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--TEST--
Passing assignments by reference
--FILE--
<?php
function f(&$a) {
var_dump($a);
$a = "a.changed";
}
echo "\n\n---> Pass constant assignment by reference:\n";
try {
f($a="a.original");
var_dump($a);
} catch (Throwable $e) {
echo "Exception: " . $e->getMessage() ."\n";
}
echo "\n\n---> Pass variable assignment by reference:\n";
try {
unset($a);
$a = "a.original";
f($b = $a);
var_dump($a);
} catch (Throwable $e) {
echo "Exception: " . $e->getMessage() ."\n";
}
echo "\n\n---> Pass reference assignment by reference:\n";
try {
unset($a, $b);
$a = "a.original";
f($b =& $a);
var_dump($a);
} catch (Throwable $e) {
echo "Exception: " . $e->getMessage() ."\n";
}
echo "\n\n---> Pass concat assignment by reference:\n";
try {
unset($a, $b);
$b = "b.original";
$a = "a.original";
f($b .= $a);
var_dump($a);
} catch (Throwable $e) {
echo "Exception: " . $e->getMessage() ."\n";
}
?>
--EXPECT--
---> Pass constant assignment by reference:
Exception: f(): Argument #1 ($a) cannot be passed by reference
---> Pass variable assignment by reference:
Exception: f(): Argument #1 ($a) cannot be passed by reference
---> Pass reference assignment by reference:
string(10) "a.original"
string(9) "a.changed"
---> Pass concat assignment by reference:
Exception: f(): Argument #1 ($a) cannot be passed by reference
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