echo.nonString

Code example

<?php declare(strict_types = 1);

function doFoo(): void
{
	echo [];
}

Why is it reported?

The echo language construct expects values that can be converted to a string. Passing a value that cannot be converted to a string -- such as an array or an object without a __toString() method -- will cause a TypeError at runtime. In the example above, an array is passed to echo, which PHP cannot convert to a string.

How to fix it

Convert the value to a string before passing it to echo:

 <?php declare(strict_types = 1);

 function doFoo(): void
 {
-	echo [];
+	echo implode(', ', []);
 }

Or use a function designed for the value type:

 <?php declare(strict_types = 1);

 function doFoo(): void
 {
-	echo [];
+	print_r([]);
 }