Error Identifier: print.nonString

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

$values = [1, 2, 3];
print $values;

Why is it reported? #

The argument passed to print cannot be converted to a string. In the example above, $values is an array, which does not have a __toString() method and cannot be implicitly converted to a string.

How to fix it #

Convert the value to a string before printing:

 <?php declare(strict_types = 1);
 
 $values = [1, 2, 3];
-print $values;
+print implode(', ', $values);

How to ignore this error #

You can use the identifier print.nonString to ignore this error using a comment:

// @phpstan-ignore print.nonString
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: print.nonString

Rules that report this error #

PHPStan\Rules\Cast\PrintRule [1]

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