How to Redefine and Rename PHP Functions?

PHP Function Redefinition and Renaming

In PHP, functions cannot be redefined by simply rewriting them. Attempting to do so, as shown below, will result in an error:

<code class="php">function this($a){
   return $a;
}

function this($a, $b){  //New this function
   return $a * $b;
}</code>

Error:

Fatal error: Cannot redeclare foo()

To redefine or rename a function in PHP, you can use the runkit extension. It provides functions such as runkit_function_rename() and runkit_function_redefine().

For example, to rename the this function to another, you can use runkit_function_rename():

<code class="php">runkit_function_rename('this', 'another');</code>

To redefine the this function such that it takes two arguments and multiplies them, you can use runkit_function_redefine():

<code class="php">runkit_function_redefine('this', '$a, $b', '$a * $b');</code>

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