Ποια είναι η διαφορά μεταξύ του τελεστή ανάθεσης '=' και του τελεστή σύγκρισης '=='?

= assigns a value to the variable. == compares the values for equality, and the types can be automatically converted.

<?php
$x = 5; // Assignment: the variable $x is assigned the value 5

if ($x == '5') { // Equality comparison of values: compares 5 (int) with '5' (string). Types are converted, the condition is true.
    echo "Values are equal";
}
?>