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$a = "time:" . time();   //$a       ->  zend_string_1(refcount=1)
$b = $a;                 //$a,$b    ->  zend_string_1(refcount=2)
$c = $b;                 //$a,$b,$c ->  zend_string_1(refcount=3)

unset($b);               //$b = IS_UNDEF  $a,$c ->  zend_string_1(refcount=2)

<?php
$a = "time:" . time();   //$a       ->  zend_string_1(refcount=1)
debug_zval_dump($a);
$b = $a;                 //$a,$b    ->  zend_string_1(refcount=2)
$c = $b;                 //$a,$b,$c ->  zend_string_1(refcount=3)
debug_zval_dump($a);

unset($b);               //$b = IS_UNDEF  $a,$c ->  zend_string_1(refcount=2)

debug_zval_dump($a);

string(15) "time:1629940681" refcount(2)
string(15) "time:1629940681" refcount(4)
string(15) "time:1629940681" refcount(3)