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Prepared statement issue


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After deciding to venture into the realm of prepared statements, I have this line in my script


if ($stmt = $conn->prepare('SELECT username FROM users WHERE username = ?')) {

Everything was working fine. 

I reviewed my code to adjust it to my old habits, and realized that I had hardcoded the TABLE NAME rather than using a variable.

I updated my code to


$table = "users";

if ($stmt = $conn->prepare('SELECT username FROM $table WHERE username = ?')) {

and results from my SELECT statement vanished.

Is the use of a variable for a table's name outdated? Even possible??

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