The trace function is used to identify and follow data flow in PHP. It helps in debugging by allowing you to track the value of a variable at different points in your code. By using trace($a), you can detect the data flow and pinpoint issues.
In this example, the trace function is defined to print the value of a variable in a readable format. The function is used to trace the value of $a at different points in the code, helping you to understand how the data changes and to identify potential issues
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