Fatal Error: Cannot redeclare function() in render.php about gutenberg

[fabiankaegy]

This is a fundamental limitation with what the render.php file is. The file, or rather whatever file you include via the render key in block.json gets used as the render_callback of a block. This render callback will be called multiple times during a WordPress render cycle.

Because of this this file may not contain any function definitions. Or if it does contain them they need to be guarded with the functions_exist check before defining it.

A better option is moving the function definition into another file in the theme or plugin and then only calling it from within the render file

[cb911nr]

Thanks for that @fabiankaegy

Hate to bother but considering my ignorance in this, how would I place that function somewhere to be used inside render.php correctly?

Right now it's a plugin, structure is the typical create-block structure with, so there's on main php file for the plugin that register_block_type everything, but when I put the function in here, render.php doesn't see it?

Assume placing it inside functions.php at the theme level would solve it but rather keep it at the plugin level.

[fabiankaegy]

The create block cli creates a main PHP file named after the project slug in the root of the plugin folder. This file contains the plugin header metadata and the {{namespaceSnakeCase}}_{{slugSnakeCase}}_block_init function.

If you define your custom function there that should make it accessible in your render.php

[cb911nr]

Ah thank you that worked, I guess I had to enable / disable the plugin or something funky.