How can the use of "function_exists()" in PHP scripts help in managing function definitions and ensuring code efficiency?

Using "function_exists()" in PHP scripts can help in managing function definitions by checking if a function has already been defined before redefining it. This can prevent errors and conflicts that may arise from defining the same function multiple times. Additionally, it can help ensure code efficiency by avoiding unnecessary function redeclarations and improving overall script performance. 

if (!function_exists('myFunction')) {
    function myFunction() {
        // Function implementation
    }
}

Keywords

function_exists PHP scripts function definitions code efficiency managing

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