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<?php $before = 'I have 10000 dollars.'; $expect = 'I have 10,000 dollars.'; $result = preg_replace_callback( '/\d+/', function($number) { return number_format($number[0]); }, $before ); var_dump($result === $expect); echo $result;
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) I have 10,000 dollars.

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