"php: different quotes?" Answer’s

0

Variable-substitution isn't done when using single quotes ('), meaning that the values in your first example would literally be $1 $2 etc if it was a regular string and not passed on to a function that replaces them.

If you don't need variable-substitiution, it's better to stick with single quotes for performance reasons.

`` invokes the shell-engine and invokes it as an actual command, and returning the result, just like in perl. Hence, it has a completely different meaning.

examples:

$email = 'user@example.org';
$sql1 = "SELECT user_id FROM users WHERE email = $email";
$sql2 = 'SELECT user_id FROM users WHERE email = $email';

$sql1 would be SELECT user_id FROM users WHERE email = user@example.org

$sql2 would be SELECT user_id FROM users WHERE email = $email

Wednesday, March 31, 2021
 
shin
answered 10 Months ago
Only authorized users can answer the question. Please sign in first, or register a free account.
Not the answer you're looking for? Browse other questions tagged :