本文旨在解决PHP中使用while循环从MySQL数据库获取数据时，循环只执行一次就停止的问题。通过分析错误信息和代码逻辑，我们将定位问题根源在于变量名冲突，并提供明确的修改方案，确保循环能够正确处理所有数据行。本文还将介绍如何避免类似错误，提升代码的健壮性和可维护性。
在PHP开发中，使用while循环处理从数据库查询返回的结果集是一种常见的操作。然而，开发者有时会遇到循环只执行一次就意外终止的问题，导致部分数据未能被正确处理。本文将深入探讨此类问题的常见原因，并提供详细的解决方案。
当mysqli_fetch_array()函数抛出“expects parameter 1 to be mysqli_result, string given”的警告时，表明传递给该函数的参数不是预期的MySQL结果集资源，而是一个字符串。这通常意味着在循环内部，原本存储MySQL结果集的变量被意外地覆盖了。
在提供的代码示例中，问题出在以下两段代码：
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$result = mysqli_query($mysqli,$post_query);
...
while($row = mysqli_fetch_array($result)){
...
$result = curl_exec($ch);
...
}变量$result最初被用于存储mysqli_query()返回的MySQL结果集。但在while循环内部，$result又被用于存储curl_exec()返回的cURL请求结果。这导致在第二次循环开始时，mysqli_fetch_array()接收到的$result不再是MySQL结果集资源，而是一个字符串，从而引发了错误并导致循环终止。
解决此问题的关键在于避免变量名冲突。为cURL请求的结果使用一个不同的变量名，例如$curl_result。修改后的代码如下：
$result = mysqli_query($mysqli,$post_query);
...
while($row = mysqli_fetch_array($result)){
...
$curl_result = curl_exec($ch);
...
}通过将cURL请求的结果存储到$curl_result变量中，可以确保$result变量始终保持对MySQL结果集的引用，从而保证mysqli_fetch_array()函数能够正确地从结果集中获取数据，循环也能正常执行。
<?php
ini_set('max_execution_time', '0');
ini_set('max_input_vars', '100000');
ini_set('memory_limit', '-1');
include_once('includes/connection.php');
date_default_timezone_set('Asia/Kolkata');
$current_time = date("Y-m-d H:i:s", time());
$post_query = "SELECT * FROM tbl_posts LEFT JOIN tbl_users ON tbl_posts.post_user = tbl_users.id WHERE post_status = 1 AND post_time < '$current_time'";
echo $post_query;
echo "<br>";
$result = mysqli_query($mysqli,$post_query);
$row_cnt = mysqli_num_rows($result);
if($row_cnt<1){
echo "no data";
exit();
}
$i =0;
while($row = mysqli_fetch_array($result)){
$i++;
$pid = $row['pid'];
echo date("Y-m-d H:i:s", time());
echo "<br>";
$post_user = $row['post_user'];
$title = $row['post_title'];
$language = $row['post_language'];
$hashtags =$row['post_tags'];
$genre = $row['post_category'];
$subGenre = $row['post_sub_category'];
$post_tags = $row['post_tags'];
$image = $row['post_image'];
$dh_user_id = $row['dh_user_id'];
$login_status = $row['login_status'];
$login_expiry = $row['login_expiry'];
$cookie = $row['cookie'];
$mobile = $row['dh_mobile'];
if($login_status!=1 || strtotime($login_expiry) <= time()){
$q = "UPDATE tbl_users SET login_status=0, login_expiry = '00-00-00 00:00:00'";
$r = mysqli_query($mysqli,$q);
//EMAIL TO USER FOR ERROR OF LOGIN
}else{
$dir = "uploads/".$post_user;
$output="";
$variableAry=explode(",",$hashtags); //you have array now
$total = count($variableAry);
foreach($variableAry as $i=>$var)
{
$start = '{"title":"';
$end = '","id":""},';
if(($i+1)==$total){
$end = '","id":""}';
}
$output.=$start.$var.$end;
}
$hashtags = $output;
$userId =$dh_user_id;
$cookie = 'Cookie: '.$cookie;
$img = $dir.'/'.$image;
file_put_contents(time().'.txt',$img);
//:: FIRST STEP :://
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => 'https://example.com/api/image?isFile=true',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_SSL_VERIFYHOST=> 0,
CURLOPT_VERBOSE=> 1,
CURLOPT_SSL_VERIFYPEER => 0,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_POSTFIELDS => array('imageFile'=> new CURLFILE("$img")),
CURLOPT_HTTPHEADER => array(
"'$cookie'"
),
));
$curl_result = curl_exec($curl); // Changed variable name here
if (curl_errno($curl)) {
echo 'Error:' . curl_error($curl);
}
curl_close($curl);
$json = json_decode($curl_result);
$str = explode("#/", $json->fileName)[1];
$height = $json->height;
$width = $json->width;
$str = explode("#/", $json->fileName)[1];
$format = explode(".", $json->fileName)[1];
$height = $height;
$width = $width;
$url =$str;
$format =$format;
$data = '{"post":{"fields":{"icon":{"height":'.$height.',"width":'.$width.',"url":"'.$url.'","id":"'.$url.'","format":"'.$format.'"},"image":{"height":'.$height.',"width":'.$width.',"url":"'.$url.'","id":"'.$url.'","format":"'.$format.'"},"title":"'.$title.'","hashtags":['.$hashtags.']},"locations":[""],"language":"'.$language.'","type":"IMAGE","tags":{"dhTags":{"genre":["'.$genre.'"],"subGenre":["'.$subGenre.'"]}},"ttl":{"id":"2","name":"Infinite","type":"NORMAL","value":"31536000"},"action":"submit","postId":null,"updatePublishedDate":false},"userId":'.$userId.'}';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://example.com/api/post/upsert/update');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "$data");
curl_setopt($ch, CURLOPT_ENCODING, 'gzip, deflate');
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$headers = array();
$headers[] = 'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0';
$headers[] = 'Accept: application/json, text/plain, */*';
$headers[] = 'Accept-Language: en-US,en;q=0.5';
$headers[] = 'Content-Type: application/json;charset=utf-8';
$headers[] = 'Origin: https://dhcreator.dailyhunt.in';
$headers[] = 'Connection: keep-alive';
$headers[] = 'Referer: https://example.com/app/post/create?type=IMAGE';
$headers[] = "$cookie";
$headers[] = 'Sec-Fetch-Dest: empty';
$headers[] = 'Sec-Fetch-Mode: cors';
$headers[] = 'Sec-Fetch-Site: same-origin';
$headers[] = 'Te: trailers';
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$curl_result2 = curl_exec($ch); // Changed variable name here
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
curl_close($ch);
$json = json_decode($curl_result2, true);
$status = $json['data']['success'];
if($status){
$q = "UPDATE tbl_posts SET post_status = 0 WHERE pid = $pid";
$r = mysqli_query($mysqli,$q);
}
echo "OK ".$status;
}
sleep(10);
}
echo "I:".$i;
?>通过遵循以上建议，可以有效避免类似问题的发生，提高代码质量和开发效率。在编写复杂的循环逻辑时，务必保持警惕，仔细检查变量的使用情况，确保代码的正确性和健壮性。
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