How to convert php object to string

How to convert PHP objects into strings: First create a new PHP file; then enter the code "echo json_encode($a);"; and finally run the "index.php" page in the browser.

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1. First, open the php editor and create a new php file. For example: index.php, fill in the basic code of the question.

2. In index.php, enter the code: echo json_encode($a);.

#3. The browser runs the index.php page. At this time, the A object is converted into a string and printed out.

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