Error Identifier: impure.betweenPhpTags

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);

/** @phpstan-pure */
function doFoo(): int
{
	?><p>Hello</p><?php
	return 1;
}

Why is it reported? #

A function marked as @phpstan-pure contains HTML output between PHP opening and closing tags. Pure functions must not have side effects, and outputting HTML to the browser is a side effect.

How to fix it #

Remove the HTML output from the pure function:

 <?php declare(strict_types = 1);
 
 /** @phpstan-pure */
 function doFoo(): int
 {
-	?><p>Hello</p><?php
- 	return 1;
 }

Or remove the @phpstan-pure annotation if the function intentionally produces output.

How to ignore this error #

You can use the identifier impure.betweenPhpTags to ignore this error using a comment:

// @phpstan-ignore impure.betweenPhpTags
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: impure.betweenPhpTags

Rules that report this error #

PHPStan\Rules\Pure\PureFunctionRule [1]
PHPStan\Rules\Pure\PureMethodRule [1]

Edit this page on GitHub

Theme