM location WHERE username = ?");
mysqli_stmt_bind_param($statement2, "s", $username);
mysqli_stmt_execute($statement2);
mysqli_stmt_store_result($statement2);
mysqli_stmt_bind_result($statement2, $colUsername, $a, $b, $c, $d, $e, $f, $g, $h, $i, $j, $k, $l, $m, $n, $o, $p, $q, $r, $s, $t, $u, $v, $w, $x, $y, $z, $aa, $ab, $ac, $ad, $ae, $af, $ag, $ah, $ai, $aj, $ak, $al, $am, $an, $ao, $ap, $aq, $ar, $as, $at, $au, $av, $aw);
while(mysqli_stmt_fetch($statement2)) {
if($response["success"] == true) {
$response["1"] = $a;
$response["2"] = $b;
$response["3"] = $c;
$response["4"] = $d;
$response["5"] = $e;
$response["6"] = $f;
$response["7"] = $f;
$response["8"] = $h;
$response["9"] = $i;
$response["10"] = $j;
$response["11"] = $k;
$response["12"] = $l;
$response["13"] = $m;
$response["14"] = $n;
$response["15"] = $o;
$response["16"] = $p;
$response["17"] = $q;
$response["18"] = $r;
$response["19"] = $s;
$response["20"] = $t;
$response["21"] = $u;
$response["22"] = $v;
$response["23"] = $w;
$response["24"] = $x;
$response["25"] = $y;
$response["26"] = $z;
$response["27"] = $aa;
$response["28"] = $ab;
$response["29"] = $ac;
$response["30"] = $ad;
$response["31"] = $ae;
$response["32"] = $af;
$response["33"] = $ag;
$response["34"] = $ah;
$response["35"] = $ai;
$response["36"] = $aj;
$response["37"] = $ak;
$response["38"] = $al;
$response["39"] = $am;
$response["40"] = $an;
$response["41"] = $ao;
$response["42"] = $ap;
$response["43"] = $aq;
$response["44"] = $ar;
$response["45"] = $as;
$response["46"] = $at;
$response["47"] = $au;
$response["48"] = $av;
$response["49"] = $aw;
}
}
echo json_encode($response);
?>
答案 3 :(得分：1)
错误在变量中。您不能拥有以数字开头的变量。尝试在前面添加一个简单的下划线或小写字母，例如a1-a49。