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<?php $s = 'ab c1'; ++$s; var_dump($s); $s = '%'; ++$s; var_dump($s);
Output for git.master_jit, git.master
Deprecated: Increment on non-numeric string is deprecated, use str_increment() instead in /in/jtTtD on line 4 string(5) "ab c2" Deprecated: Increment on non-numeric string is deprecated, use str_increment() instead in /in/jtTtD on line 9 string(1) "%"

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