[Closure Source] Get Closure source code. #tags: PHP, reflection, source

closure_source.php

<?php

function closure_source(Closure $c) {
  $rfx = new ReflectionFunction($c); $args = [];
  foreach($rfx->getParameters() as $p)
    $args[] = ($p->isArray() ? 'array ' : ($p->getClass() ? $p->getClass()->name . ' ' : ''))
       . ($p->isPassedByReference() ? '&' : '') . '$' . $p->name
       . ($p->isOptional() ? ' = ' . var_export($p->getDefaultValue(), true) : '');
  return 'function(' . implode(',', $args) . "){\n"
         . implode('',array_slice(file($rfx->getFileName()),
            $s=$rfx->getStartLine(),$rfx->getEndLine()-$s-1)).'}';
}

Approach is good but it wont work with closure_source(function() {echo 'one liner test';});