How Can I Fix PHP 5.4\'s \'Call-time Pass-by-Reference\' Error?

Fixing PHP 5.4's Call-Time Pass-by-Reference Error

The PHP 5.4 error "Call-time pass-by-reference has been removed" can be frustrating, especially if the affected legacy code is extensive. However, the solution to this issue is straightforward.

Understanding the Error

The error occurs when functions are called with arguments that are passed by reference using the "&" symbol in the wrong location. Instead of denoting the reference in the function call, it should be defined in the function definition.

The Correction

To resolve the error, remove the "&" symbol from the function call and add it to the function definition. This ensures that the argument is passed by reference correctly.

For instance, revise the following code:

// Wrong way!
myFunc(&$arg);                # Deprecated pass-by-reference argument
function myFunc($arg) { }

To this corrected version:

// Right way!
myFunc($var);                   # pass-by-value argument
function myFunc(&$arg) { }

According to the PHP documentation, "call-time pass-by-reference" was deprecated in version 5.3 and completely removed in 5.4. Therefore, it is advisable to rewrite the legacy code to avoid this error in the future.

By implementing these corrections, developers can easily resolve the PHP 5.4 "Call-time pass-by-reference" error and ensure the proper functioning of their code.

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