Sample code for variable interaction between PHP and javascript

The following is an example of variable interaction between PHP and javascript. If you need a friend, you can refer to the following example for the interaction between PHP and javascript. The value in php is assigned to the js variable, provided that the php variable must have a value, even in a false branch.

For example, $ flags in php is true in this example. if the false statement in js is written as: $ title_1.innerHTML =" "; An error occurs because $ title is assigned as an array in php.

Although flags = "false"; $ title in php is a string, $ title is an array, and the array cannot be directly displayed in the string.
The code is as follows:
$ String = "heaven and earth ";
$ Flags = "";
If (strpbrk ($ string, "and ")! = False ){
$ Title = explode ("and", $ string );
$ Title_1 = $ title [0];
$ Title_2 = $ title [1];
$ Flags = "true ";
}
Else {
$ Title = $ string;
$ Flags = "false ";
}
?>

-> Html
The code is as follows: