PHP overload “=” operator

问题

Is there a way to overload the equals operator?

Let's say I have this code:

$variable1 = "a";
$variable1 = "c";

I would like to save to a log file everytime i assign something to $variable1 without having to do something like:

$variable1 = "a";
add_to_some_logfile("a");

$variable1 = "c";
add_to_some_logfile("c");

Is there a way to override the equals operator in order to do some other operation other than just assigning the value to the variable?

回答1:

No. PHP doesn't support operator overloading, with a few exceptions (as noted by @NikiC: "PHP supports overloading of some operators, like [], -> and (string) and also allows overloading some language constructs like foreach").Piskvor

php overload = operator

but in http://pecl.php.net/package/operator is a php extension that Operator overloading for: +, -, *, /, %, <<, >>, ., |, &, ^, ~, !, ++, --, +=, -=, *=, /=, %=, <<=, >>=, .=, |=, &=, ^=, ~=, ==, !=, ===, !==, <, and <= operators. Conditional support for > and >= available with application of a patch.

来源：https://stackoverflow.com/questions/15953591/php-overload-operator