MYSQL variable In php query -

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i trying query multiple mysql statement in 1 query failed. 

$testq ="";         $testq .= mysql_query("set @@group_concat_max_len = 5000");         $testq .= mysql_query("set @sql = null");         $testq .= mysql_query("select   group_concat(distinct                     concat(                       'max(if(property_name = ''',                       property_name,                       ''', value, null)) ',                       property_name                     )                   ) @sql properties");         $testq .= mysql_query("set @sql = concat('select item_id, ', @sql, ' properties group item_id')");         $testq .= mysql_query("prepare stmt @sql");         $testq .= mysql_query("execute stmt");          $da = mysql_query($testq, $dbconnect);                   while($rt = mysql_fetch_assoc($da){             //print              }

error is: warning: mysql_fetch_assoc() expects parameter 1 resource, boolean given in c:\users.....on line 24 how can query , print result in table?

the mysql extension in php not support multi queries in php security reasons mysql_query. should not use mysql anymore furthermore, use mysqli.

you should use union or concat queries. if want make multi query, should use mysqli_multi_query within mysqli library.

then syntax have another. queries have submitted 1 string in 1 function this:

$mysqli->multi_query("select * table; truncate table; drop table;");

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