[Solved] Fatal error: Call to undefined function boolval()

By Arun Basil Lal — on September 12, 2017 — 5 Comments ↓

boolval() is a PHP function that was introduced in PHP 5.5. If you try to use it on a server that runs PHP 5.4 and lower, you will get an error like this:

Fatal error: Call to undefined function boolval() in /path/to/file/file.php on line 12

To fix this error, add the following to your WordPress theme’s functions.php

/**
 * Get the boolean value of a variable
 *
 * @param 	mixed 	The scalar value being converted to a boolean.
 * @return 	boolean The boolean value of var.
 * @refer	http://php.net/manual/en/function.boolval.php#114013
 */
if( !function_exists('boolval')) {
  
  function boolval($var){
    return !! $var;
  }
}

Let me know if that helps.

Hello, I am Arun Basil Lal. Thank you for reading!

I am a WordPress product developer and creator of Image Attributes Pro. I am passionate about solving problems and travelling the world.

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5 Comments.

1. L. Scott Harrell says:

   January 23, 2019 at 05:14

   Thank you very much! This fix saved me time, money and a lot of aggravation. Cheers!

   Reply
   • Arun Basil Lal says:

     January 24, 2019 at 06:06

     Perfect. Glad to hear that Scott 🙂

     Reply
2. Rebecca says:

   April 21, 2019 at 01:37

   Thanks mate.
   This worked. Saved me hours of messing with around.

   Reply
3. Edgar Castillo Medina says:

   August 2, 2019 at 21:15

   Muchas gracias…funciono perfecto.
   Thanks a lot…a perfect solution!!!
   Regards from Mexico

   Reply
4. Joseph says:

   October 16, 2019 at 20:06

   Arun, the code you supplied worked perfectly and I had my site up and running again within seconds. Thank you so much as I appreciate your support. If there is anything I can do to spread the good word and help you, please let me know. Thank you again. -Joseph

   Reply