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19 years ago
Functions created by create_function() cannot return a value by reference.  The function below creates a function that can.  The arguments are the same as create_function().  Note that these arguments are passed, unmodified, to eval(), so be sure that data passed in is sanitized.

<?php
/** 
 * create_ref_function
 * Create an anonymous (lambda-style) function
 * which returns a reference
 * see http://php.net/create_function
 */
function
create_ref_function( $args, $code )
{
    static $n = 0;

    $functionName = sprintf('ref_lambda_%d',++$n);
    
    $declaration = sprintf('function &%s(%s) {%s}',$functionName,$args,$body);
    
    eval($declaration);
    
    return $functionName;
}
?>
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