SQL statement Error

Mysql

$query = "SELECT * from a where ' z ' = ' $url [query] ' limit 0,10 '; so write it Wrong Warning:mysql_fetch_array (): supplied argument is not A valid MySQL result resource in$query= "SELECT * from a where ' z ' = ' $url [query] '; but that's OK, why?

Reply to discussion (solution)

$query = "SELECT * from a where ' z ' = '". $url [' query ']. "' Limit 0,10 ';

Echo Mysql_error (); Look

I am also a rookie, but watching the PHP video of the Wisdom podcast learned this method of troubleshooting, first $query print (echo) out, and then put the results of this print into the MySQL black window to see if it can get results. If not, look at the error message, the appropriate modification.
See your error message, is the result set $res=mysql_query ($sql, $conn) did not obtain successfully.

Judging to see if there is a value

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