(PECL runkit >= 0.8.0)
runkit_return_value_used — Determines if the current functions return value will be used
bool runkit_return_value_used ( void )
Returns TRUE if the function's return value is used by the calling scope, otherwise FALSE
Example #1 runkit_return_value_used() example
<?php
function foo() {
var_dump(runkit_return_value_used());
}
foo();
$f = foo();
?> The above example will output:
bool(false) bool(true)
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https://secure.php.net/manual/en/function.runkit-return-value-used.php