By default, function parameters are passed through values. if you want to allow a function to modify its parameter values, you can pass them by calling them. if you want a function parameter to be passed by reference, you can add the symbol (): functionfoo ($ bar) {$ bar before the parameter name in the pre-function definition. andsomethingextra .;} $ strThis is default, and function parameters are passed through values. if you want to allow a function to modify its parameter values, you can pass them by calling them.
If you want a function parameter to be passed through the reference, you can add the symbol (&) before the parameter name in the pre-function definition (&):
Function foo (& $ bar ){
$ Bar. = 'and something extra .';
}
$ Str = 'This is a string ,';
Foo ($ str );
Echo $ str; // output 'This is a string, and something extra .'
If you want to pass parameters to a function that is not defined in this way by calling, you can add the symbol (&) before the parameter name in the function call (&).
Function foo ($ bar ){
$ Bar. = 'and something extra .';
}
$ Str = 'This is a string ,';
Foo ($ str );
Echo $ str; // output 'This is a string ,'
Foo (& $ str );
Echo $ str; // output 'This is a string, and something extra .'
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