php不能在linux服务器上的mysql查询中使用撇号

我被一个奇怪的问题吓坏了。当我从phpmyadmin执行此查询时，它工作正常，并返回2个结果。但当我们执行这个查询表单php页面时，它返回0结果

$query = "SELECT distinct(vtiger_products.product_no) FROM `vtiger_products` 
    INNER JOIN vtiger_crmentity VC ON VC.crmid = vtiger_products.productid 
    inner join vtiger_tree_product vtp on vtiger_products.productid = vtp.productid"; 


$custom_conditions = '  cf.cf_1399 = "'.$_REQUEST['size'].'"';
$temp ='Where vtiger_products.hisotrization_status='Current' 
        AND vtiger_products.productid > 0 
        AND VC.deleted = 0 
        AND vtp.nodeid in (425,426,427,428,430,431,457,458,459,460,480,488,502,510,514,515,516,517,518,519,520,521,525,526,527,528,529)';

if ($custom_conditions) {
    $query .= " inner JOIN vtiger_productcf cf on cf.productid = vtiger_products.productid ";
    $conditions .= " AND ( " . str_replace('""','\""',str_replace("''","\''",$custom_conditions)) . " ) ";
}

$query = $query.$temp . $conditions; 






SELECT distinct(vtiger_products.product_no) FROM `vtiger_products` 
INNER JOIN vtiger_crmentity VC ON VC.crmid = vtiger_products.productid 
inner join vtiger_tree_product vtp on vtiger_products.productid = vtp.productid 
inner JOIN vtiger_productcf cf on cf.productid = vtiger_products.productid 
Where vtiger_products.hisotrization_status='Current' 
    AND vtiger_products.productid > 0 
    AND VC.deleted = 0 
    AND vtp.nodeid in (425,426,427,428,430,431,457,458,459,460,480,488,502,510,514,515,516,517,518,519,520,521,525,526,527,528,529) 
    AND ( cf.cf_1399 = "20'" );

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等待您的响应，谢谢

您可以使用函数mysql\u real\u escape\u strings将php变量传递到查询中，以在SQL语句中使用字符串中的特殊字符

e.g.mysql_real_escape_string($user);

简单明了：

错：

$query = '... set test = 'blah' where ...'; (' before blah terminates the string)

解决方案1：

$query = '... set test = \'blah\' where ...'; (escaping)

解决方案2：

$query = "... set test = 'blah' where ..."; (double quotes aren't terminated by single quotes)

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请注意，您好，$test！计算$test，同时计算“您好，$test！”没有。

您是否使用php中的变量来设置查询中的一个值？如果是这样，请同时发布PHP代码。请发布PHP文件中的整行内容，而不仅仅是SQL字符串。向我们展示您的PHP脚本查看您的帖子，vtiger_products是单间隔的这一事实意味着您使用了反勾号，而不是撇号如果查询在PHP字符串文字中，您需要转义用于分隔字符串的同一引号的任何用法。mysql_*函数已弃用。请输入mysqli_*equillents或PDO。