Reference operator(&) introduced in php 4.0 version.
Why we need reference operator ?
Consider this is the scenario,
We have variable a and b. Variable a value assigned to variable b. If we are changing the variable a value frequently after the value assignment to variable b, it will not be reflected.
To overcome the above issue reference operator introduced in php.
Sample PHP Program: [without Reference operator]
<?php $a = 5; $b = $a; $a = 10; echo $b; ?>
Here we have assigned a variable a value to variable b. But after the assignment variable a value has been changed from 5 to 10. But if you print b variable, we are getting the old assigned value (5) only.
Now the above issue has been resolved using the reference operator in php,
Sample PHP program: [with Reference operator]:
<?php $a = 5; $b = &$a; $a = 10; echo $b; ?>
Here whenever the variable value a changes it affects automatically to the already assigned variable b too.
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