De-Obfuscate PHP code

Purchased a PHP script some years back for one of my websites. Works fine but there are some bugs that need fixing. The original author of this script is Missing-In-Action and no one has seen or heard from him in over 2 years. I could fix it myself but the code is obfuscated in some way. I only need the file De-obfuscated. I will tell you what it is not. It is not Zend-encoded It is not ION-cube encoded It does not use the eval function. The file is 431 lines long, and only 46kb in size. I have attached it in the project. The PHP file is a mixture of plain HTML and this obfuscated code. A sample of the code... while (strpos($ghN5dgMlK52NndhRRrozT,"[[") >= 1) { $bULdgDBlmaGSf7l0KHmoK = cVt5eg6nFIedeXrBdOOCT($ghN5dgMlK52NndhRRrozT); $aEi69gIJO_ktlHscVDDtt = Jts5fgOdam7oCGpbh7lpI(substr($ghN5dgMlK52NndhRRrozT,($bULdgDBlmaGSf7l0KHmoK[1]),($bULdgDBlmaGSf7l0KHmoK[0]-$bULdgDBlmaGSf7l0KHmoK[1]))); $ghN5dgMlK52NndhRRrozT = substr($ghN5dgMlK52NndhRRrozT,0,$bULdgDBlmaGSf7l0KHmoK[1]) . $aEi69gIJO_ktlHscVDDtt . substr($ghN5dgMlK52NndhRRrozT,$bULdgDBlmaGSf7l0KHmoK[0]); } return $ghN5dgMlK52NndhRRrozT; } function VOK24gTocJNCe295UpBoZ($ktH6egkB_2kJRZ2kBb5qD) { $ktH6egkB_2kJRZ2kBb5qD = FALSE; $abd71gANhXzD6PFS_KBaq = floatval(phpversion()); if ($abd71gANhXzD6PFS_KBaq >= 5) { $ktH6egkB_2kJRZ2kBb5qD = TRUE; } else { $ktH6egkB_2kJRZ2kBb5qD = FALSE; } return $ktH6egkB_2kJRZ2kBb5qD; } function search2post_add_template_stylesheet($RZR1egIdEh5DPYM5_DiRH) {