What common SQL syntax error is highlighted in the forum thread regarding PHP usage?

The common SQL syntax error highlighted in the forum thread is the incorrect usage of single quotes in the SQL query string. When concatenating variables into the query, it's important to use double quotes to ensure that the variables are properly interpolated. This can lead to errors such as "Unknown column 'variable' in 'where clause'". 

// Incorrect SQL query with single quotes
$sql = "SELECT * FROM table WHERE column = '$variable'";

// Correct SQL query with double quotes
$sql = "SELECT * FROM table WHERE column = \"$variable\"";

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SQL syntax error PHP usage forum thread common error highlighted.

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