PHP Call By ReferenceIn case of PHP call by reference, actual value is modified if it is modified inside the function. In such case, you need to use & (ampersand) symbol with formal arguments. The & represents reference of the variable. Let's understand the concept of call by reference by the help of examples. Example 1In this example, variable $str is passed to the adder function where it is concatenated with 'Call By Reference' string. Here, printing $str variable results 'This is Call By Reference'. It is because changes are done in the actual variable $str. Output: This is Call By Reference Example 2Let's understand PHP call by reference concept through another example. Output: 11 Next TopicPHP Default Argument Values Function
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