我有一个奇怪的问题，我的PHP / JSON数据是由PHP返回的。这是我的PHP：
<?php
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Easy set variables
*/
/* Array of database columns which should be read and sent back to DataTables. Use a space where
* you want to insert a non-database field (for example a counter or static image)
*/
// add your columns here!!!
$aColumns = array( 'Action', 'TimeOccurred', 'UserName', 'IPv4From', 'ShareName', 'FullFilePath', 'NewPathName', 'FromServer' );
//$aColumns = $_POST['selcolumns'];
//$aColumns = explode("-", $aColumns);
foreach ($aColumns as $col) {
file_put_contents( '../php/php-debug.txt', $col." ", FILE_APPEND );
}
$server = "";
$database = array("Database" => "");
$conn = sqlsrv_connect($server, $database);
if ($conn === false) die("<pre>".print_r(sqlsrv_errors(), true));
/* Indexed column (used for fast and accurate table cardinality) */
$sIndexColumn = "GUID";
/* DB table to use */
$sTable = $_POST['table'];
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* If you just want to use the basic configuration for DataTables with PHP server-side, there is
* no need to edit below this line
*/
/*
* Local functions
*/
function fatal_error ( $sErrorMessage = '' ) {
header( $_SERVER['SERVER_PROTOCOL'] .' 500 Internal Server Error' );
die( $sErrorMessage );
}
/* Ordering */
$sOrder = "";
if ( isset( $_POST['order'] ) ) {
$sOrder = "ORDER BY ";
if ( $_POST['columns'][0]['orderable'] == "true" ) {
$sOrder .= "".$aColumns[ intval( $_POST['order'][0]['column'] ) ]." ".
($_POST['order'][0]['dir']==='asc' ? 'asc' : 'desc');
}
}
/* escape function */
function mssql_escape($data) {
if(is_numeric($data))
return $data;
$unpacked = unpack('H*hex', $data);
return '0x' . $unpacked['hex'];
}
/* Filtering */
$sWhere = "";
if ( isset($_POST['search']['value']) && $_POST['search']['value'] != "" ) {
$sWhere = "WHERE (";
for ( $i=0 ; $i<count($aColumns) ; $i++ ) {
$sWhere .= $aColumns[$i]." LIKE '%".addslashes( $_POST['search']['value'] )."%' OR ";
}
$sWhere = substr_replace( $sWhere, "", -3 );
$sWhere .= ')';
}
/* Individual column filtering */
for ( $i=0 ; $i<count($aColumns) ; $i++ ) {
if ( isset($_POST['columns'][$i]) && $_POST['columns'][$i]['searchable'] == "true" && $_POST['columns'][$i]['search']['value'] != '' ) {
if ( $sWhere == "" ) {
$sWhere = "WHERE ";
}
else {
$sWhere .= " AND ";
}
$sWhere .= $aColumns[$i]." LIKE '%".addslashes($_POST['columns'][$i]['search']['value'])."%' ";
}
}
/* Add the custom Date/Time filter */
if ( $sWhere == "" ) {
$sWhere = "WHERE (TimeOccurred >= "."'".$_POST['datestart']."'"." AND TimeOccurred <= "."'".$_POST['dateend']."')";
}
else {
$sWhere .= " AND (TimeOccurred >= "."'".$_POST['datestart']."'"." AND TimeOccurred <= "."'".$_POST['dateend']."')";
}
/* Paging */
$top = (isset($_POST['start']))?((int)$_POST['start']):0 ;
$limit = (isset($_POST['length']))?((int)$_POST['length'] ):5;
$sQuery = "SELECT TOP $limit ".implode(', ', $aColumns)." FROM $sTable $sWhere ".(($sWhere=="")?" WHERE ":" AND ")." $sIndexColumn NOT IN ( SELECT TOP $top $sIndexColumn FROM $sTable $sOrder ) $sOrder";
$rResult = sqlsrv_query($conn, $sQuery);
if($rResult === false){
die(sqlsrv_errors(SQLSRV_ERR_ERRORS));
}
/* Data set length after filtering */
$sQueryCnt = "SELECT * FROM $sTable $sWhere";
$rResultCnt = sqlsrv_query($conn, $sQueryCnt, array(), array("Scrollable" => SQLSRV_CURSOR_KEYSET));
$iFilteredTotal = sqlsrv_num_rows( $rResultCnt );
/* Total data set length */
$sQuery = "SELECT COUNT(GUID) FROM $sTable";
$rResultTotal = sqlsrv_query($conn, $sQuery, array(), array("Scrollable" => SQLSRV_CURSOR_KEYSET));
$aResultTotal = sqlsrv_fetch_array($rResultTotal, SQLSRV_FETCH_NUMERIC);
$iTotal = $aResultTotal[0];
/* Output */
$output = array(
"draw" => intval($_POST['draw']),
"recordsTotal" => $iTotal,
"recordsFiltered" => $iFilteredTotal,
"data" => array()
);
while ( $aRow = sqlsrv_fetch_array( $rResult, SQLSRV_FETCH_ASSOC) ) {
$row = array();
for ( $i=0 ; $i<count($aColumns) ; $i++ ) {
$row[$aColumns[$i]] = $aRow[ $aColumns[$i] ];
}
$output['data'][] = $row;
}
echo json_encode( $output );
?>
让我陷入困境的代码部分：
$aColumns = array( 'Action', 'TimeOccurred', 'UserName', 'IPv4From', 'ShareName', 'FullFilePath', 'NewPathName', 'FromServer' );
//$aColumns = $_POST['selcolumns'];
//$aColumns = explode("-", $aColumns);
foreach ($aColumns as $col) {
file_put_contents( '../php/php-debug.txt', $col." ", FILE_APPEND );
}
如果我按原样保留我的代码并运行整个过程，我会按预期恢复数据并且一切正常。我也在我的php-debug.txt中获得了这个输出：
操作TimeOccurred UserName IPv4From ShareName FullFilePath NewPathName FromServer
如果我将这些代码行修改为：
//$aColumns = array( 'Action', 'TimeOccurred', 'UserName', 'IPv4From', 'ShareName', 'FullFilePath', 'NewPathName', 'FromServer' );
$aColumns = $_POST['selcolumns'];
$aColumns = explode("-", $aColumns);
foreach ($aColumns as $col) {
file_put_contents( '../php/php-debug.txt', $col." ", FILE_APPEND );
}
我没有按预期收回数据。我收到一条警告，声明无效的JSON响应，在我的php-debug.txt中，我得到了这样的内容：
操作TimeOccurred UserName IPv4From ShareName FullFilePath NewPathName FromServer
让我疯狂的是阵列具有相同的值，但它不起作用。第二次在php-debug.txt的末尾有一个额外的空间，不知道它来自哪里或是否是问题。
希望有人能指出我正确的方向。
答案 0 :(得分：0)
我弄明白了这个问题。由于某种原因，我的数组中添加了一个额外的元素，但它是一个空元素，因此当我打印时，那里什么都没有。我把它添加到我的代码array_pop（$ aColumns）;而现在，这解决了问题。虽然它是一种肮脏的锻炼，但我不禁想到最终会出现一个场景，即最后一个元素不是空白而且是我需要的东西。很想找出更清洁的解决方案。