php - 注意：数组转换为字符串

Question

I am trying to compose a SQL query via php. But I get the notice mentioned in a pretty unusual way.

$i=0;
$SQL="";
$tableFieldsQueryFormat=array("hospitals"=>"(location LIKE '%@val%' OR phone_no LIKE '%@val%')","doctors"=>"doc_name LIKE '%@val%'","news"=>"title LIKE '%@val%'","diseases"=>"name LIKE '%@val%'","tips"=>"tip LIKE '%@val%'");
$tableName=array("hospitals","doctors","news","diseases","tips");
$query_str=str_replace("@val",trim("dummy"),$tableFieldsQueryFormat[$tableName[$i]]);
$SQL="SELECT * FROM $tableName WHERE $query_str AND isdeleted='0';"; // Notice is thrown here !!!

I have not treated the '$SQL' variable as an array in any part of the program, in fact I only declared and used it in the above snippet. What could be the reason behind this weird notice? I don't think I've made any syntax or logic errors.

Answer 1

You are seeing this exception because $tableName is an array. When your string is being interpolated $tableName can not be converted to a string.

Try this instead:

$SQL = "SELECT * FROM " . explode(",",$tableName) . " WHERE $query_str AND isdeleted='0';";