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<?php $lintCodeFx = function (string $code): ?string { $evalCode = 'if (time() === 1) {' // never true, but not evaluable on compile time . " ?>\n\n" . $code . "\n\n?><?php }"; echo $evalCode . "\n"; try { eval($evalCode); } catch (\Throwable $e) { return $e->getMessage(); } return null; }; var_dump($lintCodeFx('<?php class Foo{public $bar;}')); var_dump($lintCodeFx('<?php class Bar{public $bar; public $bar;}'));
Output for git.master, git.master_jit, rfc.property-hooks
if (time() === 1) { ?> <?php class Foo{public $bar;} ?><?php } NULL if (time() === 1) { ?> <?php class Bar{public $bar; public $bar;} ?><?php } Fatal error: Cannot redeclare Bar::$bar in /in/9NUjY(11) : eval()'d code on line 3
Process exited with code 255.

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